Beidou satellite user equipment receiving anti-jamming method

Abstract

The invention provides a Beidou satellite user equipment receiving anti-jamming method which solves the anti-jamming problem of a Beidou satellite navigation system in practical use and relates to the technical field of satellite navigation and intelligent antennas. The anti-jamming algorithms of space-time adaptive-filtering and Kalman filtering are combined, digital intermediate-frequency signal data is corrected by calculating the amplitude-phase error correcting weight number of a channel, a covariance matrix is estimated, an adaptive weight number is calculated, and the weight coefficient of an adaptive filter is updated. Accurate zero traps are performed to jamming on a directional diagram of a receiving antenna of Beidou satellite user equipment without knowing about the directions of jamming and signals, various kinds of jamming are inhibited, and the integrity of the signals is maintained. The invention has low calculated amount, good robustness, high anti-jamming capability and no damage to the signals.

Description

Technical field: [0001] The present invention relates to the technical field of satellite navigation and smart antenna, specifically a Beidou satellite user equipment receiving anti-jamming algorithm combined with time-space adaptive filtering and Kalman filtering, which can be used in Beidou satellite without knowing the interference and signal direction. Interference is accurately zero-notched on the direction diagram of the receiving antenna of the user equipment to suppress various types of interference and maintain signal integrity. Background technique: [0002] Because the satellites of the Beidou satellite navigation system are far away from the earth, the satellite signals are very weak (more than 20dB lower than the noise), and there is a shortcoming-susceptible to interference. At present, the most effective interference suppression method is to use adaptive antenna array technology. In satellite navigation system anti-interference, the commonly used adaptive ante...

AI Technical Summary

Problems solved by technology

[0004] 1. The power inversion method in pure airspace, the resolution of forming nulls is not high, and the satellite signal is greatly damaged while suppressing interference. Especially when suppressing strong interference, the large nulling range also attenuates useful signals, causing users The bit error rate of the equipment receiver is very high;

[0005] 2. Blind beamforming algorithm, first of all, this algorithm needs to estimate the direction of the signal when multi-satellite reception, the calculation amount is large, and the real-time performance is poor; in addition, because the deceptive interference is the same as the characteristics of the navigation satellite signal, it uses the blind self-adaptation of the navigation satellite signal characteristics Beamforming methods may fail under deceptive jamming attacks;

[0006] 3. Space-time anti-jamming algorithm, although this algorithm avoids the shortcomings of the first two methods, but the robustness is not strong, the jitter is large, and the anti-jamming performance in actual use is good and bad, very unstable

Images