Prasad wrote:The Japanese XF9-1 is supposed to generate 180kw per engine. And next gen engines all are being designed to generate more electric power due to increase in need for radar and ew systems.
Even the Russian Ibris radar, which is a monster, pumps out only 5-6KW! 20KW is a waste of power. There is no pointing designing radar with ranges like 600KM or 1000KM. You don't want your adversary's RWR finding out about you from 1000KM! Nor are you going to fire a BVR at those distances!
Higher power requirements on fighters are to satisfy gizmos like IRST, ECM & laser weapons.
Advanced LPI radars does precisely that , they are hard to detect even at those ranges.I dont know how much of LPI tech goes into Russian radars but the F22 AESA ( APG 77 ) is 22 KW LPI radar and ranges out to more than 400 km with the new GaN modules, the APG 81 is a further development.
The more power you have , the more sensor capabilities you get and more power for ECMs operating in a wide band .. more is good and that is what you want
" Agile radars like AESA (or PESA) can change its frequency with every pulse (except when using doppler filtering), and generally does so using a random sequence, integrating over time does not help pull the signal out of the background noise. Moreover, a radar may be designed to extend the duration of the pulse and lower its peak power. An AESA or modern PESA will often have the capability to alter these parameters during operation. This makes no difference to the total energy reflected by the target but makes the detection of the pulse by an RWR system less likely.Nor does the AESA have any sort of fixed pulse repetition frequency, which can also be varied and thus hide any periodic brightening across the entire spectrum. Older generation RWRs are essentially useless against AESA radars, which is why AESA's are also known as 'low probability of intercept radars. Modern RWRs must be made highly sensitive (small angles and bandwidths for individual antennas, low transmission loss and noise) and add successive pulses through time-frequency processing to achieve useful detection rates " Source : Wiki
Having said that LPI means precisely that , its not NPI !!