GNSS (Global Navigation Satellite System) anti-forwarding deception jamming tracking channel implementation method

Abstract

The invention relates to the technical field of satellite navigation anti-interference, in particular to a GNSS (Global Navigation Satellite System) anti-forwarding deception jamming tracking channel implementation method, which comprises the following steps of: preprocessing a radio frequency front-end signal to obtain an intermediate frequency signal; after successful capturing, entering a tracking channel for normal tracking processing, and delaying the intermediate frequency signal according to a plurality of preset step lengths to obtain a plurality of paths of delay signals; judging whether the carrier phase and the code phase of the tracking channel are synchronous or not, after the carrier phase and the code phase are synchronous, performing correlation operation on a carrier sequence copied by the tracking channel and a pseudo code sequence to obtain a mixed sequence, and performing correlation accumulation on the mixed sequence and a plurality of paths of delay signals to obtain an energy sequence; a peak value in the energy sequence is obtained and compared with a threshold value, when the peak value is larger than the threshold value, the position of the peak value is recorded, and a code numerical control oscillator in a tracking channel is adjusted according to the position, so that the tracking channel tracks a real signal. The deception signal elimination effectiveness of the tracking channel is improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation anti-jamming, in particular to a tracking channel implementation method for GNSS anti-transfer deception interference. Background technique [0002] Global Navigation Satellite System (GNSS) is one of the four major satellite navigation systems, which can provide global users with services such as positioning, speed measurement, and timing, and has been deeply applied to various aspects of military and civilian fields. At present, an important factor threatening the security of GNSS is forwarding spoofing interference, which has seriously affected the use of GNSS. Due to its relatively low complexity and low cost, forwarding spoofing jamming technology has become the main threat to interfere with the use of GNSS by users. Especially in the military field, because the forwarded signal is generally more powerful than the normal signal, it reaches the user after delayed forwarding. The ...

AI Technical Summary

Problems solved by technology

However, when the power of the real signal is weak, there is a certain probability that the forwarding spoofing signal will be captured at this stage, and the forwarding spoofing signal will be locked in the tracking stage, especially in a complex environment, if the real signal is captured by buildings or If the forwarding signal is covered by mountains, etc., the deception signal will be captured and tracked. After tracking the spoofing signal, the forwarding deception signal will be mistakenly regarded as the real signal, so that the forwarding deception signal cannot be eliminated, resulting in a deviation in the final positioning.

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