| 摘要: |
| 多径干扰不具备空间相关性，难以通过差分方法消除，是影响全球导航卫星系统定位精度的关键因素之一。从接收机处理的导航信号受前端带宽限制以及近距离多径干扰更需抑制两个角度出发，提出了一种基于多门延迟(MGD)结构的多径干扰抑制方法，推导了带宽受限时MGD结构的多径误差的数学表达式，以加权和非加权多径误差包络面积最小作为目标函数，优化了该结构中早迟门系数，并以典型导航信号SinBOC(10,5)为例来说明该方法的性能。结果表明：对于SinBOC(10,5)，该方法多径误差包络面积小于高分辨率相关器(HRC)方法至少15%；当前端带宽较大时，该方法对于较小和中等延迟的多径信号的抑制能力优于HRC方法。 |
| 关键词: 全球导航卫星系统 多径干扰 多门延迟 高分辨率相关器 |
| DOI： |
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| 基金项目:国家自然科学基金青年科学基金资助项目(61301144) |
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| Multipath suppression performance analysis of multiple gate delay structure for GNSS signals |
| GAN Yi-ming,ZHOU Yan-ling |
| () |
| Abstract: |
| Multipath interferences which are difficult to be eliminated through the differential method because they are not interrelated in space,affects the positioning accuracy of global navigation satellite systems(GNSS).The navigation signals in the receiver are affected by the front-end bandwidth,and the close multipath interference suppression has more practical significance.From the two aspects a multipath interference suppression method based on multiple gate delay(MGD) is proposed in this paper.The multipath error mathematical expressions of the MGD method under limited bandwidth are derived,the early-late gate coefficients of the MGD are optimized by minimizing the areas closed by the weighted and non-weighted multipath error envelopes，and the typical navigation signal SinBOC (10,5) is chosen as an example to illustrate the performance of the method.The results show that for SinBOC(10,5) the area closed by the multipath error envelopes of MGD method is less than that of the high-resolution correlator(HRC) method at least 15%,and when the front-end bandwidth is large,for the small and medium delayed multipath signal the multipath error of the MGD method is less than that of HRC method. |
| Key words: global navigation satellite system multipath interference multiple gate delay high resolution correlator |
《电讯技术》编辑部 