Anti-deception-interference satellite navigation positioning method and chip

Abstract

The invention provides an anti-deception-interference satellite navigation positioning method and a chip. The method comprises the steps that a satellite radio frequency receiving module receives a positioning satellite radio frequency signal, and detects whether the power intensity of the received signal exceeds a preset threshold value or not; a satellite radio frequency signal identity recognition module preprocesses the received signals, intercepts recognizable positioning satellite signals and recognizes and distinguishes real signals and false signals; when the received signal is identified to be a real signal, the received signal is settled to obtain real position time information; and when the received signal is identified as the false signal, alarm information is sent out. According to the method, the authenticity of the signal is identified from a signal level, authenticity of upper-layer position calculation is ensured, and purposes of timely and accurately detecting and effectively resisting spoofing attacks are achieved.

Description

technical field [0001] The invention relates to the technical field of satellite positioning, in particular to an anti-spoofing and jamming satellite navigation and positioning method and a chip. Background technique [0002] When the existing navigation and positioning chip starts to work, it captures and tracks satellite signals, and calculates the location information. Its built-in security alarm function can judge whether it has suffered a spoofing attack according to whether the change of location information exceeds the preset latitude and longitude threshold. The navigation and positioning chip has the following defects: 1. It is easy to cause a high misjudgment rate in an environment with weak satellite signals. The chip determines whether it is subjected to a spoofing attack only by using the calculated positioning information as the basis for judgment. The chip only calculates the location information, and uses the calculation result combined with the threshold to...

AI Technical Summary

Problems solved by technology

[0002] When the existing navigation and positioning chip starts to work, it captures and tracks satellite signals, and calculates the location information. Its built-in security alarm function can judge whether it has suffered a spoofing attack according to whether the change of location information exceeds the preset latitude and longitude threshold. The navigation and positioning chip has the following defects: 1. It is easy to cause a high misjudgment rate in an environment with weak satellite signals

The chip only uses the calculation result combined with the threshold to make a judgment after calculating the position information. When the chip is in a complex environment such as weak satellite signals, it is easy to cause a chip judgment error due to the positioning error generated by the chip itself.

2. The complex setting of the threshold affects the accuracy of the chip to determine fraud

The chip judgment is only based on the location information after solving, and the spoofing attack is judged by setting the threshold for comparing the position change. Set different thresholds, thus greatly reducing the chip's determination accuracy

3. It only has the function of detecting spoofing attacks and cannot resist spoofing attacks

Because the chip determines that the spoofing attack is after the position is solved, the position is solved when the chip detects the spoofing attack, and the influence of the spoofing attack signal cannot be filtered out, and the real position of the carrier cannot be provided, so it cannot resist the spoofing attack

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