Method and system for suppressing moderate double channel civil aviation ground and aviation communication constant module interference

An interference suppression, civil aviation technology, applied in transmission systems, amplification control, diversity/multi-antenna systems, etc., can solve problems such as false acquisitions, and achieve the effects of improving robustness, improving signal-to-interference ratio, and simplifying complexity

Inactive Publication Date: 2008-07-30
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

The signal used in the ground-air communication is a carrier double sideband amplitude modulation signal, and its kurtosis is less than 2, so the constant

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  • Method and system for suppressing moderate double channel civil aviation ground and aviation communication constant module interference
  • Method and system for suppressing moderate double channel civil aviation ground and aviation communication constant module interference
  • Method and system for suppressing moderate double channel civil aviation ground and aviation communication constant module interference

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Embodiment Construction

[0040] The robust dual-channel civil aviation ground-air communication constant mode interference suppression method and system of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The method of the present invention fully considers the constant mode characteristic of the common interference of the ground-air communication system, and there are very few cases of receiving two or more interferences at the same time, and the noise power is far lower than the interference and the power of the useful signal, and can be ignored , thus using a dual-channel receiving system. Starting from the fact that the interference signal and the useful signal have different signal attributes, by judging the output signal attribute of the constant modulus array and then performing the corresponding operation, it skillfully avoids the constant modulus array from capturing the AM signal by mistake, and realizes ro...

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Abstract

The invention relates to a robust twin-channel restraining method and a system for civil aviation ground-air radio CM interference. The invention comprises the steps as follows: two-way VHF signals received by a double antenna array are transformed into intermediate frequency digital signals; two-way intermediate frequency digital signals respectively act filtering extraction and orthogonal transformation; two-way complex signals after the orthogonal transformation is transmitted to a monitoring module for judging, if no interference exists, one undisturbed signal in the two-way complex signals is output, and if the interference exists, the two-way complex signals are transmitted to an adaptive interference suppression module based on a CM array for the interference suppression, thus the signal attribute output by the CM array is judged and corresponding action is adopted, the signal is directly output if the array outputs an amplitude-modulated signal, otherwise the signal is output after adaptive interference cancellation; the undisturbed signal output from the steps of the invention is demodulated, and then the high-frequency noise is filtered, the undisturbed signal then is transmitted into a D/A converter to output an aural signal. By adopting the method that the invention judges the signal attribute output by the CM array and then executes corresponding operation, the false lock of the CM array is avoided, and the robustness of an adaptive interference suppression system is effectively enhanced.

Description

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Application Information

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Owner CIVIL AVIATION UNIV OF CHINA
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