电离层闪烁下GPS L2C信号处理

Y. Kou, X. Zhou, Y. Morton, Lei Zhang
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引用次数: 4

摘要

本研究的目的是开发一种软件接收机,以有效地处理电离层闪烁下的L2C GPS信号。在vc++软件接收机上实现了几种L2C信号处理算法,实现了高效的CM信号采集、从采集到跟踪的快速转换和鲁棒的CL信号跟踪。这些算法使用实时GPS信号和模拟RF信号进行了验证。实现了传统锁相环和基于卡尔曼滤波的锁相环(KFPLL)跟踪算法,并利用模拟数字中频信号对其在强闪烁条件下的性能进行了评估。我们的研究结果表明,即使在深度振幅衰落过程中出现频繁的周期滑动,接收器估计的S4指数也能很好地指示闪烁强度水平。只有在较高的信号C/N0时,才有可能对信号强度谱进行适当的表征。从稳态跟踪误差、周期跳、去趋势相位误差的标准差以及去趋势载波相位谱分析等方面分析了载波相位闪烁。与传统锁相环相比,由于其包含了先验信息,KFPLL具有更慢但更稳定的瞬态响应。测试结果表明,在存在中等水平电离层闪烁情况下,L2C软件接收机的跟踪阈值达到22dB-Hz。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Processing GPS L2C signals under ionospheric scintillations
The objective of this study is to develop a software receiver to effectively process L2C GPS signals under ionosphere scintillations. Several L2C signal processing algorithms are implemented in a VC++ software receiver with efficient CM signal acquisition, rapid transferring from acquisition to tracking, and robust CL signal tracking. These algorithms are validated using live GPS signals and simulated RF signals. A conventional PLL and a Kalman Filter based PLL (KFPLL) tracking algorithm are implemented and their performances are evaluated using simulated digital IF signals under strong scintillation conditions. Our results show that the receiver estimated S4 index serves as a good indicator of scintillation intensity level even with frequent cycle slips during deep amplitude fading. Appropriate characterization of signal intensity spectrum is only possible with relatively high signal C/N0. The carrier phase scintillation is analyzed in terms of steady state tracking errors, cycle slips, standard deviation of detrended phase errors, as well as detrended carrier phase spectral analysis. Compared to the conventional PLL, the KFPLL has a slower but steadier transient response due to its incorporation of a priori information. Our test results show that the tracking threshold of our L2C software receiver reaches 22dB-Hz in the presence of moderate-level ionosphere scintillations.
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