Research On Optimization Algorithm Of Radar Wave Refraction Error Correction

Most of the modern warfare is quick-fire blitzkrieg,in order to accurately locate the enemy's assault weapon and make a comeback in a short period of time,the function of high-precision positioning and rapid detection must be realized by the defense in-service radar.However,the actual atmosphere affects the propagation of radar wave,that is,the refraction error caused by the atmosphere affects the accuracy of radar measurement and needs to be corrected in real-time.At present,the process of calculating the atmospheric refraction error takes a long time and the refraction error can't be quickly corrected.Therefore,it is an important criterion to evaluate the atmospheric refraction error correction algorithm in the engineering applications that it is necessary to achieve the requirements of radar measurement accuracy and increase the calculation speed.The purpose of this thesis is to improve the computation speed with taking various ways based on the high-precision ray tracing method,the optimal fast algorithm is determined after analyzing and comparing.Firstly,this article introduced the research status of atmospheric refraction error correction at home and abroad.In order to ensure the accuracy of atmospheric refraction error correction,the higher-precision segmented atmospheric model and the ray tracing correction method are selected after comparing and analyzing several commonly used atmospheric profile models and refraction error correction methods.Secondly,it is also the main part of this article,which is devoted to improving the calculation speed of refractive error correction from two aspects under the premise of guaranteed accuracy.The first is to propose the radio wave refraction correction optimization algorithms based on the integral method.The accuracy of refraction error correction is determined by the precision of the target height as the upper limit of the integral,so the high precision Gauss-Legendre integral and the Romberg integral are selected and integrated separately;Because of the size of the step-size affects the calculation speed,therefore by using the stepwise variable step-size method and automatic variable step-size method improves the step algorithm optimization;In addition,the way of using the virtual-height close to the true height of the target can greatly reduce computational time and obtain the improved algorithm based on virtual high;At the same time,a better integral optimization algorithm is obtained through MATLAB simulation contrast.The second is to propose the method of converting the integral calculus into the differential computation is adopted to improve the computation speed,and then the improved step algorithm of the differential method and the Runge-Kutta differential method is obtained,and the better differential optimization algorithm is obtained through the simulation analysis algorithm.Finally,through simulation and comparison experiments,the best integral optimization algorithm and the best differential optimization algorithm not only are obtained,but also they are compared to obtain the optimal algorithm of the thesis--the Romberg's equivalent earth radius virtual height method under the same conditions.The radio wave refraction error correction optimization algorithm given in this thesis not only ensures the correction accuracy but also greatly improves the calculation speed,so that the effect of high-precision and rapid refraction error correction can be achieved.This result can be directly applied to the in-service radar system and further improve the in-service radar positioning accuracy.