【作者】 陈佳林； 许睿； 罗凯； 黄映杰； 曾庆化；

【Author】 Jialin Chen;Rui Xu;Luo Kai;Yingjie Huang;Qinghua Zeng;College of Automation Engineering, Nanjing University of Aeronautics & Astronautics;

【机构】 南京航空航天大学；

【摘要】 本文基于北斗三代新发布的B1C信号,利用软件接收机,采用不同的信号捕获和跟踪算法,对B1C信号伪距定位性能进行测试和分析。鉴于信号接收设备成本和北斗B1C信号的信号特点,即低频分量BOC(1,1)中包含大部分信号功率的,因此本文利用常用的GPS L1 C/A窄带接收设备,针对北斗B1C信号中的BOC(1,1)信号进行测试分析。针对BOC调制的多峰性问题,本文在捕获环节使用利用自相关函数进行副峰消除的ASPeCT算法,分析比较有无ASPeCT算法的情况下B1C信号捕获星数的变化;采用ASPeCT算法以及导频/数据联合跟踪方法,比较这些方法对跟踪精度的影响。最后通过纯伪距定位对本文中采用的不同跟踪算法的结果进行定位测试,比较分析这些方法的定位精度的变化情况。实验采用接收前端采集的北斗B1C信号进行测试。初步实验结果表明,在加入ASPeCT算法后,捕获环节的捕获星数没有产生变化,但多峰性问题得到一定的改善。在采用导频和数据联合跟踪的方式下,跟踪环节载波环跟踪误差标准差平均下降30%～50%,码环跟踪误差标准差平均下降10%。通过纯伪距定位算法计算,在地心地固坐标系下定位精度达到5米,联合定位精度略好0.1m,而ASPeCT方法的定位精度则略差。更多还原

【Abstract】 Based on the B1 C signal which was currently released by BDS-3 and adopting different acquisition and tracking algorithms, this article tests and analyzes the pseudorange-only positioning performance of the B1 C signal by using software-defined receiver.In view of the signal collection equipment cost and the B1 C signal characteristic that the low frequency component BOC(1,1) contains most of signal power, this article uses the commonly used narrowband receiving device which supports GPS L1 C/A signal to test the various performance of processing the BOC(1,1)signal. Focused on the multi-peak problem of BOC modulation, by with or without using ASPeCT method,this article compares the changes in the number of acquired satellites. In the tracking stage, the ASPeCT method and pilot/data channel joint tracking method are added to compare the influence of tracking accuracy.Finally, this article tests the results of the different tracking modes used in this article by pseudorange-only positioning.In the experiment, the BDS B1 C signals are collected by the front-end. The primary results show that, by using ASPeCT method, the number of captured satellites has no change, but the multi-peak problem gets a certain improvement. With the joint tracking method, the carrier tracking error(standard deviation) is reduced by an average of 30%～50%, and the code tracking error(standard deviation) is reduced by an average of 10%.Calculated by a stand-alone pseudorange-only positioning algorithm, the positioning accuracy reaches 5 meters in the Earth-Centered Earth-Fixed Coordinate, and the joint positioning accuracy is slightly 0.1 m better,while it is slightly worse with ASPeCT method.更多还原