GumidekCZ Posted October 4, 2021 Posted October 4, 2021 (edited) Just recently i searched some DCS scripts and found very strange things, which guide my thoughts to search for more RW evidence about missile final miss distance. I found this book: Basic Principles of Homing Guidance - Neil F. Palumbo, Ross A. Blauwkamp, and Justin M. Lloyd There is an chapter: Contributors to Final Miss Distance Page 33. Quote Some of the key contributors to final miss distance: Seeker receiver range-dependent angle noise Seeker range-independent angle noise - This noise is independent of target return power and is caused by a number of internal sources like signal processing and quantization effects, gimbal servo drive errors, and other electrical noise. Scintillation (and glint) noise Clutter and multipath noise Imperfect seeker stabilization caused by seeker gyro and gimbal scale factors, gyro drift, and missile body bending (flexing). Imperfect seeker stabilization can introduce parasitic feedback loops similar to that caused by radome/irdome distortion. The net effect can be viewed as inducing a bias or perturbation on the measured LOS rate. Exactly how these errors affect guidance performance will be a function of the way in which LOS reconstruction is mechanized. Initial heading errors at the start of homing Target acceleration (maneuver) perpendicular to the LOS. All points are described in more detail there. So my idea is that accuracy and Missile final miss distance in DCS should NOT be based on just wide spread general number across most/all missiles of its class (with some BUG like missiles SA-5, Stinger, Rapier, Patriot), but the predefined miss should be based on technological level of the producer at the time, the missile was designed or upgraded. Question can be laid, if the radius(diameter) should be placed withing Gauss curve or it should be linear. In addition, I added for each missile its Kill Distance radius (fuze radius for the warhead), so you can now make a picture which missile can go closer to you and which missile have bigger kill radius. Some of the numbers are very disturbing and I will report them as a BUG. SAM: S-75(SA-2) 2V755 missile test 1959: sigma = { 50, 50, 50 }, KillDistance = 20 S-200 VEGA (SA-5 GAMMON) 1967 sigma = { 10.81, 10.81, 10.81 }, - only 10.81m!!! - I will report as a DCS BUG. KillDistance = 45, SM-2: introduced in 1970, sigma = { 50, 50, 50 }, KillDistance = 15 HAWK MIM-23B Introduced in 1971: sigma = { 50, 50, 50 }, KillDistance = 12 S-300PS(SA-10) introduced in 1985, sigma = { 50, 50, 50 }, KillDistance = 20 PATRIOTs PAC-2 was first tested in 1987, sigma = { 50, 50, 50 }, KillDistance = 13 PATRIOT, S-300 systems were designed to also kill other missiles, but with sigma 50 its very unlikely, especialy for PATRIOT with just only 13m kill distance. Another example are IR guided A-A missiles - Almost ALL of them from the oldest (AIM-9B) to the newest (except the AIM-9X), all have the same sigma = { 3, 3, 3 }, I will add one more example of impact fuzed warhead SAM missile later toady. Need to go now Edited October 6, 2021 by GumidekCZ
GumidekCZ Posted October 6, 2021 Author Posted October 6, 2021 AIM_54 all versions: sigma = { 5, 5, 5 }, (all versions: KillDistance = 15,) R-33(AA-9 AMOS): sigma = { 10, 10, 10 }, (KillDistance = 12,) AIM-7E: aim_sigma = 8, (proximity_fuze radius = 12,) AIM-7F: aim_sigma = 5.5, (proximity_fuze radius = 12,) AIM-7M: aim_sigma = 5.5, (proximity_fuze radius = 12,) AIM-7MH, aim_sigma = 5.5, (proximity_fuze radius = 12,) SeaSparrow (RIM-7): aim_sigma = 5.5, (KillDistance = 12,) Super_530D, R-24R, R-27R, R-40R, R-77: sigma = { 5.6, 5, 5.6 }, (530D: KillDistance = 10, R-77: KillDistance = 15, R-27R/ER : KillDistance = 11, R-24R KillDistance = 6, R-40R KillDistance = 7,) R-3R: sigma = { 5, 5, 5 }, (KillDistance = 5,) AIM_120B: aim_sigma = 7, (proximity_fuze radius = 7,) AIM_120C-5: aim_sigma = 6, (proximity_fuze radius = 7,) SD-10: aim_sigma = 7, (proximity_fuze radius = 10,) Now you can see, that even very old A-A radar guided missiles (R-3R, R-24R, R-40R, early AIM-54, AIM-7F and M, have in DCS same Missile final miss distance value as the modern ones. Considering an article in book mentioned in previous post, there is certainly some wrong values.
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