【作者】 邵晨； 曾庆化； 邱文旗； 许睿；

【Author】 SHAO Chen;ZENG Qinghua;QIU Wenqi;XU Rui;Navigation Research Center, Nanjing University of Aeronautics & Astronautics;Key Laboratory of the MIIT advanced aircraft navigation,control and health management;Jiangsu University Collaborative Innovation Center for satellite communication and navigation;

【机构】 南京航空航天大学导航研究中心； 先进飞行器导航控制与健康管理工业和信息化部重点实验室； 卫星通信与导航江苏高校协同创新中心；

【摘要】 随着我国卫星导航的发展,北斗卫星导航定位系统(BeiDou Navigation Satellite System,BDS)在军用和民用领域发挥着越来越重要的作用。为了缓和导航信号频段拥挤的问题,北斗B1C信号采用二进制偏移载波(Binary Offset Carrier,BOC)调制,虽然具备更强的跟踪精度和抗多径性能,但是由于其自相关函数的多峰特性,容易导致跟踪环路发生误锁现象,这就对接收机跟踪算法提出了更高的要求。针对B1C信号中主要分量BOC(1,1)的跟踪模糊问题,本文提出了一种新型BOC(n,n)跟踪算法,首先构造新型相关函数模型消除多峰值模糊性,之后基于梯度下降迭代获取相关函数主峰值点,进一步提高伪码跟踪性能。实验结果表明,该方法相较于传统的ASPeCT方法能够取得更好的跟踪精度。更多还原

【Abstract】 With the development of China’s satellite navigation, BeiDou Navigation Satellite System is playing an increasingly important role in military and civil fields. To alleviate the problem of congestion in the navigation signal spectrum, B1 C signal adopts BOC(Binary Offset Carrier) modulation. Although the tracking accuracy and anti-multipath performance of B1 C signal are higher, the multi-peak characteristics of the autocorrelation function make the tracking loop easy to be false locked, which needs higher requirements for the tracking algorithm. Aiming at the tracking fuzzy problem of BOC(1,1), the main component of B1 C signal, a new tracking algorithm of BOC(n,n) is proposed in this paper. Firstly, a new correlation function model is constructed to eliminate the multi-peak ambiguity, and then the main peak is obtained based on gradient descent iteration to improve the tracking performance of the ranging code. The experimental results show that the proposed method can achieve higher tracking accuracy than the traditional ASPeCT method.更多还原