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YLC-20 TWO-STATION PASSIVE DIRECTION-FINDING AND LOCATING RADAR

(Last updated 24 September 2006)

The YLC-20 is a passive surveillance radar system similar to the VERA-E system developed by ERA of the Czech Republic. Based on the “Time Difference of Arrival Principle”, the system locates the source of signal position in two or three dimensions by solving for the mathematical intersection of multiple hyperbolas based on the Time Difference Of Arrival (TDOA) between the signal reception at multiple sensors. Using two hyperbolas (three receivers) the system can obtain 2D target position, while using at minimum three hyperboloids (four receivers) the system can achieve full 3D target locating. Higher accuracy can be achieved by using more receivers.

The VERA-E system was originally developed as an electronic intelligence (ELINT) system for locating enemy electronic sensors. However, it was later noted that the system can be effectively used to detect stealth aircraft, which conventional radar systems are unable to detect. China ordered six VERA-E systems from the Czech Republic worth US$55 million in 2004 but the deal was reportedly cancelled due to the objection of the U.S. government.

During the 5th China International Electronic Exhibition (CIDEX) held in Beijing in April 2006, 14th Institute of China Electronic Technology Corporation (CETC) revealed its YLC-20 two-station passive surveillance radar system, which appears to be similar to the VERA-E. It is not known whether the YLC-20 has any connection to the VERA-E technology.