Range Walk Correction and Velocity Estimation for High-Speed Target Detection

This paper considers the range walk (RW) problem for the high-speed moving target within the long coherent integration interval and proposes a new method, i.e., location rotation transform (LRT), to address the RW problem. In general, this method employs the rotation operation for the coordinate locations of echo data to eliminate the RW effect and then the Fourier transform (FT) is performed to coherently accumulate the target's energy. In comparison with the keystone transform (KT), the presented method does not require the interpolation and has better coherent integration performance. Compared with the Radon-Fourier transform (RFT), the LRT method can avoid the blind speed side lobe (BSSL). At last, numerical experiments are provided to validate the effectiveness of the proposed method.