Anti-repeater deception jamming method and detection system based on FPGA

Abstract

An anti-repeater deception jamming method and detection system based on FPGA are provided. Through an FPGA design scheme, normal satellite signals are locked in a capture stage. The peak values of thesignals are detected, and all correlation peaks are found; a threshold V1 is set, the found correlation peaks are filtered, and small peaks caused by noise are eliminated; the largest and second largest peak values and the corresponding code phases and Doppler frequencies are found; a threshold V2 is set to make judgment; if the second largest peak value is smaller than the threshold V2, it is judged that there are only normal satellite signals, and the code phase and Doppler frequency corresponding to the largest peak value are locked; and if the second largest peak value is larger than thethreshold V2, it is judged that there is repeater deception jamming, and the smaller code phase and the corresponding Doppler frequency are locked. According to the invention, satellite signals are detected in the capture stage, normal satellite signals are captured if there are repeater deception jamming signals, and therefore, the purpose of anti-repeater deception jamming is achieved.

Description

technical field [0001] The invention belongs to the field of satellite signal detection, in particular to an FPGA-based anti-transfer deception interference method and a detection system thereof. Background technique [0002] With the development of electronic technology and navigation technology, the security of satellite navigation system has gradually become a concern of military and civilian users, especially the research on spoofing and anti-spoofing technology for current satellite navigation signals has become a hot spot. However, since the signal strength is very weak when it reaches the satellite navigation system receiver, it is extremely easy to be suppressed by a stronger co-channel jamming signal (or spoofing), which is usually sent by a transponder close to the receiver antenna. Unlike ordinary suppressive jamming, spoofing attacks are more threatening because the target receiver is simply unaware of the threat. The purpose of common jamming is to simply block...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the subject to be solved by the invention is to overcome the problem of wrong positioning of the receiver under the situation of forwarding deception interference, and provide a FPGA-based anti-transmission deception interference method, which is to detect satellite signals in the acquisition phase, and Capture normal satellite signals in the presence of repeating deceptive interference signals, so as to achieve the purpose of anti-repeating deception interference

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