基于加权鉴别函数的二进制偏移载波信号跟踪方法  

Weighted discriminator function based tracking method for binary offset carrier signals

作　　者：严涛[1] 王瑛[1] 曲博[1] 王国永[1] 雷文英[1] 边朗[1] YAN Tao;WANG Ying;QU Bo;WANG Guoyong;LEI Wenying;BIAN Lang(China Academy of Space Technology Xi′an,Xi′an 710100,China)

机构地区：[1]中国空间技术研究院西安分院,西安710100

出　　处：《中国空间科学技术》2018年第3期45-53,共9页Chinese Space Science and Technology

基　　金：国家自然科学基金(61627817)

摘　　要：在移除二进制偏移载波(Binary Offset Carrier,BOC)信号跟踪模糊的同时,为了保持BOC信号高的码跟踪精度,提出基于加权鉴别函数(Weighted Discriminator Function,WDF)的BOC信号无模糊跟踪方法。WDF使用非相干超前减滞后功率(Noncoherent Early Minus Late Power,NELP)鉴别器和子载波相位消除(Sub Carrier Phase Cancellation technique,SCPC)鉴别器,生成无误锁点的鉴别函数实现BOC信号跟踪。针对BOC(10,5)信号,仿真结果表明,相比于SCPC、基于伪相关函数的无模糊延迟锁定环(Pseudo correlation function based Unambiguous Delay Lock Loop,PUDLL)方法和对称脉冲模糊移除(Symmetrical Pulse Ambiguity Removing,SPAR)方法,所提WDF方法在码跟踪误差方面分别改善了2.5dB、5.5dB与8.3dB,多径误差分别降为60.4%、32.8%与38.0%。因此,WDF是一种有效的、高性能的BOC信号无模糊跟踪方法。To remove the ambiguity threat and maintain the outstanding code tracking performance of binary offset carrier （BOC） signals, an unambiguous tracking method based on weighted discriminator function（WDF） was developed. The WDF combined the noncoherent early minus late power （NELP） discriminator with the sub carrier phase cancellation technique （SCPC） discriminator to generate a discriminator function without false lock points for BOC signal tracking. Regarding BOC（10,5） signal, the simulation results show that compared with SCPC, pseudo correlation function based unambiguous delay lock loop （PUDLL） and symmetrical pulse ambiguity removing （SPAR） successively, the proposed WDF has 2.5 dB, 5.5 dB and 8.3 dB improvement in terms of code tracking error. The multipath errors of WDF method are reduced to 60.4%, 32.8% and 38.0%, respectively. Therefore, the proposed WDF is an effective BOC signal unambiguous tracking method with outstanding performance.

关 键 词：二进制偏移载波 无模糊跟踪 加权鉴别函数 码跟踪性能 全球卫星导航系统 

分 类 号：TN967.1[电子电信—信号与信息处理]