237 lines
8.3 KiB
Plaintext
237 lines
8.3 KiB
Plaintext
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# ****************************************************************************
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# CUI
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#
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# The Advanced Framework for Simulation, Integration, and Modeling (AFSIM)
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#
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# The use, dissemination or disclosure of data in this file is subject to
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# limitation or restriction. See accompanying README and LICENSE for details.
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# ****************************************************************************
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###############################################################################
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# ------ UNCLASSIFIED ------
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###############################################################################
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#
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# ***** WARNING ***** WARNING ***** WARNING ***** WARNING ***** WARNING *****
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#
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# This definition is intended to be EXPORTABLE. It is defined using publicly
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# available, attributable sources. DO NOT ADD ANYTHING BASED ON OTHER SOURCES!
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#
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# ***** WARNING ***** WARNING ***** WARNING ***** WARNING ***** WARNING *****
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#
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###############################################################################
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#
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# References: (PDF files contained in the subdirectory blue_sr_sam_ref)
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#
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# 1) Jane's JLAD Patriot PAC-3, 21-May-2009
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# Diameter: .255 m, Length 5.205
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# Mass: 315 kg for BLUE_SR_SAM, 312 kg for BLUE_SR_SAM MSE
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# Max Speed: 1700 m/s for BLUE_SR_SAM, >1700 m/s for BLUE_SR_SAM MSE
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# Max Range: 15 km for BLUE_SR_SAM, 22 km for BLUE_SR_SAM MSE
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#
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# 2) http://en.wikipedia.org/wiki/MIM-104_Patriot
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# 'The system's missiles are transported on and launched from the M901
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# Launching Station, which can carry up to four PAC-2 missiles or up to
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# sixteen PAC-3 missiles.'
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#
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###############################################################################
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#
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# NOTE: If you modify any parameter in this file, you must rerun 'weapon_tools'
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# with 'blue_sr_sam_lcg.txt' as input to regenerate the launch computer data.
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#
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###############################################################################
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# Signature data is unknown...
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infrared_signature BLUE_SR_SAM_INFRARED_SIGNATURE
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constant 1 watts/steradian
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end_infrared_signature
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optical_signature BLUE_SR_SAM_OPTICAL_SIGNATURE
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constant 1 m^2
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end_optical_signature
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radar_signature BLUE_SR_SAM_RADAR_SIGNATURE
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constant 1 m^2
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end_radar_signature
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# Nominal lethality data.
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weapon_effects BLUE_SR_SAM_EFFECT WSF_GRADUATED_LETHALITY
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radius_and_pk 100.0 m 0.9
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# This script will reduce the effectiveness if the impact geometry is not desirable.
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script void on_weapon_target_engagement(WsfPlatform aTarget)
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WsfPlatform weapon = WeaponPlatform();
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if (! (aTarget.IsValid() && weapon.IsValid())) return;
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// Compute the angle between the velocity vectors. A head-on hit would be 180 degrees.
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// (velocity vectors in opposite directions).
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Vec3 weaponVel = weapon.VelocityWCS();
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Vec3 targetVel = aTarget.VelocityWCS();
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double weaponVelMag = weaponVel.Magnitude();
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double targetVelMag = targetVel.Magnitude();
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if ((weaponVelMag > 1.0) && (targetVelMag > 1.0))
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{
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double cosAngle = Vec3.Dot(weaponVel, targetVel) / (weaponVelMag * targetVelMag);
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if (cosAngle < -1.0) cosAngle = -1.0;
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if (cosAngle > 1.0) cosAngle = 1.0;
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double angle = Math.ACos(cosAngle);
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writeln("Angle=", angle);
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//TODO if (angle < xxx) SetPkDegrade(0.6);
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}
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end_script
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end_weapon_effects
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###############################################################################
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aero BLUE_SR_SAM_AERO WSF_AERO
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reference_area 0.0510705 m2 # Ref 1, 0.255 m diameter
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aspect_ratio 2.0
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cl_max 4.5
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cl_max 20.0 # TODO-TEST
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# Values estimated from Hoerner's Drag book
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cd_zero_subsonic 0.10
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cd_zero_supersonic 0.35
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mach_begin_cd_rise 0.95
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mach_end_cd_rise 1.30
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mach_max_supersonic 6.00
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end_aero
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mover BLUE_SR_SAM_MOVER WSF_GUIDED_MOVER
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integration_timestep 0.001 secs
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update_interval 0.01 secs
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stage 1
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aero BLUE_SR_SAM_AERO
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total_mass 315 kg # Ref 1
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# Ref 2 defines the warhead to be 73 kg
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# Add another 20% of remaining mass for structure. (Space Shuttle SRB is
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# about 15% structure, but we're making it 20% to account for higher G's.
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#
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# 315 kg - 73 kg = 242 kg
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# 242 kg * 0.2 = 48.4 kg
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# So empty mass = 73 + 48 = 121.4 kg
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empty_mass 121.4 kg # See calculations above
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specific_impulse 250 sec # Nominal solid rocket
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burn_time 13 sec # Estimated to get speed ~= 1700 m/s
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end_stage
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end_mover
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###############################################################################
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processor BLUE_SR_SAM_GUIDANCE WSF_GUIDANCE_COMPUTER
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# No datalink or seeker is being used, so we must guide to the true target
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guide_to_truth true
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phase LAUNCH
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guidance_delay 100.0 sec
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next_phase PITCH_OVER when phase_time >= 0.1 sec
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end_phase
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phase PITCH_OVER
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commanded_flight_path_angle from_launch_computer
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proportional_navigation_gain 0.0 # Don't guide to target
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velocity_pursuit_gain 0.0 # Don't guide to target
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maximum_commanded_g 20.0 g
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next_phase MIDCOURSE when on_commanded_flight_path_angle
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end_phase
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phase MIDCOURSE
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# no guidance (just use gravity turn)
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guidance_delay 1000.0 sec
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next_phase TERMINAL when time_to_intercept < 12.0 sec
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end_phase
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phase TERMINAL
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proportional_navigation_gain 10.0
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proportional_navigation_method augmented
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# Disable velocity pursuit. The angle which controls the switch between
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# velocity pursuit and pronav are too sensitive at short ranges.
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velocity_pursuit_gain 0.0
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# Disable g-bias. The target is also falling, so we don't want to fight
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# against it! (this is assuming terminal intercept, not boost)
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g_bias 0.0
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end_phase
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end_processor
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###############################################################################
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platform_type BLUE_SR_SAM_BASE WSF_PLATFORM
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icon SA-10_Missile
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infrared_signature BLUE_SR_SAM_INFRARED_SIGNATURE
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optical_signature BLUE_SR_SAM_OPTICAL_SIGNATURE
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radar_signature BLUE_SR_SAM_RADAR_SIGNATURE
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weapon_effects BLUE_SR_SAM_EFFECT
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mover BLUE_SR_SAM_MOVER
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#show_status
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#time_history_path .
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end_mover
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processor guidance BLUE_SR_SAM_GUIDANCE
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#show_status
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#show_graphics
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end_processor
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processor fuse WSF_AIR_TARGET_FUSE
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detonate_below_mach 1.0
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# The following are used to limit the run time during launch computer
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# generation. They can be removed for real simulation use if one really
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# wants to see the missile do something after a big miss.
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detonate_above_height_msl 35 km
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max_time_of_flight_to_detonate 80 sec
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end_processor
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end_platform_type
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###############################################################################
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launch_computer BLUE_SR_SAM_LAUNCH_COMPUTER WSF_BALLISTIC_MISSILE_LAUNCH_COMPUTER
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surface_to_air_table weapons/sam/blue_sr_sam_launch_data.txt
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integration_time_step 0.05 sec
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# Disallow intercepts at unreasonable angles
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maximum_intercept_angle 60 deg
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end_launch_computer
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###############################################################################
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weapon BLUE_SR_SAM WSF_EXPLICIT_WEAPON
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# The location offset puts the weapon center at half the length - 1 m.
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# This assumes the scenario creator puts the launching platform at 1 m agl.
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location 0.0 0.0 -1.6025 m # Ref 1, length = 5.205 m
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launched_platform_type BLUE_SR_SAM
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launch_computer BLUE_SR_SAM_LAUNCH_COMPUTER
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end_launch_computer
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tilt 35 deg
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# This causes a call to the launch computer to compute the predicted intercept.
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# The launcher will then be cued to the proper angles (Subject to the slewing
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# limits defined below). This is a bit of a hack until the guidance computer
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# is changed...
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cue_to_predicted_intercept true
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slew_mode azimuth
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azimuth_slew_limits -180 deg 180 deg
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quantity 16 # Ref 2
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# Abort the launch if the launch computer didn't provide the required data
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require_loft_angle
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end_weapon
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