信道组合技术用于在位符号转换的情况下两步获取新的合成GNSS信号

K. Sun, L. Presti
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引用次数: 9

摘要

本文对下一代系统(如伽利略和GPS现代化)的新合成全球导航卫星系统(GNSS)信号的获取问题进行了讨论和分析,重点关注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,在主扩频序列的每个周期中,潜在的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存在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轴产生交叉模糊函数(CAF)峰分裂,这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方法来处理CAF峰值损伤。考虑到新合成GNSS信号中数据和导频分量分别广播的可行性,为了克服功率损耗问题和减轻CAF分峰损伤,提出了一种基于两步采集方案的非相干和差分相干信道合并技术,将数据和导频分量联合起来,恢复两个信道的全部发射功率。从统计的角度对所提出的两步信道组合采集技术进行了深入的分析。为了支持理论分析,对模拟的伽利略E1 OS信号进行了蒙特卡罗仿真活动,以评估所提出的采集技术的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Channels combining techniques for a novel two steps acquisition of new composite GNSS signals in presence of bit sign transitions
In this paper, the problem of acquiring new composite 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 the Galileo E1 Open Service (OS) signals, in each period of the primary spreading sequence the presence of a potential sign reversal can reduce the correlation gain. Moreover, the sign transition present on the block of samples being processed produces a Cross Ambiguity Function (CAF) peak splitting along the Doppler 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 method has been proposed in order to cope with the CAF peak impairments. Due to the availability of data and pilot components separately broadcast in the new composite GNSS signals, in order to overcome the power loss problem and also to mitigate the CAF peak splitting impairments, novel non-coherent and differentially coherent channels combining techniques based on two steps acquisition scheme have been proposed for jointly combining data and pilot components to recover all the transmitted power from both channels. The proposed two steps channels combining acquisition techniques have been deeply characterized from a statistical point of view. Monte Carlo simulation campaigns have been performed on the simulated Galileo E1 OS signals to evaluate the performances of the proposed acquisition techniques in order to support the theoretical analysis.
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