基于MATLAB傅里叶曲线拟合的天线跟踪精度评估方法  

Antenna tracking accuracy evaluation method based on MATLAB Fourier curve fitting

作　　者：屈文星 刘浩[1] 秦楚[2] 刘锦鑫 杨凡[1] Qu Wenxing;Liu Hao;Qin Chu;Liu Jinxin;Yang Fan(63788troops of the Chinese People′s Liberation Army,Weinan Shaanxi 714000,China;CAST-Xi′an Institute of Space Radio Technology,Xi′an 710100,China)

机构地区：[1]中国人民解放军63788部队,渭南714000 [2]中国空间技术研究院西安分院,西安710100

出　　处：《电子测量技术》2020年第12期91-95,共5页Electronic Measurement Technology

摘　　要：天线跟踪精度作为无线电信号监收系统指标之一,直接影响到信号监收效果,工程中常用的多项式拟合算法在算法模型上过于单一,无法满足高精度的评估效果。基于MATLAB曲线拟合运算工具,对常用的8种拟合算法进行仿真分析,傅里叶曲线拟合相比多项式拟合的两项评价参数分别优化了45.5%与27.2%。通过对某型无线电监收系统的天线记录数据进行多阶傅里叶拟合计算比较,其中4阶拟合评价参数收敛性已趋于平稳。采用4阶傅里叶拟合可将均方根误差控制在0.02以内,满足天线1/10波束宽度的指标要求,验证了傅里叶拟合方法对天线跟踪精度的评估效果。As one of the indicators of radio signal monitoring system,antenna tracking accuracy would directly affect the signal monitoring effect.Polynomial fitting algorithm which used in conventional evaluation methods is quite singular in the algorithm model to satisfy the high-precision evaluation.Based on MATLAB curve fitting operation tools,simulation analysis of eight commonly used fitting algorithms is performed.Fourier curve fitting is optimized by 45.5%and 27.2%respectively compared to the two evaluation parameters of polynomial fitting.Through multi-order Fourier fitting calculation and comparison of the antenna recording data of a certain radio monitoring system,the convergence of the evaluation parameters of the fourth-order fitting has stabilized.The use of 4th-order Fourier fitting can control the root-mean-square error within 0.02,which satisfies the antenna′s 1/10beam width index requirement,and verifies the evaluation effect of the Fourier fitting method on the tracking accuracy of the antenna.

关 键 词：天线精度 曲线拟合 傅里叶 MATLAB 

分 类 号：V557.5[航空宇航科学与技术—人机与环境工程]