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Zhuk-MS is an Su-27 sized version of Zhuk-M. Peak power is increased to 6 kW and average power to 1.5 kW. The antenna diameter is enlarged to 960 mm with 37dB gain.

Scanning zone is ±20, ±30, or ±60° in azimuth and 2 or 4 bars in elevation. Scanning limits are ±90° , +60/-40° in elevation.

of detection/track angle in azimuth and two or four bars in elevation (+60/-40° maximum).

The maximum range was quoted as 140 km headon, and 50 km in tailchase. In flight testing in 2004 a range of 200km (80km in tailchase) was demonstrated against an 'armed Su-27' type target (15 sq m RCS), which implies actual figures for a standard 5 sq m RCS target would be 150km headon, 60km in tailchase.

The radar can track 10 targets simultaneously and can engage 4 to 6 targets at once with R-77 missiles. It introduced synthetic-aperture-radar (SAR) modes (3 m resolution) and terrain-following modes in the air-to-ground role.

Zhuk-MS is currently tested on the Su-27KUB

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.

Air to air modes

Velocity Search
Range While Search
Detection range in headon engagements: 120-140km
Detection range in tailchase engagements: 60km
Track While Scan of 15 targets
Precision Tracking up to 4 targets for engaging targets while continuing volume search.
Scanning zone while tracking is given as 5,500 square degrees in one document, while another says targets can be tracked anywhere in the 80° tracking zone of the radar while continuing to scan. A ±40° azimuth by ±40° elevation scan area like this suggests would be 6,400 square degrees.
Target Illumination; generation of radio update commands for BVR AAMs.
Track ECM source
Raid Assessment while scan
Target Identification while scan
On switching on of this mode, the “Bars” radar control system determines the type of aerial target detected through the parameters of the signal reflected from the target. Identified generic target types include “large target,” “medium target,” “small target,” “group target,” transport airplane, helicopter, and jet airplane. Upon introduction into the database of the appropriate spectral characteristics, this mode can identify exact aircraft types. The technique is thought to be based on on identifying engine type from the signal modulation induced by rotating engine compressors. 5 targets can be identified in 1 second, while the radar continues to volume scan and track other targets.
Several close combat modes for search, lock-on and tracking of a single aerial target in close-in maneuvering combat.
Limits:
Azimuth: ±3° or ±10°
Elevation: -15/+40° or ±7.5°
Air-to-ground modes

Real beam mapping
DBS mapping
SAR mapping
Moving ground target selection
Measuring of ground target coordinates and tracking up to 2 ground targets
Range, a railroad bridge: 80-120km
Range, group of tanks: 40-50km
Best resolution in SAR mode: 10m
Anti shipping modes

Long range detection of huge sea targets
Sea surface scan and detection of sea targets
Range against a destroyer sized target: 120-150km
Moving sea target selection
Measuring of coordinates, tracking up to 2 sea targets, moving or stationary
Naval target ID
Mixed modes

Search air-to-air targets while tracking ground or sea targets
Track one ground target while simultaneously firing at an aerial target in long-range combat