MGRFT-Based Coherent Integration Method for High-Speed Maneuvering Target with Range Ambiguity

Abstract

When radar detects a high-speed maneuvering target, not only will the phenomena of range migration (RM) and Doppler migration (DM) appear, but also the phenomenon of range ambiguity, which poses challenges to the traditional accumulation processing method. In this paper, we first establish the target echo model with range ambiguity based on the spatial geometric model. On this basis, we propose a coherent integration method based on the modulo generalized Radon Fourier transform (MGRFT). By performing the modulo addressing operation during the joint search of motion parameters, the proposed method can correct RM and DM and deal with the problem of trajectory breakage under range ambiguity so as to achieve the coherent integration of echo energy and effectively improve the signal-to-noise ratio (SNR). Finally, experimental results demonstrate the effectiveness of the proposed algorithm.