Research On Radar Signal Processing Algorithm Based On One-dimensional Profile

Modern radar needs to get the target’s distance, speed, angle and other information.With the development of radar technology, the requirement of radar detection performanceis increasingly demanded, such as long-distance, more targets, local identification, highrange resolution, strong interference ability and so on. Stepped frequency radar is one of theradars which have the ability of high range resolution The signal which could get a highbandwidth by the pulse accumulation can achieve good range resolution. Target motioncompensation and angle information access are achieved with the one-dimensional rangeprofile by studying the stepping frequency signal in the paper.Firstly, the stepped frequency signal is introduced in the mathematical definition. Theambiguity characteristic of the signal is analyzed by using ambiguity function which is agood tool of radar signal, and it’s a theoretical basis of the velocity compensation. Then theperformance parameters and design principles of the stepped frequency signal are studied.Secondly, the pulse synthesis principle based on IFFT are introduced. The imagingprocess of a point and expansion target are simulated and analyzed. The effect of rangeprofile of one, two and three terms from target velocity and acceleration is specially studied.The step frequency signal with high bandwidth is improved by the pre-designed pulseinterval, and one phase effect on imaging is also eliminated. Then several typical velocitycompensation algorithms are studied and analyzed detailedly, and the improved stepfrequency signal is used to velocity compensation. The presented measurement method isexecuted in two steps and the target velocity roughly is firstly estimated by the FFT andthen the precise velocity is searched by the rule of the maximum burst multiplication summation. The effectiveness of the method is demonstrated by the Matlab simulation.Finally, A-SD angle measurement and conical scanning angle measurement with monopulse are introduced. How to combining with HRR profile and principle of conical scan toget angle error is studied. How to use one dimensional range profile to get angleinformation and the questions are considered in inhibiting angle glint are studied based onone dimensional range profile and mono pulse angle.