N011M
The second member of Bars radar family is N011M, a radar used an electronically scanned slotted planar antenna but with the experience gained from the development of the N007 Zaslon. In an effort to improve performance the antenna design was changed to a multi-channel Passive electronically scanned array (PESA). The design of the N011M bars antenna like the earlier N007 antenna consists of two separate electronically controlled arrays, an X-band radar and a L-band IFF transponder with a total weight of 100 kg and a diameter of 960 mm. The radar has a peak power output of 4-5 kW and is capable of positioning beams in 400 microseconds, a huge advantage over mechanically scanned radar. The Bars radar can be fixed in position to give a scanning sector of ±70 degrees in azimuth and ±45 degrees in elevation. To improve scan coverage, the radar can also be mounted on electromechanical drives, and in this case, the scanning sector is expanded to ±90 degrees.
The 28 MHz Ts200 programmable signal processor used in N011M incorporates Fourier transforms of "butterfly" type capable of 75 Million operations per second. The N011M supports digital signal processing using 3 processors with 16 MB of both static and flash memory. The peak output is 4 to 5 kW with an average output of 1.2 kW, and the total radar system weighs around 650 kg. N011M is used on Su-30MKI, and 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. India was supposed to build both programmable signal processors and data processors under project "Vetrivale" to replace the original Russian components, but failed to do so within the required time frame, so MK2 still used the Russia. In 2004, India delivered Vetrivale radar computer based in the i960 architecture. It's worth noting that N011M is not simply a PESA, but instead, it's a transition between PESA and AESA in that it adopts technologies from both: each transceiver on the antenna array of N011M has its own receiver amplifier, which is the same as AESA, and with noise level of 3dB, which is also in the same class of AESA arrays. However, for transmitting, N011M uses PSEA technology in that a single Chelnok traveling wave tube is used for EGSP-6A transmitter. There are three receiving channels for N011M.
N011M has a search range of 400 km and a tracking range of 200 km, with 60 km in the rear in the air to air mode. Detection range fighter type MIG-29 in area of review of over 300 sq. deg: - on towards course - up to 140 km; - in pursuit of - up to 60 km. Up to 15 air targets can be tracked at once in track-while-scan mode with 4 of these engaged at once. The N011M can use a number of short range and speed search modes and is capable of identifying the type and number of multiple targets. The Bars radar is compatible with R-77 and R-27 radar guided missiles providing both illumination and data-link guidance as well as the R-73 IR guided missile.
In the air to surface mode the radar is capable of detecting ground and naval based moving targets, determining their location and maintaining a track on two surface targets at once. The N011 is capable of detecting the group of tanks target to a maximum range of 40–50 km and a destroyer sized target to a range of 80–120 km. Bars also features a mapping mode using either real beam, doppler beam sharpening or Synthetic aperture radar with a maximum resolution of 10 meters. The Kh-31 anti-radiation missile is also compatible with the radar.
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