两步GNSS信号采集算法的差分后检测技术

K. Sun, L. Presti
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引用次数: 14

摘要

本文对下一代系统(如伽利略和GPS现代化)中微弱的全球导航卫星系统(GNSS)信号的获取问题进行了解决和分析,重点关注了由于数据信道中的导航电文和导频信道中的辅助码而导致的较高的符号反转转换率的管理问题。必须考虑到,在伽利略E1开放服务(OS)信号的情况下,在主扩频码的每个周期中,潜在的位符号反转的存在会降低相关增益。此外,在被处理的样本块上发生的符号转移会沿着采集阶段构建的搜索空间矩阵的多普勒频移轴产生交叉模糊函数(CAF)峰分裂,可能导致错误的多普勒估计。本文提出了一种新的两步获取策略,以减轻CAF峰值损害。为了克服传统采集方法的局限性,差分相干检测方案在固定信噪比(SNR)下获得了更好的采集灵敏度。差分相干检测方案采用两步采集策略,解决了位符号转换问题,在微弱信号环境下的采集灵敏度明显提高。所提出的两步差分相干采集技术的有效性和有效性将通过模拟活动在检测率和虚警率方面进行深入评估,这将通过接收者工作特征(ROC)曲线与最先进的采集方法进行比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A differential post detection technique for two steps GNSS signal acquisition algorithm
In this paper, the problem of acquiring weak Global Navigation Satellite System (GNSS) signals of the next generation systems (such as Galileo and GPS modernization) is addressed and analyzed, focusing the majority of the attention to the problem of managing the higher sign reversal transition rate due to the navigation message in the data channel and to the secondary code in the pilot channel. It must be considered that in case of Galileo E1 Open Service (OS) signals, in each period of the primary spreading code the presence of a potential bit sign reversal can reduce the correlation gain. Moreover, the sign transition occurred on the block of samples being processed produces a Cross Ambiguity Function (CAF) peak splitting along the Doppler shift axis of the search space matrix constructed during the acquisition stage and it may lead to a wrong Doppler estimate. Here, a new two steps acquisition strategy has been proposed in order to mitigate the CAF peak impairments. To circumvent the limitations of the conventional acquisition approaches, differentially coherent detection scheme has been considered to achieve better acquisition sensitivity for a fixed signal-to-noise ratio (SNR). When two steps acquisition strategy is employed in the differentially coherent detection scheme, the bit sign transition problem can be solved and much improved acquisition sensitivity can be obtained specifically in a severe weak signal environment. The validity and effectiveness of the proposed two steps differentially coherent acquisition technique will be deeply assessed with simulation campaigns in terms of detection and false alarm rates, which will be presented by means of Receiver Operating Characteristic (ROC) curves in comparison with the state-of-the-art acquisition approaches.
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