1997-05-29 00:09:51 +00:00
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/***************************************************************************
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TITLE: ls_constants.h
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----------------------------------------------------------------------------
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FUNCTION: LaRCSim constants definition header file
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----------------------------------------------------------------------------
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MODULE STATUS: developmental
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----------------------------------------------------------------------------
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GENEALOGY: Created 15 DEC 1993 by Bruce Jackson; was part of
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old ls_eom.h header file
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----------------------------------------------------------------------------
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DESIGNED BY: B. Jackson
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CODED BY: B. Jackson
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MAINTAINED BY: guess who
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----------------------------------------------------------------------------
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MODIFICATION HISTORY:
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DATE PURPOSE BY
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----------------------------------------------------------------------------
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REFERENCES:
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[ 1] McFarland, Richard E.: "A Standard Kinematic Model
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for Flight Simulation at NASA-Ames", NASA CR-2497,
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January 1975
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[ 2] ANSI/AIAA R-004-1992 "Recommended Practice: Atmos-
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pheric and Space Flight Vehicle Coordinate Systems",
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February 1992
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[ 3] Beyer, William H., editor: "CRC Standard Mathematical
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Tables, 28th edition", CRC Press, Boca Raton, FL, 1987,
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ISBN 0-8493-0628-0
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[ 4] Dowdy, M. C.; Jackson, E. B.; and Nichols, J. H.:
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"Controls Analysis and Simulation Test Loop Environ-
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ment (CASTLE) Programmer's Guide, Version 1.3",
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NATC TM 89-11, 30 March 1989.
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[ 5] Halliday, David; and Resnick, Robert: "Fundamentals
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of Physics, Revised Printing", Wiley and Sons, 1974.
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ISBN 0-471-34431-1
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[ 6] Anon: "U. S. Standard Atmosphere, 1962"
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[ 7] Anon: "Aeronautical Vest Pocket Handbook, 17th edition",
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Pratt & Whitney Aircraft Group, Dec. 1977
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[ 8] Stevens, Brian L.; and Lewis, Frank L.: "Aircraft
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Control and Simulation", Wiley and Sons, 1992.
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ISBN 0-471-61397-5
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--------------------------------------------------------------------------*/
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#ifndef CONSTANTS
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#define CONSTANTS -1
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/* Define application-wide macros */
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#define PATHNAME "LARCSIMPATH"
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#ifndef NIL_POINTER
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#define NIL_POINTER 0L
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#endif
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/* Define constants (note: many factors will need to change for other
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systems of measure) */
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/* Value of Pi from ref [3] */
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1997-07-19 22:35:06 +00:00
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#ifdef PI
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# undef PI /* avoid a harmless compiler warning */
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#endif
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1997-05-29 00:09:51 +00:00
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#define PI 3.14159265358979323846264338327950288419716939967511
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/* Value of earth radius from [8], ft */
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#define EQUATORIAL_RADIUS 20925650.
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#define RESQ 437882827922500.
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/* Value of earth flattening parameter from ref [8]
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Note: FP = f
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E = 1-f
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EPS = sqrt(1-(1-f)^2) */
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#define FP .003352813178
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#define E .996647186
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#define EPS .081819221
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#define INVG .031080997
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/* linear velocity of earth at equator from w*R; w=2pi/24 hrs, in ft/sec */
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#define OMEGA_EARTH .00007272205217
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/* miscellaneous units conversions (ref [7]) */
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#define V_TO_KNOTS 0.5921
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#define DEG_TO_RAD 0.017453292
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#define RAD_TO_DEG 57.29577951
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#define FT_TO_METERS 0.3048
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#define METERS_TO_FT 3.2808
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#define K_TO_R 1.8
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#define R_TO_K 0.55555556
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#define NSM_TO_PSF 0.02088547
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#define PSF_TO_NSM 47.8801826
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#define KCM_TO_SCF 0.00194106
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#define SCF_TO_KCM 515.183616
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/* ENGLISH Atmospheric reference properties [6] */
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#define SEA_LEVEL_DENSITY 0.002376888
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#endif
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/*------------------------- end of ls_constants.h -------------------------*/
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