Range-Slow-Time Matched-Filter and Complex-valued Back Projection-Based 3-D Imaging algorithmFor Rapidly Spinning Targets

To resolve the problem of the 3-D imaging of rapidly spinning targets, firstly, this paper has constructed the radar imaging geometric model and acquired the echo analytical representation of the rapidly spinning target at range-slow-time domain; secondly, the MF-CVBP(matched filter and complex-valued back-projection)-based 3-D imaging algorithm is proposed. This algorithm constructs range-slow-time matched filter, by searching its parameter of radius direction of targets, the results of filter at each value of parameter are combined to acquire the 3-D target position; At the same time, considering the case of shadowing and varying backscattering coefficients and low SNR, the extended target position and false scatters will appear in the output of matched-filter due to mismatch, so the 3-D target image is reconstructed exactly after the influence of mismatch is eliminated by the complex-value back projection; thirdly, the resolving capability of matched filter is analyzed so as to determine the resolution of the position of rotating axis、radius and initial phase and the searching step of filter’s parameter; In the end, the radar imaging in the case of ideal and complicated environment is simulated and imaging results of the method of matched filter and MF-CVBP are analyzed, simulation results has proved the validity of the proposed algorithm in this paper.