Target Of High-speed Motion Detection Algorithm

With the development of science and technology, the high-speed aircraft has been successfully developed, and the speed of aircraft and other aerial target has been more and more faster, the high speed moving of target has a huge impact on the pulse echo signal, and the traditional detection method is no longer applicable. To solve the problem, this paper focuses on the high-speed moving target detection method under pulsed Doppler radar, especially for the study on the correction algorithm of envelope and Doppler migration. The main work is as follows:Firstly, this paper do the modeling and simulation of echo signal, verify the phenomenon of envelop migration, analyze the causes of the envelop migration,and also studies the impact of envelope migration on the pulse accumulation.Secondly, for the envelop migration of target with constant speed, this paper studies three correction algorithms, such as Keystone transform, envelope interpolation shift compensation and frequency domain compensation algorithm, and gives the processing steps of algorithm implementation, then analyzes and simulates these thress algorithms. At the same time, this paper also analyzes and compares the computational complexity of these three algorithms, sums up the advantages and disadvantages of these algorithms.Thirdly, for the envelop migration of target with constant acceleration,this paper analyzes the echo signal characteristics, then discusses the restriction of constant speed target detection algorithm. Then studies and analyzes a generalized second Keystone transform to detect the constant acceleration moving target. Due to this algorithm has a large computational complexity, this paper gives a method of second Keystone transform combined frequency domain compensation algorithm to correct the envelop migration, the simulation result shows that the improved algorithm greatly reduces the computational complexity and improves the processing efficiency of the algorithm.Fourthly, for the Doppler migration of target with constant acceleration, analyzes the causes of Doppler migration.To solve this problem, this paper uses Wigner-Hough transform to compensate Doppler migration, and the simulation result shows that the system can detect the target exists or not by detecting the peak in a two-dimensional plane.