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Examining the Tolerance of GNSS Receiver Phase Tracking Loop Under the Effects of Severe Ionospheric Scintillation Conditions Based on Its Bandwidth
Radio Science ( IF 1.6 ) Pub Date : 2021-05-21 , DOI: 10.1029/2020rs007160
Igor Ponte Portella 1 , Alison de O Moraes 2 , Marcelo da Silva Pinho 3 , Jonas Sousasantos 3 , Fabiano Rodrigues 4
Affiliation  

This study aims to evaluate the performance of phase-locked loop (PLL) under the presence of distinct scintillation patterns in the signal. Scintillation is very common in low-latitude regions due to the ionospheric dynamics. Under strong scintillation scenario the occurrence of deep fading events is usually registered and may cause severe degradation in the communication. The investigation conducted in this study uses the amplitude scintillation index S4, the decorrelation time urn:x-wiley:00486604:media:rds21035:rds21035-math-0001, and the bandwidth urn:x-wiley:00486604:media:rds21035:rds21035-math-0002 as main parameters. The study evaluates 54 different combinations of these parameters. The results indicate that in order to minimize the occurrence of cycle slips in the output phase of the PLL, the most appropriate tracking loop bandwidth urn:x-wiley:00486604:media:rds21035:rds21035-math-0003 depends on the values of both S4 and urn:x-wiley:00486604:media:rds21035:rds21035-math-0004, which characterize the scintillation fading pattern. Simulations showed that as the S4 index increases, the automatic increment in the PLL bandwidth may not be the best choice as the performance depends on the temporal characteristics of the scintillating signal. The analysis showed that, among the configurations tested, the equivalent noise bandwidth of 10 Hz achieved the best performance overall. The investigation also showed that choosing the wrong parameter regarding the PLL bandwidth may increase the probability of cycle slip by up to 10 times during fading events.

中文翻译:

基于其带宽检查严重电离层闪烁条件影响下 GNSS 接收器相位跟踪环路的容差

本研究旨在评估在信号中存在不同闪烁模式的情况下锁相环 (PLL) 的性能。由于电离层动力学,闪烁在低纬度地区非常普遍。在强闪烁情况下,深度衰落事件的发生通常会被记录下来,并可能导致通信严重退化。本研究中进行的调查使用幅度闪烁指数 S 4、去相关时间urn:x-wiley:00486604:media:rds21035:rds21035-math-0001和带宽urn:x-wiley:00486604:media:rds21035:rds21035-math-0002作为主要参数。该研究评估了这些参数的 54 种不同组合。结果表明,为了最大限度地减少 PLL 输出相位中周跳的发生,最合适的跟踪环路带宽urn:x-wiley:00486604:media:rds21035:rds21035-math-0003取决于两个 S4urn:x-wiley:00486604:media:rds21035:rds21035-math-0004,表征闪烁衰落模式。仿真表明,随着 S 4指数的增加,PLL 带宽的自动增加可能不是最佳选择,因为性能取决于闪烁信号的时间特性。分析表明,在测试的配置中,10 Hz 的等效噪声带宽实现了最佳的整体性能。调查还表明,选择错误的 PLL 带宽参数可能会使衰落事件期间出现周跳的可能性增加 10 倍。
更新日期:2021-06-02
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