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With a long synthetic aperture time, the energy of the ground moving target will be defocused due to the effect of range migration (RM) and Doppler frequency migration (DFM). This paper combines Radon transform and the modified Lv's distribution (MLVD), then proposes RMLVD to eliminate RM and estimate the motion parameters of target. It is validated that the proposed method can estimate the equivalent slant acceleration and jerk simultaneously. Besides, the proposed method can realize coherent integration with a low computational load and eliminate the Doppler ambiguity effect. The simulation results show that the proposed method has an excellent detection performance in the multiple targets or low signal-to-noise ratio (SNR) environment.

According to the problem of motion compensation in long time integration, the echo model of high speed target in phased array radar is derived, and the equation is simplified while the target distance and angle are time varying. On this basis, an signal processing algorithm based on space-time-frequency joint matched filter is proposed, and the influence of beam-forming methods on Doppler matching is analyzed. The validation of theory is verified by simulation results.

A new direction of departure (DOD), direction of arrival (DOA) and Doppler frequency estimation algorithm for non-uniform bistatic Multiple-input multiple-output (MIMO) radar is proposed. The snapshots in a coherent processing interval (CPI) also form a non-uniform sequence. Based on tensor decomposition, the factor matrices corresponding to virtual uniform arrays and virtual uniform snapshot sequence are obtained for parameters estimation. The proposed improve method further reduces the error in a noise condition. Simulation results verify the effectiveness of the proposed algorithm.