基于ASPeCT的TMBOC信号码跟踪环路

Code-Tracking Loop Design for TMBOC Signal Based on ASPeCT

二进制偏置载频调制(Binary offset carrier,BOC)调制相比传统的BPSK调制,可以实现频段共用、频谱分离和优越的抗干扰、抗多径等性能,但缺点是BOC信号相关峰存在多峰,接收机捕获时容易造成主峰错锁,从而影响导航定位性能。为解决多峰模糊问题,本文针对时分复合二进制偏置载频调制(Timemultiplexed BOC,TMBOC)信号特点,在分析传统相干鉴相器特点的基础上,提出了一种新的基于自相关旁瓣消除技术(Autocorrelation side-peak cancellation technique,ASPeCT)的TMBOC信号码跟踪环路设计方法。对该码跟踪环路的性能仿真分析和实测数据验证结果表明:相比传统非相干鉴相器,基于ASPeCT的码跟踪环路鉴相器,能够很好地解决稳定跟踪点模糊的问题。本文证明了ASPeCT技术在TMBOC软件接收机中的可用性和有效性,对BOC信号软件接收机的设计有很好的参考价值和指导意义。

Abstract： Compared with traditional BPSK modulation, binary offset carrier（BOC） modulation is widely used owing to its outstanding advantages, such as good correlation, anti-jamming property, band sharing and spectral separability, etc. However, due to the existence of multi-peaks in BOC correlation curves, it is liable to cause receiver false locked during acquisition. To resolve this problem, based on the character- istics of TMBOC signal and the traditional discriminator, a new design method for TMBOC code tracking based on autocorrelation side-peak cancellation technique（ASPeCT） is presented. It is shown from the simulation results and test data that, compared with traditional discriminator, the new design method can solve the problem of fuzzy tracking and it is available and effective when used in TMBOC software receiv- er. Furthermore, the new design method can also be a useful reference and guidance for BOC software design.