OVERVIEW:  The 3Ts-25E “Garpun-B” PLANK SHAVE B is a surface search and target acquisition radar  operating in the I-band (IEEE: X-band). 

DETAILS: The PLANK SHAVE B is a  surface-ship radar designed to provide surveillance surface and ASCM missile targeting using active and passive channels. The active channel uses a multiprocessor system to generate probing signals and radar data. It is integrated with a multi-computer secondary data processing and network.  In active mode it can track up to 150 targets. The radar is designed to exploit ducting conditions.  When used in fire control mode, it can control six SS-N-25/Kh35 missiles 

The passive channel can detect emitters operating at 0.8-12 GHz. In passive mode, it can analyze and classify radar signals by comparing their parameters with those available in the database with a range accuracy of 5-10% and a bearing accuracy of 0.5-1.5 minutes of arc. 


Specifications:

	Frequency:	8-10 GHz (I-band (NATO)
	PRF:		800 Hz
	Pulse width:	3 µ sec 
	Power: 		200 kW (peak)
	Accuracy:		40 m (range) 1.5 degrees (azimuth)
	Range, (1000m2 RCS tgt):	19-25nm (normal)
				49 nm (max, with ducting)
				76 nm (instrumented)
				135nm (super refraction)
	Range, passive	65-76nm (depending on frequency)
						

NOTES:  IOC: 1979. Modified to take advantage of ducting and consequentially classified as OTH radar. 

SOURCES: "3Ts-25E - Radartutorial." Grundlagen Der Radartechnik. Accessed March 7, 2024. https://www.radartutorial.eu/19.kartei/07.naval2/karte006.en.html. ; Corvette. "Kora (Type 25A) Class - Bharat Rakshak :: Indian Navy." : Bharat-Rakshak.com - The Consortium of Indian Military and Defence Websites :. Accessed March 7, 2024. https://www.bharat-rakshak.com/NAVY/Ships/Active/176-Kora-Class.html. ; Friedman, Norman. "World Naval Developments: Foreign Navies Exploit Advances in Over-the-Horizon Radar." USNI Proceedings. Last modified December 2003. https://www.usni.org/magazines/proceedings/2003/december/world-naval-developments-foreign-navies-exploit-advances-over. ;"Overview." Home — Military Periscope. Accessed March 7, 2024. https://www.militaryperiscope.com/weapons/sensorselectronics/naval-radars/plank-shave/overview/. ;"Shipborne Target Designation Radar 3TS-25E | Catalog Rosoboronexport." Рособоронэкспорт | Официальный сайт. Accessed March 7, 2024. https://roe.ru/eng/catalog/naval-systems/shipborne-electronic-systems/3ts-25e/. ;  Friedman, The Naval Institute Guide to World Naval Weapons Systems (5th ed) 2005-06, pg. 276