A Novel Detection Method Based on Generalized Keystone Transform and RFT for High-Speed Maneuvering Target

The coherent integration problem for a space moving target with high-speed maneuvering performance is considered in this paper. The radial velocity, acceleration and jerk of the maneuvering target would result in the first-order range migration (FRM), second-order range migration (SRM) and third-order range migration (TRM) respectively within the coherent integration time. This paper proposes a novel long time coherent integration method based on generalized keystone transform (GKT) and Radon Fourier transform (RFT). Firstly, third-order and six-order keystone transform are used to correct TRM and SRM, respectively and the improved de-chirping method is utilized to compensate for the Doppler spread (DS). Then, residual range migration (RM) will be corrected by RFT. This algorithm can correct RM without knowing its motion information. The advantage of the proposed approach is that it can achieve the coherent integration under the condition of Doppler frequency ambiguity. The computational burden of the proposed method is less than that of GRFT algorithm. Finally, simulations are performed to demonstrate the validity of the proposed algorithm.