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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >A Dual-Channel Acquisition Method Based on Extended Replica Folding Algorithm for Long Pseudo-Noise Code in Inter-Satellite Links
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A Dual-Channel Acquisition Method Based on Extended Replica Folding Algorithm for Long Pseudo-Noise Code in Inter-Satellite Links

机译：卫星间链路中长伪噪声码的基于扩展副本折叠算法的双通道捕获方法

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Inter-satellite links are an important component of the new generation of satellite navigation systems, characterized by low signal-to-noise ratio (SNR), complex electromagnetic interference and the short time slot of each satellite, which brings difficulties to the acquisition stage. The inter-satellite link in both Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS) adopt the long code spread spectrum system. However, long code acquisition is a difficult and time-consuming task due to the long code period. Traditional folding methods such as extended replica folding acquisition search technique (XFAST) and direct average are largely restricted because of code Doppler and additional SNR loss caused by replica folding. The dual folding method (DF-XFAST) and dual-channel method have been proposed to achieve long code acquisition in low SNR and high dynamic situations, respectively, but the former is easily affected by code Doppler and the latter is not fast enough. Considering the environment of inter-satellite links and the problems of existing algorithms, this paper proposes a new long code acquisition algorithm named dual-channel acquisition method based on the extended replica folding algorithm (DC-XFAST). This method employs dual channels for verification. Each channel contains an incoming signal block. Local code samples are folded and zero-padded to the length of the incoming signal block. After a circular FFT operation, the correlation results contain two peaks of the same magnitude and specified relative position. The detection process is eased through finding the two largest values. The verification takes all the full and partial peaks into account. Numerical results reveal that the DC-XFAST method can improve acquisition performance while acquisition speed is guaranteed. The method has a significantly higher acquisition probability than folding methods XFAST and DF-XFAST. Moreover, with the advantage of higher detection probability and lower false alarm probability, it has a lower mean acquisition time than traditional XFAST, DF-XFAST and zero-padding.
机译：卫星间链路是新一代卫星导航系统的重要组成部分，其特征在于低信噪比（SNR），复杂的电磁干扰以及每个卫星的短时隙，这给采集阶段带来了困难。全球定位系统（GPS）和北斗导航卫星系统（BDS）中的星际链路均采用长码扩频系统。但是，由于代码周期长，因此获取长代码是一项困难且耗时的任务。传统的折叠方法，例如扩展的副本折叠获取搜索技术（XFAST）和直接平均，由于代码多普勒和副本折叠导致的额外SNR损失而受到很大限制。已经提出了双折叠方法（DF-XFAST）和双通道方法分别在低SNR和高动态情况下实现长代码捕获，但是前者容易受到代码多普勒的影响，而后者却不够快。考虑到卫星间链路的环境以及现有算法的问题，本文提出了一种基于扩展副本折叠算法（DC-XFAST）的新型长码捕获算法，称为双通道捕获方法。此方法采用双通道进行验证。每个通道都包含一个输入信号块。本地代码样本被折叠并零填充到输入信号块的长度。经过循环FFT操作后，相关结果包含两个幅度相同且指定相对位置的峰。通过找到两个最大值可以简化检测过程。验证将所有全部和部分峰都考虑在内。数值结果表明，DC-XFAST方法可以在保证采集速度的同时提高采集性能。该方法具有比折叠方法XFAST和DF-XFAST高得多的采集概率。此外，与传统的XFAST，DF-XFAST和零填充相比，它具有较高的检测概率和较低的虚警概率，具有较低的平均捕获时间。

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