220 lines
7.4 KiB
Text
220 lines
7.4 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] Scans /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 signal values
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# are writen under /instrumentation/radar2/targets for interoperabilty purposes.
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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 for the nearest target.
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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 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 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 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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radardist.init();
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settimer(rwr_loop, 0.5);
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}
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# Main loop ###############
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var rwr_loop = func() {
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ecm_on = EcmOn.getBoolValue();
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if ( ecm_on) {
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our_alt = OurAlt.getValue();
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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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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 = Threat.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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# 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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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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}
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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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} elsif ( size(tgts_list) > 0 ) {
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foreach( u; tgts_list ) {
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u.EcmSignal.setValue(0);
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u.EcmSignalNorm.setIntValue(0);
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u.EcmTypeNum.setIntValue(0);
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}
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}
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settimer(rwr_loop, 0.05);
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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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setlistener("sim/signals/fdm-initialized", init);
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# Target class
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var Threat = {
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new : func (c) {
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var obj = { parents : [Threat]};
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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.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_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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list : [],
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};
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