High - Speed Target Detection Of Missile - Borne Radar

With the development of information technology and aircraft, ultra high-speed target detection has become a critically important researching content for radar detecting technology. During the accumulation process, range migration and time varying Doppler frequency, caused by target’s ultra high-speed movement, influent energy integration and detection. This paper based on a project analyzes the causes of across range unit and across Doppler unit, and discusses the solutions. The paper mainly discusses,Firstly, the chirped pulse Doppler radar has the advantage of far detection distance, high precision and high resolution. Target echo models are built to analyze range unit migration and Doppler spread.Secondly, to solve range migration, sinc interpolation, DFT-IFFT and CZT-IFFT are methods that can realize Keystone Transform. Comparisons among them show CZT-IFFT has the least computation. Radon-Fourier transform is also discribed, which can correct range migration, and combining with CZT transform can simplified calculation. In addition to these two method, the envelop interpolate and shift compensation method is described as well.Thirdly,to solve Doppler spread, three methods to correct Doppler spread are described. It first discusses the Dechirp and RWT algorithm, and then simplifies the realization of RWT algorithm through Derivation. In addition to these two methods, the segmentation acceleration compensation method is proposed. By using this method, the calculation can be reduced.Fourthly, range-Doppler joint compensation by using generalized Radon-Fourier transform is described. Due to the large calculation of GRFT search, combining segmentation acceleration compensation, GRFT algorithm can be improved.Finally, based on the project, radar parameters are designed and select the appropriate algorithm for hardware implementation.