Highly-advanced digital CETC DWL002 Passive Detection System

DWL002

DLW002 CONOPS diagram

DWL002 Emitter Locating System (ELS) is a big evolutionary leap beyond the original Russian Tamara and improved Vera ELS systems.

The key feature is the addition of a second receiver. This provides the DWL002 ELS with two important advantages.

Firstly, a single DWL002 unit can use triangulation to pinpoint the exact location of an enemy aircraft. In contrast, a single Russian receiver can only identify the direction but not the precise location of an enemy aircraft.

Secondly, DWL002 has two receivers that permit interferometry. Though this does not increase the range, the resolution/sensitivity is equivalent to a receiver that is almost the length of the mast.

I have included two citations below to show that China has researched interferometry, including X-band radar.

If two Chinese DWL002 are linked via tight wireless transmission or fiber-optic cables to create a super-interferometer, the resolution would be incredible. If multiple DWL002 are interconnected and the data is processed by computers, the result is an interferometer of unimaginable sensitivity.

Main Functions:
    * Realtime & Accurate Location and Tracking
    * Signal Analysis and Identification
    * Long Range Detection and Early Warning

Main Features:
    * Passive
    * Real Time
    * Very Good Mobility

DWL002 Passive Detection System is a three station configuration (expandable to four station configuration). Each station. including antenna and power generator. is housed and carried by one vehicle. which ensures the good mobility of the system

    * Remote Control
    * Advanced techniques

Read more :

Assessment of Polarimetric and Interferometric Image Quality for Chinese Domestic X-Band Airborne SAR System

Applying SAR Interferometry for Ground Deformation Detection in China

CETC DWL002 Passive Detection System | Air Power Australia

CETC YLC-20 Emitter Locating System

YLC-20 or Kolchuga M with its S-300PMU/PMU1/PMU2 SAM batteries

YLC-20 is intended to detect, locate and identify:

aerial emitting targets using active radar, including fighters, AEW&C aircraft and UAVs.
surface targets including early warning radars, acquisition radars and fire control radars.
emitting communications equipment.

Stated band coverage is 380 MHz to 12 GHz. Deployment time is claimed to be 1 hr, with all system components on 8x8 or 6x6 trucks. At the time of writing no good quality imagery of production equipment was available through open sources. This limits current assessments of the system's capabilities. It is likely that DTOA techniques are used for target acquisition and coarse tracking, and DF techniques used for precision tracking, using DTOA derived coordinates to cue an interferometric DF antenna. Avaliable material does not state whether a heightfinding capability is provided, if so this would likely be performed using interferometric techniques with the DF subsystem. Once better quality imagery of the antenna arrangement becomes available, a more precise definition of capabilities and limitations will be possible.