An efficient coherent integration method for maneuvering target detection

This paper considers the coherent integration problem for detecting a high speed maneuvering target, involving range migration (RM) and Doppler frequency migration (DFM) within one coherent pulse interval. An efficient coherent integration method based on keystone transform (KT), fold factor phase compensation (FFPC) and fractional Fourier transform (FRFT), i.e., KT-FFPC-FRFT, is proposed. It can not only correct the RM effect by KT and FFPC, but also remove the DFM effect and achieve the coherent integration via selecting proper rotation angle. Compared with Radon-fractional Fourier transform (RFRFT) algorithm, the computational cost of the presented method is reduced significantly under the premise that the two methods have same coherent integration detection performance. Finally, several simulations are provided to demonstrate the effectiveness.