Optimization Method of Adaptive Radio Frequency Interference Canceller for Ground-Air Communication

Abstract

The invention discloses an optimization method of an adaptive radio frequency interference canceller for ground-to-air communication, relates to the field of very high frequency communication, and solves the problem of interference, noise and the difference between different channels in a complex electromagnetic environment for the occasion of very high frequency ground-to-air communication. The effect of radio frequency interference cancellation performance. The present invention includes that the output of the coupler in the ground-air communication adaptive radio frequency interference canceller is processed by a power divider and divided into two residual signals, and the two residual signals and the two signals of the bridge 2 are input to two related The controller performs a correlation operation, and the result of the correlation operation is subjected to an adaptive control process to obtain two update weights, and the phase of the bridge 1 is adjusted through the two update weights. The invention improves the anti-noise and anti-jamming capabilities of adaptive interference cancellation, improves the effect of interference cancellation, and further improves the interference cancellation performance.

Description

technical field [0001] The invention relates to very high frequency communication, in particular to an optimization method of an adaptive radio frequency interference canceller for ground-air communication. Background technique [0002] In civil aviation VHF ground communication stations, towers, aircraft cockpits and other VHF ground-to-air communication occasions, there are usually scenarios where multiple radio stations or other radio equipment work at the same time. Due to the area of ​​the above occasions, the erection of antennas is often denser , high-power transmitting antennas, adjacent channel transmitting or co-frequency transmitting antennas will cause strong interference to the receiving antennas. This kind of interference is called co-site interference or co-site interference. The frequency points are reduced, the compatibility between the links in the system is poor, and the performance of the equipment is degraded or even invalid. [0003] At present, the en...

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Problems solved by technology

[0009] The technical problems to be solved by the present invention are: under the complex electromagnetic environment, the influence of interference and noise on the radio frequency interference cancellation performance of the VHF ground-air communication occasion, the phase difference caused by different bridges, the phase change caused by the processing delay, The phase difference between the signals of different channels after passing through the bridge will cause the phases of the signals at both ends of the second correlator to be out of sync, which will directly affect the accuracy of error detection, thereby affecting the performance of the ground-air communication adaptive radio frequency interference canceller. Cancellation ratio, cancellation time and cancellation stability

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