Source «overscan – aerospacetech».

N011 This radar design was initiated in the early/mid 80s for the Su-27M program by Tamerlan Bekirbayev, drawing on experience gained with the original, unachievable Myech design and the experimental Soyuz program by NPO Istok. It was not without problems, and fell victim to a decision that all future radars should be phased-array, despite the greater cost. NIIP drew on technology from their cancelled N014 radar intended for the MFI to improve the N011 with a passive phased array antenna and better signal processing. N011 Mechanically scanned 960mm planar array antenna, ± 85° coverage. Said to be heavier than the N001. Uses a multimode wideband TWT transmitter with peak power output of 8 kW, and average of 2 kW. It features a low noise UHF input amplifier, and full digital signal processing using reprogrammable digital computers. Tough requirements, to track 20 targets and engage 8 simultaneously over a wide area, proved impossible to achieve with a mechanically scanned antenna. Initial versions proved able to track 13 aerial targets and engage four, which with further development could be extended to 15 and 6 respectively. It has five air-to-ground and four maritime modes. The maximum search range for large air targets such as airborne early warning and control aircraft is 400km, 140km against a head-on fighter-class target, 65km tail-on. In an air-to-ground mode, it can acquire surface targets at ranges of up to 200km, and undertake ground mapping, terrain- following and terrain-avoidance missions. Further development of the N011 is unlikely.

N011M Bars is an upgraded phased array antenna version of the N011. Under development since the early 1990s, two prototype N011M radars were produced, of which one was flight tested in Su-27M prototype “712”. It is now in production, and is currently fitted to the Su-30MKI. Antenna diameter is 1m, antenna gain 36dB, the main sidelobe level is -25dB, average sidelobe level is -48dB, beamwidth is 2.4° with 12 distinct beam shapes. The antenna weighs 110kg. It is both mechanically and electronically scanned to give increased field of view over a fixed phased array antenna and also to allow the radar to be tilted away when not in use, decreasing RCS. Two variants were initially proposed, the first was both electronically and mechanically scanned in azimuth (±30° mechanically plus ±60° electronically, for a total coverage of ±90°) and electronically scanned in elevation (±60°). The second was mechanically and electronically scanned in both azimuth and elevation (±90° in both axes). The N011M fitted to the Su-30MKI was the first type, but in testing the passive phased array proved unable to be electronically steered greater than 40° without unacceptable degredation of performance. Therefore scanning limits are reduced to ±70° (±30° mechanically, ±40° electronically) in azimuth and ±40° in elevation. Peak power output is 4-5kW, average power output is 1.2kW. Ts200 PSP (Programmable Signal Processor)
Data entry speed: 28 MHz
Peak performance on fourier transforms of “butterfly” type: 75 Million operations per second.
Radar control processor
Number of processors: 3
Processor RAM (or possibly Flash memory): 16 Mb
Processor ROM: 16 Mb
Weight of complete radar system is 650kg.
Initially India were supposed to construct both programmable signal processors (PSP) and data processors (RC) under project “Vetrivale” to replace the original Russian components. Unfortunately, LRDE expressed their inability to develop the system within the envisaged time frame, especially in view of the non-finalisation of the required technical specification by NIIP. The project therefore reverted to the Ts200 PSP originally designed for the Su-27M’s N011. The initial radar data processor delivered was also Russian. The contract for the N011M radar has three stages. The initial MK1 software was tested in 2002 and supplied with the first Su-30MKI deliveries. NIIP were finalising the 2nd stage (MK2), still using the Russian data processor, in October 2003, while testing on the final (MK3) revision had also begun. MK3 incorporates the Indian-designed Vetrivale RC (radar computer) based in the i960 architecture. Currently in 2004 MK3 is still in testing. While MK2 implements most of the modes above, full capability will only be met with the 3rd stage radar. The construction, the operating system and the applied ”Bars” radar control system software support fully are compatible with Western standards, which allows their upgrade without changing the logic of the radar control system’s operation. The computer technology is executed in Western military standard form factor (Compact PCI). A Bars’ test radar is said to have detected Su-27 fighters at a range of over 330 km, tracked several targets while volume scanning, and correctly identified aerial targets.

N012 OKB: NIIR Rassvet Tail radar used on Su-35/37 operating at decimetric wavelengths which is installed in the long tail boom between the tail pipes. This radar forms part of the aircraft’s defensive aids sub-systems suite (DASS) and warns the crew of approaching threats in the rear hemisphere as well as controlling active and passive jamming responses to such threats. Claimed to have a range of 50km for a 3 sq m RCS fighter, or 100km for a large aircraft. Scans 60° in azimuth and elevation.

N014 OKB: Tikhomirov NIIP Associated with the Mikoyan 1-42/1-44 project, the passive phased array N014 radar project from NIIP was abandoned. Supposed to track 40 targets. Range up to 420km. Used in conjunction with the N012 tail radar. The antenna was scanned electronically and mechanically to increase angular coverage. Some elements or techniques from it were applied to the N011M. NIIP have experimented with bistatic radar techniques, which were probably intended for N014.

In the beginning Tupolev suggested to build a bomber on the basis of Tu-144, but have chosen Myasishchev M-18,

In the beginning of a theme my figure PAK FA is placed, it is imagination, instead of a reality.