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