Radar minimum relative radial velocity BUG (Doppler notch)

[GumidekCZ]

I would like to report Doppler gate BUG.

Doppler gate relative radial velocity value of radars are frequently ignored, which results in some case to double of the Gate speed (attached F-15C Tacview files), or on the other hand, Su-27 able to track and launch R-27ER even if you are in almost Perfect Notch. (In Tacview you can choose to view the closure speed between two selected objects - I have very good corelation between RWR indication position and Tacview closure speed).
(relative radial velocity = closure speed – ground speed of interceptor)

I also tried to notch in different co-altitude with interceptor, which resulted in even more weird results:

I was able to notch F-15C up to 25 kft (from Tacview calculated that notch made with double size of DopGate speed), At higher altitude of 30kft, the DP speed limit decreased from double to almost  “zero” => unable to notch even if relative radial velocity lower than 10 knots (roughly 5m/s).

When same test done with Su-27, even though the N-001 radar have 1/3 bigger doppler gate (less sensitive), the Su-27 was able to keep lock on me, when I was at almost perfect notch at 20 kft. I suspect, that DCS Su and MiG can use its OLS-27 and KOLS infrared sensor to keep lock on you and guide the SARH missiles = that would be big BUG, because cant be done in real this way. OLS-27 and KOLS can only help slew seekers of IR missiles on target and measure distance up to max 6,5 km by laser ranging.

I highly suspect that this bug is not limited only those two airplanes with its sensors, but most of the DCS sensors with defined relative radial velocity minimum limit.

F-15C
AN/APG-63 radar
                velocity_limits = {
                                radial_velocity_min = 27.777777777778,
                                relative_radial_velocity_min = 27.777777777778 – m/s converted to knots = 54 kts
Su-27
N-001 radar
                velocity_limits = {
                                radial_velocity_min = 58.333333333333,
                                relative_radial_velocity_min = 41.666666666667 – m/s converted to knots = 81 kts

Su-27_fire_R-27ER_when_tgt_in_notch_.trk F-15_30kft_unable_notch_AIM-7_fired_in Notch.acmi F-15_20kft_double_notch_Gate.acmi