| Citation: | MIAO D，YANG D K，XU Z C，et al. Low-altitude, slow speed and small target detection probability of passive radar based on GNSS signals[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（3）：657-664 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0271
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Although passive radar based on global navigation satellite system (GNSS) signals has received domestic and international attention owing to its advantages such as the availability of multiple satellites, global coverage, and convenience of time synchronization, it is difficult to meet the actual detection requirements due to the movement of satellites and the limited target detection performance of a single satellite. The bistatic angle calculation procedure is described in accordance with the geometric configuration, and the theoretical expression of target detection probability is derived after analyzing the relationship between target radar cross section (RCS) and bistatic angle, and the connection between detection time and target maximum detection range. On these grounds, the target detection probability of passive radar based on GPS L5 signal under the detection pattern of single-satellite, multi-satellites fusion and forward-backward cooperation is evaluated. The simulation results show that the effective probability of detection under single-satellite forward or backward mode is less than 1%, which has an effective promotion to 25% under the detection pattern of multi-satellites fusion with forward-backward cooperation. Furthermore, the continuous detection method is adopted to change the irradiation direction of the receiving antenna to detect the target. In the forward and backward cooperative multi-source fusion detection mode, the effective detection time coverage is up to 98.96%, and the all-time effective detection is basically realized.
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