Radar coherent integration method for high-speed maneuvering targets based on sequence reversal

This paper proposes a joint algorithm based on improved time reversal transform-new range frequency reversal transform-scale-variable inverse Fourier transform (ITRT-NRFRT-SCIFT) and time reversal transform-new range frequency reversal transform (TRT-NRFRT) to solve the problems of cross-range cell migration and Doppler frequency migration in coherent integration of radar echoes from high-speed maneuvering targets. First, the slow time sequence is reversed to extract the target velocity information from the range information. Then, the NRFRT is applied to eliminate the effect of Doppler frequency migration. Fast Fourier transform (FFT) is utilized to achieve energy accumulation following TRT-NRFRT, whereas SCIFT is utilized following ITRT-NRFRT to achieve echo energy accumulation and remove the link between slow time and range frequency. Simulation experiments show that the algorithm can correct the cross-range cell migration and Doppler frequency migration of third-order moving targets without any parameter search, and obtain the radial distance and velocity information of the target with relatively low computational complexity.