Adaptive antenna interference detection system and method

Abstract

The invention discloses an adaptive antenna interference detection system and method. The system comprises an adaptive antenna for receiving radio frequency signals; a low-noise amplifier used for amplifying weak signals received by the antenna; a single-pole multi-throw switch for selecting one channel of the signals in sequence to form branch signals; mixers for performing down conversion of the radiofrequency signals to the intermediate frequency; a local oscillator for generating signals with a fixed frequency; amplifiers for amplifying the intermediate-frequency signal power; electrically-tunable band-notch filters for changing the band-notch frequency through electric signals and filtering any specified frequency point in a fixed frequency band; an analog correlator for outputting 0 if two input signals are not correlated and outputting correlated signals if the two input signals are correlated; an analog-to-digital converter for converting analog signals to digital signals; a digital signal processing module for calculating and outputting control signals; an amplitude modulation phase shifter for performing amplitude phase control on reception channels; and a combiner for combining input signals of a plurality of channels together for output. According to the system, the structure is simple, the cost is low, and the sensitivity is high.

Description

technical field [0001] The invention relates to the technical field of radar communication and anti-interference, in particular to an adaptive antenna interference detection system and method. Background technique [0002] Communication antennas generally need to cover a wide area, but due to the presence of strong interference signals in certain directions, the entire receiver may not work normally. Therefore, it is necessary to detect the source direction of the interference signal and adaptively locate the A zero point of the pattern is formed in the interference direction, so that the interference signal cannot enter the receiver. The methods for detecting the direction of interference signals can be mainly divided into analog and digital methods. Due to the wide bandwidth required by modern communication systems, digital methods are limited in many systems because they cannot handle too wide a bandwidth. The method of analog correlation processing has the advantages o...

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Problems solved by technology

[0004] However, the above-mentioned system has the following disadvantages: (1) the local oscillator is a frequency hopping source or a local oscillator modulated by pseudo-noise, and the cost is relatively high; (2) since the frequency of the local oscillator is not fixed, the intermediate frequency bandwidth is twice the RF bandwidth, Correlation processing sensitivity will be lower, so the design requirements of the correlator are higher

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