KEYWORDS: Satellite navigation systems, Signal generators, Signal detection, Navigation systems, Global Positioning System, Signal to noise ratio, Interference (communication), Signal analyzers
At present, the increasingly complex electromagnetic environment, the coexistence of multiple constellations and the complexity of interference signals such as adjacent frequency signals faced by mobile terminals pose a serious challenge to their navigation application experience. In this paper, the influence of adjacent frequency interference signal on GNSS positioning performance was deeply studied, and a GNSS adjacent frequency interference conducted test system was developed based on the adjacent frequency sensitivity test method. According to the system, the interference signal generator is used for simulating noise signals of adjacent frequency of GNSS satellite signals, and the carrier-to-noise ratio degradation of a tested device before and after scrambling is tested, so that the quantitative evaluation and analysis of the anti-interference performance of all GNSS modes and frequency bands supported by a mobile terminal are realized. The test results showed that the measurement accuracy of the proposed test system is better than 0.1 dB.
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