Well- the Russians have a particular difficulty in that their legacy systems were all programmed using machine code and had a very customised instruction set, which makes porting the code rather difficult. Either you have to develop an complete emulation for the original code, or you have to start almost from scratch.

The US uses a high level language (Ada) which makes porting from one processor to another easier.

Vympel’s pic is an illustration of an “advanced fighter” by the Russian “Stealth” Institute. They did work with Sukhoi on the T-60S and S-37 in reducing RCS, so there is a connection there, but I doubt Sukhoi would be very impressed if they gave away the PAK-FA configuration so it is likely that any resemblance is at the most basic level.

8g…will be a competition to get a fighter plane…

Yeah, because fighter planes spend their whole mission doing 9g turns….

Well the picture above shows you GDL. The two waveforms are out of phase. The peaks don’t quite match up.

The actual direction of travel of the radar beam is 90 degrees to the dotted line.

Well you must get a range boost over RWS or why would you sacrifice range information by using VS mode?

Judging by other radars it should be 25%-35% greater range.

Velocity Search mode doesn’t give you a range, just a direction and a closure rate, so how can it have a range display?

No it isn’t based on APG-65. When choosing the radar for the EFA, there were two options- the ECR-90 based on the Blue Vixen (Ferranti), and another radar based on the APG-65 (Marconi). The ECR-90 was chosen.

Radars: The passive-phase array antenna is a really good achievement however it is teamed with poor cpus and signal processors, denying the phase array antenna to show it’s true glory. I may be wrong, but I read some where that Indians are planning to replace the cpu/processor of Bars radar.

This is a misunderstanding.

The Bars radar stage 1 uses the processors developed for the N011 radar back in 1989.

The reason for this is that the radar source code was all written for this specific instruction set. It isn’t a simple task to port this to a new processor. So, to get the radar into service in a reasonable time, it is using older Russian cpus.

To put this in context, plenty of Western hardware is flying around with similarly out of date computer technology. Just ask Eurofighter about the 68020 processors 😉

Russia and India are jointly working on transitioning the Bars software to more modern processors. Stages II and III will add greater capabilities, but this was all part of the agreed plan, not some “hotfix” for a problem. Better to have a working radar now, and work towards full capability.