Influence of repeated frequency UWB electromagnetic pulse on GPS navigation receiver
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摘要: 全球定位系统（GPS）在被广泛应用的同时，也容易受到外界的干扰，因此研究GPS导航接收机的可靠性具有重要意义。超宽带（UWB）电磁脉冲具有陡峭的上升沿和宽频谱，能够对GPS进行干扰，是一种新型导航干扰手段。通过分析重频超宽带电磁脉冲的能量谱线分布情况探究了其对GPS导航接收机的干扰机理，对重频UWB电磁脉冲对GPS接收机干扰效果与脉冲参数之间的关系进行了研究。结果表明：重频UWB电磁脉冲可以对导航接收机射频前端电路造成非线性干扰，降低接收机的捕获性能，提高脉冲场强或者重频可以增强干扰效果，甚至导致接收机失去捕获能力。Abstract: While the global positioning system (GPS) is widely used, it is also susceptible to external interference. Therefore, it is of great significance to study the reliability of GPS navigation receivers. Ultra-wideband (UWB) electromagnetic pulse has a steep rising edge and a wide spectrum, it can interfere with GPS and has become a new navigation interference method. This paper explores the interference mechanism of repeated frequency UWB electromagnetic pulses to GPS navigation receivers by analyzing their energy spectrum line distribution and studies the relationship between their interference effect on GPS receivers and the pulse parameters. The results show that repeated frequency UWB electromagnetic pulses can cause nonlinear interference to the radio frequency front-end circuit of the navigation receiver, reducing the receiver's acquisition performance. Increasing the pulse field strength or repetition frequency can enhance the interference effect and even cause the receiver to lose its acquisition ability.
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图 2 不同重频下UWB信号能量谱密度
Figure 2. UWB signal energy spectral density under different repetition frequencies
图 8 UWB电磁脉冲源(经60 dB衰减后)
Figure 8. UWB electromagnetic pulse source (after 60 dB attenuation)
图 9 无干扰时接收机捕获卫星数量(绿色)
Figure 9. Number of satellites captured by the receiver without interference (green)
图 10 不同电场强度下接收机捕获卫星数量
Figure 10. Number of satellites captured by receiver under different electric field intensity
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