Low complexity keystone transform without interpolation for dim moving target detection

In conventional Pulsed Doppler (PD) radar, when the coherent accumulation time is long, range migration often occurs, which will degrade the property of radar to detect dim moving targets. Keystone transform is the commonly used method to correct range migration. On the basis of the fast implementation of Keystone transform using Chirp-Z transform (CZT), a modified algorithm combining Keystone transform with coherent integration is proposed in this paper. It has even lower complexity, and can consumedly satisfy the desire of the system´s real-time performance. Computer simulations and real data processing results are given to demonstrate the effectiveness of the proposed method.