N011
The first member of Bars series radar was N011, which was originally an X-band Pulse-Doppler radar developed for the Su-27. In this original N011 form, it deploys an mechanically scanned planar array with 960 mm diameter, ±85 degrees scan sector. The peak output power is 8 kW with an average of 2 kW. N011 features a low noise UHF input amplifier, and fully digitized signal processing unit using reprogrammable digital computers.
The original requirement of simultaneously tracking 20 targets and engaging 8 of the 20 tracked proved impossible to achieve at the time due to Soviet technological bottleneck, but N011 is able to simultaneously track 13 target and engaging 4 of 13. This is subsequently upgraded to tracking 15 targets and engaging 6 of 15 tracked simultaneously. The maximum air-to-air detection range is over 400 km when used as an airborne early warning role, and when used for intercepting role, the range against a typical fighter sized target is 140 km against a head-on, and 65 km tail-on.
For air-to-surface mode, N011 has five air-to-ground modes and four maritime modes, including ground mapping, terrain-following and terrain-avoidance modes. The maximum air-to-surface mode is over 200 km against aircraft carrier type of target.
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