Estimation Method Of Radar Target Parameters Based On Interference Field

In modern warfare,the detection of target information has always been the most basic and important task of radar.Among them,the measurement of the target angle and the detection of the moving target are particularly important,which is also a hot spot for the military powers in the world to compete.The rapid development of military science and technology has put forward higher and higher requirements for radar angular measurement accuracy.The mutual game between interference and anti-jamming technology makes it more and more difficult for radar to detect moving targets in complex clutter background.Traditional angle measurement and moving target detection techniques are far from meeting today's high-precision angle measurement and detection requirements.Therefore,improving the accuracy of radar angle measurement and exploring new motion target detection methods have become the top priority of today's radar technology development.Based on the traditional single-pulse angle measurement method,this paper proposes a method of angle measurement with higher angle measurement accuracy,and based on the interference field,a detection method capable of detecting target with large tangential velocity is proposed.In the first aspect of this paper,a new angle measurement method is proposed,which improves the accuracy of angle measurement greatly compared with the traditional monopulse method.Firstly,the angle measurement model of two radars is established,and two radars emit electromagnetic waves of the same frequency.Controlling the time of two radar transmitting electromagnetic wave,the two radar transmitting signals can reach the target at the same time.The transmitted signals of the two radars form a stable interference field in an equidistant ring consisting of the 3 d B beam width of the target to be estimated.Two different initial phases are set for the transmitted signals of the two radars,so that the main radar receives two different echoes.The sum and difference signals are formed in the sum and difference channels of the main radar by processing the two kinds of echo signals received by the main radar,and then the azimuth or elevation angle of the target is estimated by combining the traditional monopulse angle measurement method.In the second aspect of this paper,a new method of moving target detection is proposed.Compared with the traditional method of moving target detection,this method can detect moving targets with large tangential velocity relative to radar.Traditional moving target detection methods can only detect targets with larger radial velocity relative to radar,but can not detect targets with larger tangential velocity relative to radar.In this paper,a new method of moving target detection is proposed,which can be used to detect targets with larger tangential velocity relative to radar.When the target with larger tangential velocity moves in the interference field,the amplitude of the echo signal changes with time.The echo signal received by radar at different time is cancelled,and the clutter is cancelled,leaving only the echo signal from the target.This method can effectively detect the target moving in tangential direction relative to the radar.The correctness of the angle measurement method based on the interference field and the moving target detection method is verified by computer simulation experiments.The accuracy of single-pulse angle measurement is improved,and a new idea is provided for the detection of large tangential velocity moving targets.It lays a good theoretical foundation for the calculation of the angle-based method based on the interference field and the moving target detection method.