The Effect of Ionospheric Scintillation on Receiver
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摘要: 导航信号经过电子密度不均匀的电离层时,信号的幅度和相位会产生快速随机起伏,即为电离层闪烁。电离层闪烁对接收机信号捕获跟踪以及解调定位都有一定的影响,本文采用理论和仿真的方法分析了电离层闪烁对I,Q支路以及跟踪环路的影响。结果表明:相位闪烁对信号I,Q支路均有影响,幅度闪烁对I支路的影响比较大,在相位闪烁比较强或者幅度闪烁比较强的区域,信号更难跟踪处理。弱闪烁时锁相环(PLL)的跟踪门限约29 dBHz,延迟锁定环路(DLL)的跟踪门限约为20.2 dBHz,强闪烁时PLL跟踪门限约为32 dBHz,DLL的跟踪门限约为22 dBHz。相比而言,载波跟踪环路更加脆弱。同时得到,闪烁越强,载波发生周跳的概率越大,载噪比越高,抗闪烁能力越强。Abstract: Rapid and random temporal fluctuations in amplitude and phase of GNSS signals caused when they are propagating through irregularities in electron density of the ionosphere are called ionospheric scintillation. Ionospheric scintillation has some influence on the receiver signal acquisition, tracking, demodulation and positioning. In this paper, the influence of ionospheric scintillation on I,Q branch and tracking loop is analyzed by theoretical and simulation methods. The results show that the phase scintillation has an effect on the signal I Q branches, and the amplitude scintillation has a great effect on the I branch. In the place where the phase scintillation is stronger or the Amplitude scintillation is stronger, the signal is more difficult to track. In weak scintillation conditions, the tracking threshold of PLL is about 29 dBHz,and the tracking threshold of DLL is about 20.2 dBHz. In strong scintillation conditions, the tracking threshold of PLL is about 32dBHz,and the tracking threshold of DLL is about 22 dBHz. In contrast, the carrier tracking loop is more fragile. At the same time, the stronger the scintillation, the greater the probability of the carrier cycle slip, the higher the carrier to noise ratio, the stronger the anti-scintillation ability.
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Key words:
- Ionospheric scintillation /
- PLL /
- DLL /
- tracking threshold
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