Re: R-27 AAM
You mean like R-27P passive variant?
It's a good question. I'm not really sure, but I would guess that the seeker has a wider bandwidth, so that it can lock onto signals from APG-63 and other Western radars. Normal R-27R is "tuned" to a specific illuminating frequency - it can home either on the target illumination by the own friendly radar, or on the target ECM, that is jamming the same frequency.
We know from passive heat-seeking missiles that range information is not necessary for proportional navigation homing, but angle information is necessary.
From:
[URL unfurl="true"]http://www.fas.org/man/dod-101/navy/docs/fun/part05.htm[/URL]
"It is very difficult to deceive a monopulse radar in angle..."
Yes, it follows the jamming signal, that is normally on the same frequency as the illumination, but stronger. Most jamming signals can only deny range or Doppler information to the seeker.
РНП и ДНП are illuminating at the same diapason but with the different frequency. РНП is only for target tracking (angular position, range and closing speed) and ДНП is only to illuminate for the missile. As I mentioned above they work by turn.
Why does the MiG-29 manual then say that "if track is lost while the missile is in flight, immediately illuminate the target in Scan mode"?
It sounds like the scan illumination must use the same frequency as missile illumination.
