OVERVIEW: The KRTP-91 Tamara-M (NATO: TRASH CAN) ELS is a is a truck mobile, ESM system for passive direction finding and locating airborne emitters operating in the C-J (NATO) or UHF-KU (IEEE) bands. 

DETAILS: The KRTP-91/Tamara-M uses Differential Time of Arrival (DTOA) capabilities to locate both airborne and surface emitters.

The deployed system typically comprises a central site containing the signal processing equipment and an ESM receiver and two or three side sites containing only an ESM receiver. The receivers typically are targeted against emitters such as secondary surveillance radar (SSR) transponders, identify friend or foe (IFF) transponders, airborne radars, weather radars, tactical air navigation (TACAN) transponders, distance measurement equipment (DME) beacons, digital communications signals, and pulsed jamming signals.  The received signals are transmitted to the central site over a microwave link. The central site uses the known propagation delay from the side sites to estimate the TDOA of the pulses at each site.  The side sites are usually deployed 15-40 km from the central site, providing a compromise of coverage and accuracy.  The system can provide a 2D location with reception from two receivers, and a 3D location with reception from 3 or more receivers. Up to 23  targets can be automatically tracked simultaneously by radar emmissions, while 48 can be tracked by IFF emissions.


Specifications:

Frequency: 		 820 MHz-18 GHz (B-J Bands (NATO); UHF, L, S, C, X, KU Bands (IEEE)))  
	
Range Resolution:	 unknown m (range), unknown degrees azimuth 					
On/Off time:		 unknown
Deploy/Stow Time	 ?? min / ?? min
Max Range:		 240 nm (radar horizon)

NOTES:  IOC 1991.  

SOURCES:"Czech Army to Purchase Vera-NG Passive Radars." Czech Defence Journal. Accessed August 9, 2021. https://www.czdjournal.com/defence/czech-army-to-purchase-verang-passive-radars-72.html ; kopp, Dr C. "Warsaw Pact / Russian Emitter Locating Systems / ELINT Systems." Air Power Australia. Accessed August 9, 2021. https://www.ausairpower.net/APA-Warpac-Rus-PLA-ESM.html#mozTocId797754.