OLS-27 / Izdeliye 36Sh
NPO Geofizika
OLS-27
A combined IRST/LR device for the Su-27, similar to the MiG-29's KOLS but more sophisticated, using a cooled, broader waveband, sensor. Tracking rate is over 25deg/sec. 50km range in pursuit engagement, 15km head-on. The laser rangefinder operates between 300-3000m for air targets, 300-5000m for ground targets.
Search limits are ±60deg azimuth, +60/-15° in elevation. Three different FOVs are used, 60° by 10°, 20° by 5°, and 3° by 3°. Detection range is up to 50km, whilst the laser ranger is effective from 300-3000m. Azimuth tracking is accurate to 5 secs, whilst range data is accurate to 3-10m. Targets are displayed on the same CRT display as the radar. Weighs 174kg.
OLS-27K for Su-33 featured new algorithms and better processor. It allegedly tracked targets in pursuit mode by their IR signature at 90 km during tests.
KOLS / Izdeliye 13Sh / OEPS-29
OKB: NPO Geophyizika
OEPS-29 from the MiG-29
Fitted to the MiG-29A, KOLS is a combined IRST/LR device. All aspect device. Acquires targets independently, or with data input from the radar. Can detect a non-afterburning fighter head-on at a range of 12-18km. The collimated laser can provide ranging data from 200-6500m accurate to 3m. Scanning limits are ±30° azimuth, -15°/+30° elevation.
Chart showing KOLS operational modes from MiG-29 combat employment manual
Operates in several scanning modes. In large FOV mode scanning is ±30° azimuth, +30°/15° elevation. In small FOV mode scanning limits are ±30° azimuth and ±15° elevation. Close combat mode scans +16° to -14° by 4°. Lock-on mode scans 6° x 4°. Target tracking rate is up to 30°/sec.
KOLS is able to reject flares only if the combined signature of the flares is less than the target.
Targets are displayed on the same display as the radar.
This was posted earlier in one of the forum posts.