552 lines
19 KiB
Text
552 lines
19 KiB
Text
# Radar2 and RWR routines.
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# Alexis Bory (xiii)
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# Every 0.05 seconde:
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# [1] Generates a sweep scan pattern and when sweep direction changes, scans
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# /AI/models for (aircrafts), (carriers), multiplayers. Creates a list of
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# these targets, whenever they are in radar overall range and are valid.
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# [2] RWR (Radar Warning Receiver) signals are then computed. RWR is included
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# within the radar stuff to avoid redundancy.
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# [3] At each loop the targets list is scanned and each target bearing is checked
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# against the radar beam heading. If the target is within the radar beam, its
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# display properties are updated. Two different displays are possible:
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# B-scan like and PPI like.
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# The target distance is then scored so the radar system can autotrack the
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# nearest target.
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# Every 0.1 seconde:
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# [4] Computes HUD marker position and closure rate for the nearest target.
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var ElapsedSec = props.globals.getNode("sim/time/elapsed-sec");
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var DisplayRdr = props.globals.getNode("instrumentation/radar/display-rdr");
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var AzField = props.globals.getNode("instrumentation/radar/az-field");
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var RangeSelected = props.globals.getNode("instrumentation/radar/range-selected");
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var RadarStandby = props.globals.getNode("instrumentation/radar/radar-standby");
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var RadarStandbyMP = props.globals.getNode("sim/multiplay/generic/int[2]");
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var SwpMarker = props.globals.getNode("instrumentation/radar2/sweep-marker-norm", 1);
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var SwpDisplayWidth = props.globals.getNode("instrumentation/radar2/sweep-width-m");
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var RngDisplayWidth = props.globals.getNode("instrumentation/radar2/range-width-m");
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var PpiDisplayRadius = props.globals.getNode("instrumentation/radar2/radius-ppi-display-m");
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var HudEyeDist = props.globals.getNode("instrumentation/radar2/hud-eye-dist-m");
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var HudRadius = props.globals.getNode("instrumentation/radar2/hud-radius-m");
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var HudTgtHDisplay = props.globals.getNode("instrumentation/radar2/hud/target-display", 1);
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var HudTgt = props.globals.getNode("instrumentation/radar2/hud/target", 1);
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var HudTgtTDev = props.globals.getNode("instrumentation/radar2/hud/target-total-deviation", 1);
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var HudTgtTDeg = props.globals.getNode("instrumentation/radar2/hud/target-total-angle", 1);
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var HudTgtClosureRate = props.globals.getNode("instrumentation/radar2/hud/closure-rate", 1);
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var OurAlt = props.globals.getNode("position/altitude-ft");
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var OurHdg = props.globals.getNode("orientation/heading-deg");
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var OurRoll = props.globals.getNode("orientation/roll-deg");
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var OurPitch = props.globals.getNode("orientation/pitch-deg");
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var EcmOn = props.globals.getNode("instrumentation/ecm/on-off", 1);
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var EcmAlert1 = props.globals.getNode("instrumentation/ecm/alert-type1", 1);
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var EcmAlert2 = props.globals.getNode("instrumentation/ecm/alert-type2", 1);
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var az_fld = AzField.getValue();
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var l_az_fld = 0;
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var r_az_fld = 0;
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var swp_marker = nil; # Scan azimuth deviation, normalized (-1 --> 1).
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var swp_deg = nil; # Scan azimuth deviation, in degree.
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var swp_deg_last = 0; # Used to get sweep direction.
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var swp_spd = 1.7;
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var swp_dir = nil; # Sweep direction, 0 to left, 1 to right.
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var swp_dir_last = 0;
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var swp_diplay_width = SwpDisplayWidth.getValue(); # Length of the max azimuth range on the screen.
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# used for the B-scan display and sweep markers.
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var rng_diplay_width = SwpDisplayWidth.getValue(); # Length of the max range vertical width on the
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# screen. used for the B-scan display.
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var ppi_diplay_radius = PpiDisplayRadius.getValue(); # Length of the radial size
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# of the PPI like display.
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var hud_eye_dist = HudEyeDist.getValue(); # Distance eye <-> HUD plane.
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var hud_radius = HudRadius.getValue(); # Used to clamp the nearest target marker.
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var range_radar2 = 0;
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var my_radarcorr = 0;
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var wcs_mode = "rws"; #FIXME should handled as properties choice, not harcoded.
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var tmp_nearest_rng = nil;
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var tmp_nearest_u = nil;
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var nearest_rng = 0;
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var nearest_u = nil;
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var our_true_heading = 0;
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var our_alt = 0;
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var Mp = props.globals.getNode("ai/models");
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var tgts_list = [];
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var cnt = 0; # Counter used for the scan sweep pattern
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var cnt_hud = 0; # Counter used for the HUD update
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# ECM warnings.
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var ecm_alert1 = 0;
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var ecm_alert2 = 0;
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var ecm_alert1_last = 0;
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var ecm_alert2_last = 0;
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var u_ecm_signal = 0;
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var u_ecm_signal_norm = 0;
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var u_radar_standby = 0;
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var u_ecm_type_num = 0;
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init = func() {
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var our_ac_name = getprop("sim/aircraft");
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radardist.init();
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my_radarcorr = radardist.my_maxrange( our_ac_name ); # Kilometers
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settimer(rdr_loop, 0.5);
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}
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# Main loop ###############
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var rdr_loop = func() {
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var display_rdr = DisplayRdr.getBoolValue();
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if ( display_rdr ) {
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az_scan();
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} elsif ( size(tgts_list) > 0 ) {
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foreach( u; tgts_list ) {
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u.set_display(0);
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}
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}
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if (cnt_hud == 0.1) {
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RadarStandbyMP.setIntValue(RadarStandby.getValue()); # Tell over MP if
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# our radar is scaning or is in stanby.
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hud_nearest_tgt();
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cnt_hud = 0;
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} else {
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cnt_hud += 0.05;
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}
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settimer(rdr_loop, 0.05);
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}
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var az_scan = func() {
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# Antena az scan.
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var fld_frac = az_fld / 120;
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var fswp_spd = swp_spd / fld_frac;
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swp_marker = math.sin(cnt * fswp_spd) * fld_frac;
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SwpMarker.setValue(swp_marker);
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swp_deg = az_fld / 2 * swp_marker;
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swp_dir = swp_deg < swp_deg_last ? 0 : 1;
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if ( az_fld == nil ) { az_fld = 74 }
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l_az_fld = - az_fld / 2;
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r_az_fld = az_fld / 2;
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var fading_speed = 0.015;
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our_true_heading = OurHdg.getValue();
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our_alt = OurAlt.getValue();
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if (swp_dir != swp_dir_last) {
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# Antena scan direction change. Max every 2 seconds. Reads the whole MP_list.
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# TODO: Transient move for the sweep marker when changing az scan field.
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az_fld = AzField.getValue();
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range_radar2 = RangeSelected.getValue();
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if ( range_radar2 == 0 ) { range_radar2 = 0.00000001 }
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# Reset nearest_range score
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nearest_u = tmp_nearest_u;
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nearest_rng = tmp_nearest_rng;
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tmp_nearest_rng = nil;
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tmp_nearest_u = nil;
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tgts_list = [];
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var raw_list = Mp.getChildren();
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foreach( var c; raw_list ) {
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# FIXME: At that time a multiplayer node may have been deleted while still
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# existing as a displayable target in the radar targets nodes.
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var type = c.getName();
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if (!c.getNode("valid", 1).getValue()) {
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continue;
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}
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var HaveRadarNode = c.getNode("radar");
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if (type == "multiplayer" or type == "tanker" and HaveRadarNode != nil) {
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var u = Target.new(c);
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u_ecm_signal = 0;
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u_ecm_signal_norm = 0;
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u_radar_standby = 0;
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u_ecm_type_num = 0;
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if ( u.Range != nil) {
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var u_rng = u.get_range();
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if (u_rng < range_radar2 ) {
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u.get_deviation(our_true_heading);
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if ( u.deviation > l_az_fld and u.deviation < r_az_fld ) {
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append(tgts_list, u);
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} else {
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u.set_display(0);
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}
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} else {
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u.set_display(0);
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}
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ecm_on = EcmOn.getBoolValue();
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# Test if target has a radar. Compute if we are illuminated. This propery used by ECM
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# over MP, should be standardized, like "ai/models/multiplayer[0]/radar/radar-standby".
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if ( ecm_on) {
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rwr(u); # TODO: override display when alert.
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}
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}
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}
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}
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# Summarize ECM alerts.
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if ( ecm_alert1 == 0 and ecm_alert1_last == 0 ) { EcmAlert1.setBoolValue(0) }
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if ( ecm_alert2 == 0 and ecm_alert1_last == 0 ) { EcmAlert2.setBoolValue(0) }
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ecm_alert1_last = ecm_alert1; # And avoid alert blinking at each loop.
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ecm_alert2_last = ecm_alert2;
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ecm_alert1 = 0;
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ecm_alert2 = 0;
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}
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foreach( u; tgts_list ) {
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var u_display = 0;
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var u_fading = u.get_fading() - fading_speed;
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if ( u_fading < 0 ) { u_fading = 0 }
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if (( swp_dir and swp_deg_last < u.deviation and u.deviation <= swp_deg )
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or ( ! swp_dir and swp_deg <= u.deviation and u.deviation < swp_deg_last )) {
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u.get_bearing();
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u.get_heading();
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var horizon = u.get_horizon( our_alt );
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var u_rng = u.get_range();
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if ( u_rng < horizon and radardist.radis(u.string, my_radarcorr)) {
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# Compute mp position in our B-scan like display. (Bearing/horizontal + Range/Vertical).
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u.set_relative_bearing( swp_diplay_width / az_fld * u.deviation );
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var factor_range_radar = rng_diplay_width / range_radar2; # Length of the distance range on the B-scan screen.
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u.set_ddd_draw_range_nm( factor_range_radar * u_rng );
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u_fading = 1;
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u_display = 1;
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# Compute mp position in our PPI like display.
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factor_range_radar = ppi_diplay_radius / range_radar2; # Length of the radius range on the PPI like screen.
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u.set_tid_draw_range_nm( factor_range_radar * u_rng );
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# Compute first digit of mp altitude rounded to nearest thousand. (labels).
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u.set_rounded_alt( rounding1000( u.get_altitude() ) / 1000 );
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# Compute closure rate in Kts.
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u.get_closure_rate();
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# Check if u = nearest echo.
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if ( tmp_nearest_rng == nil or u_rng < tmp_nearest_rng) {
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tmp_nearest_u = u;
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tmp_nearest_rng = u_rng;
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}
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}
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u.set_display(u_display);
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}
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u.set_fading(u_fading);
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}
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swp_deg_last = swp_deg;
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swp_dir_last = swp_dir;
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cnt += 0.05;
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}
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var hud_nearest_tgt = func() {
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# Computes nearest_u position in the HUD
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if ( nearest_u != nil ) {
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if ( wcs_mode == "tws-auto" and nearest_u.get_display() and nearest_u.deviation > l_az_fld and nearest_u.deviation < r_az_fld ) {
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var u_target = nearest_u.type ~ "[" ~ nearest_u.index ~ "]";
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var our_pitch = OurPitch.getValue();
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var u_dev_rad = (90 - nearest_u.get_deviation(our_true_heading)) * D2R;
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var u_elev_rad = (90 - nearest_u.get_total_elevation(our_pitch)) * D2R;
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# Deviation length on the HUD (at level flight), 0.6686m = distance eye <-> virtual HUD screen.
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var h_dev = 0.6686 / ( math.sin(u_dev_rad) / math.cos(u_dev_rad) );
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var v_dev = 0.6686 / ( math.sin(u_elev_rad) / math.cos(u_elev_rad) );
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# Angle between HUD center/top <-> HUD center/target position.
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# -90° left, 0° up, 90° right, +/- 180° down.
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var dev_deg = math.atan2( h_dev, v_dev ) * R2D;
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# Correction with own a/c roll.
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var combined_dev_deg = dev_deg - OurRoll.getValue();
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# Lenght HUD center <-> target pos on the HUD:
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var combined_dev_length = math.sqrt((h_dev*h_dev)+(v_dev*v_dev));
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# Clamp so the target follow the HUD limits.
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if ( combined_dev_length > hud_radius ) {
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combined_dev_length = hud_radius;
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Clamp_Blinker.blink();
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} else {
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Clamp_Blinker.cont();
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}
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# Clamp closure rate from -200 to +1,000 Kts.
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var cr = nearest_u.ClosureRate.getValue();
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if (cr < -200) { cr = 200 } elsif (cr > 1000) { cr = 1000 }
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HudTgtClosureRate.setValue(cr);
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HudTgtTDeg.setValue(combined_dev_deg);
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HudTgtTDev.setValue(combined_dev_length);
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HudTgtHDisplay.setBoolValue(1);
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HudTgt.setValue(u_target);
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return;
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}
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}
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HudTgtClosureRate.setValue(0);
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HudTgtTDeg.setValue(0);
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HudTgtTDev.setValue(0);
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HudTgtHDisplay.setBoolValue(0);
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}
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# HUD clamped target blinker
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Clamp_Blinker = aircraft.light.new("instrumentation/radar2/hud/target-clamped-blinker", [0.1, 0.1]);
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setprop("instrumentation/radar2/hud/target-clamped-blinker/enabled", 1);
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# ECM: Radar Warning Receiver
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rwr = func(u) {
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var u_name = radardist.get_aircraft_name(u.string);
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var u_maxrange = radardist.my_maxrange(u_name); # in kilometer, 0 is unknown or no radar.
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var horizon = u.get_horizon( our_alt );
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var u_rng = u.get_range();
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var u_carrier = u.check_carrier_type();
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if ( u.get_rdr_standby() == 0 and u_maxrange > 0 and u_rng < horizon ) {
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# Test if we are in its radar field (hard coded 74°) or if we have a MPcarrier.
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# Compute the signal strength.
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var our_deviation_deg = deviation_normdeg(u.get_heading(), u.get_reciprocal_bearing());
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if ( our_deviation_deg < 0 ) { our_deviation_deg *= -1 }
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if ( our_deviation_deg < 37 or u_carrier == 1 ) {
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u_ecm_signal = (((-our_deviation_deg/20)+2.5)*(!u_carrier )) + (-u_rng/20) + 2.6 + (u_carrier*1.8);
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u_ecm_type_num = radardist.get_ecm_type_num(u_name);
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}
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} else {
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u_ecm_signal = 0;
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}
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# Compute global threat situation for undiscriminant warning lights
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# and discrete (normalized) definition of threat strength.
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if ( u_ecm_signal > 1 and u_ecm_signal < 3 ) {
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EcmAlert1.setBoolValue(1);
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ecm_alert1 = 1;
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u_ecm_signal_norm = 2;
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} elsif ( u_ecm_signal >= 3 ) {
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EcmAlert2.setBoolValue(1);
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ecm_alert2 = 1;
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u_ecm_signal_norm = 1;
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}
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u.EcmSignal.setValue(u_ecm_signal);
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u.EcmSignalNorm.setIntValue(u_ecm_signal_norm);
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u.EcmTypeNum.setIntValue(u_ecm_type_num);
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}
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# Utilities.
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var deviation_normdeg = func(our_heading, target_bearing) {
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var dev_norm = our_heading - target_bearing;
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while (dev_norm < -180) dev_norm += 360;
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while (dev_norm > 180) dev_norm -= 360;
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return(dev_norm);
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}
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var rounding1000 = func(n) {
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var a = int( n / 1000 );
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var l = ( a + 0.5 ) * 1000;
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n = (n >= l) ? ((a + 1) * 1000) : (a * 1000);
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return( n );
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}
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# Controls
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var radar_range_control = func(n) {
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# FIXME: Radar props should provide their own ranges instead of being hardcoded.
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# 5, 10, 20, 50, 100, 200
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var range_radar = RangeSelected.getValue();
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if ( n == 1 ) {
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if ( range_radar == 5 ) {
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range_radar = 10;
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} elsif ( range_radar == 10 ) {
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range_radar = 20;
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} elsif ( range_radar == 20 ) {
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range_radar = 50;
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} elsif ( range_radar == 50 ) {
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range_radar = 100;
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} else {
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range_radar = 150;
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}
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} else {
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if ( range_radar == 150 ) {
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range_radar = 100;
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} elsif ( range_radar == 100 ) {
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range_radar = 50;
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} elsif ( range_radar == 50 ) {
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range_radar = 20;
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} elsif ( range_radar == 20 ) {
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range_radar = 10;
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} else {
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range_radar = 5;
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}
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}
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RangeSelected.setValue(range_radar);
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}
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radar_mode_sel = func(mode) {
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# FIXME: Modes props should provide their own data instead of being hardcoded.
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foreach (var n; props.globals.getNode("instrumentation/radar/mode").getChildren()) {
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n.setBoolValue(n.getName() == mode);
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wcs_mode = mode;
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}
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if ( wcs_mode == "rws" ) {
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AzField.setValue(120);
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swp_diplay_width = 0.0844;
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} else {
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AzField.setValue(60);
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swp_diplay_width = 0.0422;
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}
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}
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radar_mode_toggle = func() {
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# FIXME: Modes props should provide their own data instead of being hardcoded.
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# Toggles between the available modes.
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foreach (var n; props.globals.getNode("instrumentation/radar/mode").getChildren()) {
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if ( n.getBoolValue() ) { wcs_mode = n.getName() }
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}
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if ( wcs_mode == "rws" ) {
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setprop("instrumentation/radar/mode/rws", 0);
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setprop("instrumentation/radar/mode/tws-auto", 1);
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wcs_mode = "tws-auto";
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AzField.setValue(60);
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swp_diplay_width = 0.0422;
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} elsif ( wcs_mode == "tws-auto" ) {
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setprop("instrumentation/radar/mode/tws-auto", 0);
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setprop("instrumentation/radar/mode/rws", 1);
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wcs_mode = "pulse-srch";
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AzField.setValue(120);
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swp_diplay_width = 0.0844;
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}
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}
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setlistener("sim/signals/fdm-initialized", init);
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# Target class
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var Target = {
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new : func (c) {
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var obj = { parents : [Target]};
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obj.RdrProp = c.getNode("radar");
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obj.Heading = c.getNode("orientation/true-heading-deg");
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obj.Alt = c.getNode("position/altitude-ft");
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obj.AcType = c.getNode("sim/model/ac-type");
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obj.type = c.getName();
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obj.index = c.getIndex();
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obj.string = "ai/models/" ~ obj.type ~ "[" ~ obj.index ~ "]";
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obj.shortstring = obj.type ~ "[" ~ obj.index ~ "]";
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obj.InstrTgts = props.globals.getNode("instrumentation/radar2/targets", 1);
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obj.TgtsFiles = obj.InstrTgts.getNode(obj.shortstring, 1);
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obj.Range = obj.RdrProp.getNode("range-nm");
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obj.Bearing = obj.RdrProp.getNode("bearing-deg");
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obj.Elevation = obj.RdrProp.getNode("elevation-deg");
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obj.BBearing = obj.TgtsFiles.getNode("bearing-deg", 1);
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obj.BHeading = obj.TgtsFiles.getNode("true-heading-deg", 1);
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obj.RangeScore = obj.TgtsFiles.getNode("range-score", 1);
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obj.RelBearing = obj.TgtsFiles.getNode("ddd-relative-bearing", 1);
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obj.Carrier = obj.TgtsFiles.getNode("carrier", 1);
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obj.EcmSignal = obj.TgtsFiles.getNode("ecm-signal", 1);
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obj.EcmSignalNorm = obj.TgtsFiles.getNode("ecm-signal-norm", 1);
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obj.EcmTypeNum = obj.TgtsFiles.getNode("ecm_type_num", 1);
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obj.Display = obj.TgtsFiles.getNode("display", 1);
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obj.Fading = obj.TgtsFiles.getNode("ddd-echo-fading", 1);
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obj.DddDrawRangeNm = obj.TgtsFiles.getNode("ddd-draw-range-nm", 1);
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obj.TidDrawRangeNm = obj.TgtsFiles.getNode("tid-draw-range-nm", 1);
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obj.RoundedAlt = obj.TgtsFiles.getNode("rounded-alt-ft", 1);
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obj.TimeLast = obj.TgtsFiles.getNode("closure-last-time", 1);
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obj.RangeLast = obj.TgtsFiles.getNode("closure-last-range-nm", 1);
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obj.ClosureRate = obj.TgtsFiles.getNode("closure-rate-kts", 1);
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obj.TimeLast.setValue(ElapsedSec.getValue());
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if ( obj.Range != nil) {
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obj.RangeLast.setValue(obj.Range.getValue());
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} else {
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obj.RangeLast.setValue(0);
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}
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obj.RadarStandby = c.getNode("sim/multiplay/generic/int[2]");
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obj.deviation = nil;
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return obj;
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},
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get_heading : func {
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var n = me.Heading.getValue();
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me.BHeading.setValue(n);
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return n;
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},
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get_bearing : func {
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var n = me.Bearing.getValue();
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me.BBearing.setValue(n);
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return n;
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},
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set_relative_bearing : func(n) {
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me.RelBearing.setValue(n);
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},
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get_reciprocal_bearing : func {
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return geo.normdeg(me.get_bearing() + 180);
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},
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get_deviation : func(true_heading_ref) {
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me.deviation = - deviation_normdeg(true_heading_ref, me.get_bearing());
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return me.deviation;
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},
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get_altitude : func {
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return me.Alt.getValue();
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},
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get_total_elevation : func(own_pitch) {
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me.deviation = - deviation_normdeg(own_pitch, me.Elevation.getValue());
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return me.deviation;
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},
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get_range : func {
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return me.Range.getValue();
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},
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get_horizon : func(own_alt) {
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var tgt_alt = me.get_altitude();
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if ( tgt_alt != nil ) {
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if ( own_alt < 0 ) { own_alt = 0.001 }
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if ( debug.isnan(tgt_alt)) {
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return(0);
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}
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if ( tgt_alt < 0 ) { tgt_alt = 0.001 }
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return radardist.radar_horizon( own_alt, tgt_alt );
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} else {
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return(0);
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}
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},
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check_carrier_type : func {
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var type = "none";
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var carrier = 0;
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if ( me.AcType != nil ) { type = me.AcType.getValue() }
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if ( type == "MP-Nimitz" or type == "MP-Eisenhower" or type == "MP-Vinson") { carrier = 1 }
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# This works only after the mp-carrier model has been loaded. Before that it is seen like a common aircraft.
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me.Carrier.setBoolValue(carrier);
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return carrier;
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},
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get_rdr_standby : func {
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var s = 0;
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if ( me.RadarStandby != nil ) {
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s = me.RadarStandby.getValue();
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if (s == nil) { s = 0 } elsif (s != 1) { s = 0 }
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}
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return s;
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},
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get_display : func() {
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return me.Display.getValue();
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},
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set_display : func(n) {
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me.Display.setBoolValue(n);
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},
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get_fading : func() {
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var fading = me.Fading.getValue();
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if ( fading == nil ) { fading = 0 }
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return fading;
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},
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set_fading : func(n) {
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me.Fading.setValue(n);
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},
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set_ddd_draw_range_nm : func(n) {
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me.DddDrawRangeNm.setValue(n);
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},
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set_hud_draw_horiz_dev : func(n) {
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me.HudDrawHorizDev.setValue(n);
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},
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set_tid_draw_range_nm : func(n) {
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me.TidDrawRangeNm.setValue(n);
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},
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set_rounded_alt : func(n) {
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me.RoundedAlt.setValue(n);
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},
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get_closure_rate : func() {
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var dt = ElapsedSec.getValue() - me.TimeLast.getValue();
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var rng = me.Range.getValue();
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var t_distance = me.RangeLast.getValue() - rng;
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var cr = t_distance/dt*3600;
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me.ClosureRate.setValue(cr);
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me.RangeLast.setValue(rng);
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return(cr);
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},
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list : [],
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};
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