一种基于加权最小二乘载频估计的单星定位算法  

A single satellite location algorithm based on weighted least square carrier frequency estimation

作　　者：朱重儒 朱立东[1] ZHU Zhongru;ZHU Lidong(National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731 China)

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731

出　　处：《空间电子技术》2021年第2期9-15,共7页Space Electronic Technology

基　　金：国家自然科学基金资助项目(编号:61871422);四川省科技重点项目(编号:2020YFH0071)。

摘　　要：随着现代电子信息技术的发展,卫星无源侦查定位技术被广泛应用,由于成本低廉,实现简单,单星定位技术脱颖而出。在单星定位技术中,载频估计的精度决定定位性能的优劣。硬件法测量载频成本较高,设计复杂,已有的软件测频方法迭代运算量大,且载频估计精度低,因此文章改进传统最小二乘测频方法,提出一种基于加权最小二乘载频估计的单星定位算法,对测频模型加权处理,消除异方差性质,使得载频估计精度提高27.20%,定位误差有效减小。此外,针对卫星轨道环境,分析了信号载频、信号时长等因素对定位结果的影响,可以从这几个方面设计特定的卫星轨道和通信信号,为提高定位精度提供新的思路。With the development of modern electronic information technology,passive detection and positioning technology of satellite has been widely applied.Due to its low cost and simple implementation,single satellite positioning technology stands out.In single satellite positioning technology,the accuracy of carrier frequency estimation determines the positioning performance.Hardware method of measuring carrier frequency needs high cost,complex design,the existing iterative computation software frequency measurement method,and the carrier frequency estimation precision is low,so improved the traditional least squares frequency measuring method,and put forward a kind of carrier frequency estimation method based on the weighted least square single satellite localization algorithm,weighted the frequency measurement model,to eliminate heteroscedasticity,makes the carrier frequency estimation accuracy is improved by 27.20%,reduce the positioning error.In addition,for the satellite orbit environment,analyzing the influence of signal carrier frequency,signal duration and other factors on the positioning results.Specific satellite orbit and communication signals can be designed from these aspects,so as to provide new methods for improving positioning accuracy.

关 键 词：单星定位 加权最小二乘法 载频估计 精度分析 

分 类 号：V443.4[航空宇航科学与技术—飞行器设计]