Dealing with Doppler Migration for Passive Radar Based on Airborne High Speed Platform

The passive radar usually receives very weak target scattered waves, and long-term coherent accumulation is required to increase the receiving gain. However, for high-speed moving platforms, long-term accumulation will cause serious Doppler migration, which affects the energy concentration of the signal and further affects the target detection performance. This paper analyzes the reasons for the broadening and refers to ISAR imaging technology, and proposes a solution algorithm based on LVD transformation. This method transforms the broadened Doppler frequency into a two-dimensional frequency domain to form a peak with a high concentration of capabilities. The Doppler migration parameter completes the compensation for the Doppler expansion The method mainly uses FFT, complex multiplication and other operations in the realization process. and the realization process is simple and the calculation is less. The simulation results show that the proposed algorithm can effectively solve the Doppler migration problem, improve the target signal-to-noise ratio, and the computational complexity is lower than other algorithms.