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Two-stage Neural Network based Combined interference Classification and Recognition for a GNSS receiver

Two-stage Neural Network based Combined Interference Classif...

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第十一届中国卫星导航年会

作者： Xin Zhang Guomei Zhang Hua Wang Guobing Li School of Information and Communications Engineering Xi’an Jiaotong University State Key Laboratory of Geo-information Engineering Xi’an Research Institute of Surveying and Mapping

Under the complex war environment based on Global Navigation Satellite Systems(GNSS), suppression interference and spoofing interference would be used in combination by enemy. Thus, the difficulty of

关键词： GNSS Suppression interference spoofing interference Classification and Recognition Back Propagation Neural Network

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Research of a Low Complexity spoofing Mitigation Method Based on a Moving Antenna

Research of a Low Complexity Spoofing Mitigation Method Base...

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第四届中国卫星导航学术年会

作者： Long Huang Junwei Nie Rui Ge Feixue Wang Satellite Navigation R＆D Center National University of Defense Technology

spoofing to GNSS receivers becomes to a majority threat to satellite navigations systems in civil safety critical applications. By weighing the groups of samples from a single moving antenna precisely, an equivalent adaptive beam forming antenna array is synthesized. Corresponding to the scenario that all spoofing pseudo random noise （PRN） codes are transmitted from the same source in space, the different spatial signatures of spoofing and authentic signals are analyzed. With a low complexity weighing parameters calculations algorithm, a null is steered in the direction where spoofing signals come from. This is an effective spoofing mitigation method which greatly suppresses the energy of spoofing signals in the conventional GNSS receiver procedures. And simulation results are given in the end to the valid the performance of the proposed method.

关键词： GNSS satellite navigation receiver spoofing interference spoofing mitigation

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Analyses of Anti-spoofing Threshold for GNSS Receivers

Analyses of Anti-spoofing Threshold for GNSS Receivers

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第三届中国卫星导航学术年会

作者： Long Huang1, Junwei Nie, Yuanling Li, Feixue Wang 1. Satellite Navigation R&D Center, National Univ. of Defense Technology, Changsha, China

spoofing to satellite navigation receivers refers to the interference by re-radiating the authentic signals or generating similar spoofing signals, which can conduct effective interference with lower power than conventional interference technologies. Since the traditional satellite navigation systems like GPS and GLONASS didn’t consider the impact of spoofing, the only way to improve the anti-spoofing capabilities is to develop some anti-spoofing techniques in the GNSS receivers. This paper analyze the invade process of spoofing signals into the receiver code tracking loops, and conclude the relationship between the receiver anti-spoofing threshold and the loop bandwidth and the early-late space of the DLL. Analyze results shows that by optimizing the code tracking loop parameters, the receiver anti-spoofing threshold can be improved greatly. In the end, the conclusion above is tested and verified by software-receiver simulation.

关键词： GNSS satellite navigation receiver spoofing interference antispoofing threshold

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Analyses of Ratio Test Technique for Satellite Navigation Receivers Anti-spoofing

Analyses of Ratio Test Technique for Satellite Navigation Re...

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第五届中国卫星导航学术年会

作者： Long Huang Weihua Mou Guangfu Sun Feixue Wang Satellite Navigation R＆D Center National University of Defense Technology

ISBN: (纸本)9783642547362

An effective method to attack GNSS receivers tracking the authentic satellite is to make the code phase of spoofing signals relatively slipping respect to the corresponding authentic ones. In this paper, a detection technique based on ratio test of correlation peak is proposed to the auto-aligned synthesis spoofing mode. By analyzing the distortion process of correlation peak, the maximum of the ratio test result and its position are calculated, and setting the threshold of ratio test accordingly. Simulation results show that the proposed ratio test method could achieve a detection probability of 90% with a false alarm probability of 5%, and could also avoid false alarm induced by multipath and signal fluctuations.

关键词： GNSS satellite navigation receiver spoofing interference ratio test anti‐spoofing.

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