Three questions about radars

1. Can the F-22 detect that he has been detected, if the other aircraft hasn’t switched to TWS mode, or STT, or anything, just ordinary scan, without altering it’s trajectory, behaving same?

2. With the public released figure of 400km vs 3m2 RCS in frontal aspect for Tikhomirov N035E radar, what are the chances of other guy’s RWR detecting emissions at that high BVR distances? Even for a peak power output of 20kW, 400 km is a lot of distance for signal power falloff…

3. About MiG-21, some more “recent” batches could carry R-60 missiles. Does the FCS allow firing those missiles without previous radar lock? Eg. to slave the missile seeker to the HUD piper, much like in Su-25, it also uses Aphids for self-defense and has no radar or any kind of aerial sensor.

My guesses :

1. If the ALR-94 recognizes the emitting platform, let’s say that it’s been identified as N001M, it could compute the maximum detection range against it’s RCS, by using the data from the system database. Range of the emmiter would be aproximated by the signal level, taking into the account capabilities of the hostile radar which should be defined in the database. Further, the system would need to compute it’s own RCS by taking the viewpoint-to-the-radar angles into consideration, and grant out the approximate maximum detection range in the current scenario. ALR-94 is said to be a mighty and sophisticated piece of equipment, but this is a pure conjecture on my side, i don’t know if it could pull of something like this.

2. Really depends on the RWR of the targeted aircraft. Eg, depends on it’s processing power. What i would really like to know, what western devices could detect emissions at 300-350 km distance. Fighter carried devices, to be more precise.

3. Probably, it doesn’t look hard to implement HUD seeker slaving, most of radarless Soviet aircraft, and platforms without any kind of aerial sensors can use short-range IR homers for selfdefense. I’d just like this to be confirmed, looks to me like the RP-21 is just giving out your position in the air, since it’s detection ranges are well inside visual range in clear conditions. It would be better to use your own set of eyes and some info from the GCI to track the target down and home the R-60’s on it, then to scan the airspace with the RP-21. Of course, in clear-sky conditions.

This stuff crossed my mind lately, my assumptions seem logical to me, but i’d like second-opinion, too. Thank you for your time.