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Coherent Detection for Weak Target Based on Frequency Phase Compensation Function

This paper addresses the long-time coherent integration detection problem for a weak maneuvering target, involving linear range migration (LRM), range curvature (RC), and Doppler frequency migration (DFM). To solve the above problems, an efficient coherent integration method based on frequency phase compensation function process (FPCFP) is proposed. By jointly searching the unknown motion parameters in velocity and acceleration domains, the FPCFP algorithm not only can eliminate LRM, RC, and DFM simultaneously, but also can realize the coherent integration. Compared with the existing algorithms, the proposed method achieves a better detection probability in a low signal-to-noise ratio (SNR) environment and ensures high computational efficiency. Several experiments are performed to verify the effectiveness of the presented approach.