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# ****************************************************************************
# 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