采用副载波参考波形方法的GNSS双载波环多径抑制技术

发布时间：2018-12-14 03:34

【摘要】：为了实现对高阶二进制偏移载波(BOC)信号的无模糊和抗多径接收,将码相关参考波形的闸波设计思路应用于GNSS双载波环路接收方法的副载波锁相环。在副载波锁相环中引入设计的闸波参与信号的相干积分过程,使双载波环法具备抗多径性能且不需要额外引入相关器。对该设计方法的理论和具体实现进行阐述和分析,从副载波多径误差包络和跟踪精度两方面对改进的双载波环路方法性能进行评估。仿真结果显示,采用的算法与双载波环路法相比,可以降低BOC(1,1)信号81.1%的副载波多径误差包络面积以及BOC(14,2)信号75.1%的副载波多径误差包络面积。但是,改进的双载波环路法会带来-6 dB的相干积分后载噪比损失,降低跟踪精度。因此,在闸波参数设计上,需要谨慎选择以平衡算法的多径抑制和跟踪精度性能。综合来看,该方法适用于解决非弱信号条件下及多径环境下的高阶BOC信号接收问题。
[Abstract]:In order to realize the non-ambiguity and anti-multipath reception of high-order binary offset carrier (BOC) signal, the gate design idea of code correlation reference waveform is applied to the sub-carrier phase-locked loop of GNSS dual-carrier loop receiving method. The designed sluice wave is introduced into the subcarrier phase-locked loop to participate in the coherent integration process of the signal, so that the dual-carrier loop has anti-multipath performance and no additional correlator is needed. The theory and implementation of the design method are described and analyzed, and the performance of the improved dual-carrier loop method is evaluated from the aspects of subcarrier multi-path error envelope and tracking accuracy. The simulation results show that the proposed algorithm can reduce the subcarrier multipath error envelope area by 81.1% and the subcarrier multipath error envelope area by 75.1% of the BOC (14 / 2) signal compared with the dual-carrier loop method. However, the improved dual-carrier loop method will bring about the loss of the post-carrier noise ratio of -6 dB and reduce the tracking accuracy. Therefore, in the design of gate parameters, careful selection is needed to balance the performance of multipath suppression and tracking accuracy. In general, this method is suitable for the reception of high order BOC signals under the condition of non-weak signal and multipath environment.
【作者单位】：国防科技大学电子科学与工程学院;
【基金】：国家自然科学基金资助项目(41272385) 新世纪优秀人才支持计划资助项目(NECT-11-0317)
【分类号】：TN967.1

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