The invention relates to a spatial ultrahigh-speed maneuvered target detection method based on RMDCFT (
Radon-Modified Discrete
Chirp-
Fourier Transform). According to the method, firstly, modification is carried out based on the conventional
Radon-
Fourier transform method by using
prior information of spatial target motion parameters, searching is carried out in a known target
motion parameter range, and thus, target echo signals are extracted along the motion trajectory of a target; meanwhile, modification is also carried out based on the conventional MDCFT method, transform
processing is carried out on the extracted target echo signals, and thus, the
estimation on the
frequency modulation rate of the target can be obtained;
secondary phase of echoes is compensated based on the
estimation, coherent accumulation is carried out on the target echo signals, and target detection is realized. The method has no need of predicting or estimating the
fuzzy number of speed of the target and is applicable to the circumstances of limited CPI (
Coherent Processing Time) and low
signal-to-
noise ratio;
simulation results are compared with
processing results of MTD,
Radon-
Fourier transform, FRFT (
Fractional Fourier Transform) and RFRFT (Radon-FRFT) detection methods, experimental results show that the method provided by the invention can be used for effectively detecting the target when the CPI is limited and the
signal-to-
noise ratio is relatively low, and thus, the effectiveness of the method provided by the invention is proved.