Greetings Everyone!
This page share my long interests in aviation and especially avionics.
It is source of valuable information for me for years.
From this point - I want to thank for that. Especially thanks for Overscann - (starting from his original page for Russian avionics).
But it is first time I post here. I logged here especially to share some file I found some time ago. This is some lectures related to Russian avionics system.
One of them is related to Mig-29 radar (there are also some words related to N-001, but as we all know - there share many components in in many respects are identical).
Lectures are in Ukrainian language. It is similar to Russian, but differs in many respects.
Ok, here is link to ppt for RLPK-29 (radar of Mig)
https://studfiles.net/preview/5383872/ For whole lectures see
https://studfiles.net/nau/145/folder:11012/#5383849Find module: военка
and there modules :модуль 1, 2, 3
Lot of interesting stuff there like radio, radio links, radio - directional finers (it means ARK-19,22 etc) and similar stuff.
This is of course lectures, but many details avaiable.
Some facts from lectures (that I understood), about radar of Mig-29:
1) It can not be said that this is purely analog design. It is controlled by computer, but also it signal processing include digital processing.
Comment: Is seems natural, as processing of signal with intermediate repetition frequency is very difficult , if even possible in analog manner.
That is why the reason why Hugues win over Westinghouse for radar for F-15 (more sophisticated processing). And also why APG-9, pure analog design can work only in high repetition frequency mode
that has limited applicability over land in rear hemisphere
2) For tracking (SST mode)- there are completely different circuits, but finally tracking could be done with great precision (probably) even in high repetition frequency mode
3) Guard channel (called here - compensation channel) - seems to be triggered manually. It was somehow unexpected to me. It uses some resources of radar (digital filters) - so probably it results in slighty degradation of performance.
4) TWS mode - it seems to not use mono-pulse method for measuring angles of target.
Comment: According to I read (it might be not correct)- TWS in western radars is called as plot tracking with using mono-pulse angle measuring. But I do not find any description of western radar to compare.
It seems that there is no time to make additional two scans (vertical , horizontal) - as object within beam (beam 3.5 degree, scanning rate about 57 degrees / s or about 70 - so only 60ms over target, with radar cycle 10ms. And all processing have to be done in that time (It means 3 scanning for High PRF, and several scanning with different PRF for Med PRF, simple no time for monopulse filtering)
In RLPK TWS in this radar is based on plots, refresh rate is about 3.6 sec (depending on scanning mode) - so generally is not very.
Anyway - as we know in Mig-29 all that information is not exploited very clever - maybe only to find the top priority target and switch automatically to SST
(in Su-27 it is better exploited, at least positions, headings and altitude is encoded in target symbol)
5) command for R-27 are passed in 3 state code (like binary, but with 3 not 2 state)
And many others...