采用副载波参考波形方法的GNSS双载波环多径抑制技术教程.docVIP

采用副载波参考波形方法的GNSS双载波环多径抑制技术 徐成涛1 唐小妹1黄仰博1 陈华明1王飞雪1 （国防科学技术大学 电子，湖南 长沙 410073） 摘要： 关键词：；；； 中图分类号：TN95 文献标志码：　　　文章编号： Multipath mitigation technique of GNSS double phase estimator using subcarrier reference waveform method XU Chengtao1 TANG Xiaomei1 HUANG Yangbo1 CHEN Huaming1 WANG Feixue1 (1.College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China) Abstract: Based on the strobe pulse method, the double phase estimator (DPE) was modified by introducing a strobe waveform in the prompt signal correlation process of the subcarrier phase lock loop (SPLL) integration. The modified DPE employs no additional correlators. The design of this strobe waveform in SPLL aims to enhance the multipath error mitigation performance of the DPE, and its theory is explained and analyzed. The performance of the modified DPE is characterized according to the subcarrier multipath error envelope (SMEE) and the tracking jitter. Simulation results show that, relative to conventional DPE, the waveform employed in this study respectively provides a reduction in the SMEE of 81.1% and 75.1% for a binary offset carrier (BOC) signal with a subcarrier to reference frequency ratio of 1 and a PRN code to reference frequency ratio of 1 (i.e., BOC(1, 1)) and a BOC(14, 2) signal. The proposed approach also outperforms the double estimator employing a narrow spacing in the subcarrier loop. However, the modified DPE experiences a loss of -6 dB in terms of the post-coherent signal-to-noise ratio, which impacts its tracking precision. Thus, the selection of waveform parameters involves a trade-off between the tracking performances obtained under multipath and thermal noise conditions. Above all, the proposed method is applicable to the receiving situations of multipath environment or non weak signal case. Keywords: High order Binary Offset Carrier; Double Estimator; Double Phase Estimator; SMEE; Phase multipath. 0 引言 BOC类信号是在现代化的卫星导航系统设计中引入的新型信号，其频谱具