Multi-Frame Integration Method via Short-Time Radon Lv’s Distribution for Passive Bistatic Radar

To address the multi-frame coherent integration problem of weak target, including range migration (RM) and Doppler frequency migration (DFM) within the integration, a multi-frame integration method based on the short-time Radon Lv's Distribution (STRLVD) is proposed in this paper. The proposed STRLVD algorithm can be classified into the following three primary steps. Initially, the Generalized Keystone (GKT) technique is employed to eliminate the coupling effect of acceleration and slow-time in each frame. Subsequently, the STRLVD method is performed to eliminate RM and DFM occurred within frame, which accomplishes energy integration and target peaks transfer in the centroid frequency-chirp rate (CFCR) domain. Finally, the Radon transform information is harnessed to facilitate inter-frame integration. Compared with the existing methods, the proposed algorithm attains remarkable target detection performance with lower computational complexity. A series of simulations and experimental data verify the effectiveness of the proposed algorithm.