A NOVEL AMBIGUITY RESOLUTION ALGORITHM FOR TIME-DIVISION MULTI-PRF PASSIVE BISTATIC RADAR SYSTEMS

Passive bistatic radar, with its unique bistatic configuration, is widely used for target detection and tracking. However, challenges such as range ambiguity and Doppler ambiguity are inevitable in long-range and high-speed target detection. To address these challenges, time-division multiple pulse repetition frequency (TD-multi-PRF) transmissions can be utilized to enhance detection efficiency. For the range and Doppler ambiguity issues in constant velocity (CV) moving targets under TD-multi-PRF passive bistatic radar, a novel algorithm is proposed to simultaneously resolve range ambiguity and Doppler ambiguity. The algorithm performs Doppler expansion of the coherent integration within a sub-block and then performs parameter search for inter-sub-block coherent integration to get the target true Doppler. The target true range is obtained by an improved one-dimensional clustering (1DC) algorithm and using the minimum gradient search method to quickly resolve the distance ambiguity. The proposed algorithm is validated through target detection experiment.