摘要 :
With the broad application of satellite navigation technique in the society and economy development, the satellite navigation technique has been facing with more and more hidden dangers of being attacked in such key fields as fina...
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With the broad application of satellite navigation technique in the society and economy development, the satellite navigation technique has been facing with more and more hidden dangers of being attacked in such key fields as finance, public security, civil aviation and public rescue. In light of the vulnerability of satellite navigation receiver against replay attack in the above fields, this paper proposes several anti-replay attack techniques of low complexity, i.e., inertial positioning test, clock skew test and Doppler shift test. The simulation results show that Doppler shift test can resist replay attack effectively without additional hardware to the receiver. In addition, compared to SNR test, absolute power test and the other techniques, Doppler shift test has the advantages of low implementation difficulty and high adaptability, which can provide technical support for the security applications of satellite navigation technology in the fields of great concern.
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摘要 :
With the broad application of satellite navigation technique in the society and economy development, the satellite navigation technique has been facing with more and more hidden dangers of being attacked in such key fields as fina...
展开
With the broad application of satellite navigation technique in the society and economy development, the satellite navigation technique has been facing with more and more hidden dangers of being attacked in such key fields as finance, public security, civil aviation and public rescue. In light of the vulnerability of satellite navigation receiver against replay attack in the above fields, this paper proposes several anti-replay attack techniques of low complexity, i.e., inertial positioning test, clock skew test and Doppler shift test. The simulation results show that Doppler shift test can resist replay attack effectively without additional hardware to the receiver. In addition, compared to SNR test, absolute power test and the other techniques, Doppler shift test has the advantages of low implementation difficulty and high adaptability, which can provide technical support for the security applications of satellite navigation technology in the fields of great concern.
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摘要 :
This paper presented a method that supports multi-element signal direction finding through power augmentation after the spoofing jamming signals are despread with the local codes, which is compared with the satellite position acqu...
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This paper presented a method that supports multi-element signal direction finding through power augmentation after the spoofing jamming signals are despread with the local codes, which is compared with the satellite position acquired by ephemeris calculating. The conventional spoofing-jamming detection methods are only effective to specific spoofing jamming. This algorithm utilizes the priori knowledge that the satellite navigation receiving system already has detected a number of spoofing jamming with the high-resolution direction-finding method. The simulation results show that this algorithm has good detection performance on both active spoofing and passive spoofing.
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摘要 :
This paper presented a method that supports multi-element signal direction finding through power augmentation after the spoofing jamming signals are despread with the local codes, which is compared with the satellite position acqu...
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This paper presented a method that supports multi-element signal direction finding through power augmentation after the spoofing jamming signals are despread with the local codes, which is compared with the satellite position acquired by ephemeris calculating. The conventional spoofing-jamming detection methods are only effective to specific spoofing jamming. This algorithm utilizes the priori knowledge that the satellite navigation receiving system already has detected a number of spoofing jamming with the high-resolution direction-finding method. The simulation results show that this algorithm has good detection performance on both active spoofing and passive spoofing.
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摘要 :
Pseudolites system provide positioning service based on a ranging process similar to Global Navigation Satellite System (GNSS) that need all transmitters have consistent reference time and frequency. In airborne pseudolites naviga...
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Pseudolites system provide positioning service based on a ranging process similar to Global Navigation Satellite System (GNSS) that need all transmitters have consistent reference time and frequency. In airborne pseudolites navigation system applications, all UAVs are move continually and it is impossible to achieve real-time precision flight trajectories, which have more challenge for wireless time synchronization. This study provides a method based on direct two-way time and frequency transfer (TWTFT) link that calculate the clock difference by ranging differential delay and error compensating without UAVs' accurate position. In addition, analysis of the synchronization performance in high dynamic and jamming situation will be showed by showing the effect of pseudolites clock drift, Sagnac and unsymmetrical interference. A software simulation and hardware test results are provided.
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摘要 :
Pseudolites system provide positioning service based on a ranging process similar to Global Navigation Satellite System (GNSS) that need all transmitters have consistent reference time and frequency. In airborne pseudolites naviga...
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Pseudolites system provide positioning service based on a ranging process similar to Global Navigation Satellite System (GNSS) that need all transmitters have consistent reference time and frequency. In airborne pseudolites navigation system applications, all UAVs are move continually and it is impossible to achieve real-time precision flight trajectories, which have more challenge for wireless time synchronization. This study provides a method based on direct two-way time and frequency transfer (TWTFT) link that calculate the clock difference by ranging differential delay and error compensating without UAVs' accurate position. In addition, analysis of the synchronization performance in high dynamic and jamming situation will be showed by showing the effect of pseudolites clock drift, Sagnac and unsymmetrical interference. A software simulation and hardware test results are provided.
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摘要 :
Satellite Navigation Receiver Autonomous Integrity Monitoring (RAIM) is developed for detection and recognition of satellite faults using the redundant observation values of receiver itself. This article first makes a comparative ...
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Satellite Navigation Receiver Autonomous Integrity Monitoring (RAIM) is developed for detection and recognition of satellite faults using the redundant observation values of receiver itself. This article first makes a comparative analysis to the conventional and recently proposed RAIM fault detection and identification methods, and then points out that the conventional fault identification methods have such weakness as low fault detection probability and high false alarm probability in the situation of simultaneous multiple faulty satellites, while the recently proposed multi-satellite fault identification methods require excessive computation work though enjoy a higher detection probability. To solve these problems, a new RAIM multiple satellite fault detection and recognition method is proposed in this paper, which is characterized by high detection probability, low false alarm probability and low computation load, practicable for project implementation. Based on a simulation analysis, it turns out that this method has a higher detection probability without false alarm at all. This method requires so low computation work that it only needs 2 m times of least squares residuals fault detection and m times of fault identification in m (m > 0) faulty satellites situation, showing a very promising application value.
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摘要 :
Satellite Navigation Receiver Autonomous Integrity Monitoring (RAIM) is developed for detection and recognition of satellite faults using the redundant observation values of receiver itself. This article first makes a comparative ...
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Satellite Navigation Receiver Autonomous Integrity Monitoring (RAIM) is developed for detection and recognition of satellite faults using the redundant observation values of receiver itself. This article first makes a comparative analysis to the conventional and recently proposed RAIM fault detection and identification methods, and then points out that the conventional fault identification methods have such weakness as low fault detection probability and high false alarm probability in the situation of simultaneous multiple faulty satellites, while the recently proposed multi-satellite fault identification methods require excessive computation work though enjoy a higher detection probability. To solve these problems, a new RAIM multiple satellite fault detection and recognition method is proposed in this paper, which is characterized by high detection probability, low false alarm probability and low computation load, practicable for project implementation. Based on a simulation analysis, it turns out that this method has a higher detection probability without false alarm at all. This method requires so low computation work that it only needs 2 m times of least squares residuals fault detection and m times of fault identification in m (m ＞ 0) faulty satellites situation, showing a very promising application value.
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摘要 :
Aiming at the complicate electromagnetic environment that satellite navigation systems faced with, a multi-stage Wiener filter is designed for DOA estimation, utilizing the characteristics of the Krylov sub-space is equal to the s...
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Aiming at the complicate electromagnetic environment that satellite navigation systems faced with, a multi-stage Wiener filter is designed for DOA estimation, utilizing the characteristics of the Krylov sub-space is equal to the signal sub-space and formed by the cross-correlation vector of the observed signal and expected signal. The filter algorithm can be applied under the circumstance of signals supported by small samples, while fast convergence is realized. Therefore, the proposed filter algorithm has higher probabilities of correctly estimation and better performance in DOA estimation precision. Simulations in the environment with additive white noise indicate that the algorithm has good estimation performance and robustness when the source signal noise ratio is low and the samples of sources are inadequate. Compared with the algorithms of MUSIC, the proposed filter algorithm does not require the process of matrix inversion, resulting in reduced calculation.
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摘要 :
Aiming at the complicate electromagnetic environment that satellite navigation systems faced with, a multi-stage Wiener filter is designed for DOA estimation, utilizing the characteristics of the Krylov sub-space is equal to the s...
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Aiming at the complicate electromagnetic environment that satellite navigation systems faced with, a multi-stage Wiener filter is designed for DOA estimation, utilizing the characteristics of the Krylov sub-space is equal to the signal sub-space and formed by the cross-correlation vector of the observed signal and expected signal. The filter algorithm can be applied under the circumstance of signals supported by small samples, while fast convergence is realized. Therefore, the proposed filter algorithm has higher probabilities of correctly estimation and better performance in DOA estimation precision. Simulations in the environment with additive white noise indicate that the algorithm has good estimation performance and robustness when the source signal noise ratio is low and the samples of sources are inadequate. Compared with the algorithms of MUSIC, the proposed filter algorithm does not require the process of matrix inversion, resulting in reduced calculation.
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