The Influence of Group Delay under GNSS Multichannel Cascade on Superposition of Zero Value
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摘要: 导航信号从卫星发射到用户接收处理通道的群时延特性会对时延估计零值产生影响。目前较为普遍的做法是将各通道零值进行简单叠加得到级联通道的零值研究了级联通道时延估计零值的叠加特性零阶群时延通道与其他通道级联时奇数阶群时延通道的零值为零其他群时延通道相互级联时若对群时延系数进行约束Abstract: There may be several channels for the navigation signal to propagate from the satellite to the user, of which the group delay characteristics influence the zero value of time delay estimation. It is common practice to simply add the zero value of each channel to obtain zero value of cascaded channel, whether the sum of the zero values of each channel is simply equal to the zero value of the cascade channel has not been studied yet. In this paper, the influence of the group delay characteristics on the zero value is analyzed quantitatively. And the superposition characteristic of the zero value of time delay estimation under the cascade channel is estimated. The result of the simulation is verified on the software receiver. The results show that when the zeroorder group delay channel is equal to zero, it satisfies the superposition characteristic too. For other situations, the zero value does not satisfy the superposition characteristic, while the zero value can be approximately to satisfy it when the group delay coefficient is constrained.
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Key words:
- Cascaded channel /
- group delay /
- zero value /
- superposition characteristic
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