Abstract:Aiming at the problem that the currently used civil aviation navigation communication interference detection system is affected by the overlapping of background noise and electromagnetic interference signals, resulting in inaccurate interference detection results, a design of civil aviation navigation communication interference detection system based on adaptive filtering is proposed. The multi-channel detection receiver is used, and the received result is transmitted to the upper computer through the PCI interface. Use direction finding antenna arrays to capture the amplitude and phase of signals from other antenna array elements. The electronic compass composed of three vertical magnetoresistive sensors is used to measure the electromagnetic interference in the X, Y and Z directions, and the hardware structure design is completed after A/D converter amplification processing and host detection. Calculate the output result of the system, combine the adaptive filtering processing technology, sort out the weighted vector of the adaptive filtering, completely separate the noise signal from the electromagnetic signal, and avoid noise interference. Calculate the phase difference, perform vectorization processing on it, obtain multiple groups of carrier phase differences, determine the value and direction of the interference signal, and complete the communication interference detection. It can be seen from the experimental results that in the case of co-frequency interference and adjacent frequency interference, the amplitudes of -0.2-0.4 and -0.8-0.7 of the signal fluctuation are consistent with the fluctuation amplitude of the actual interference signal, and the detection results are accurate.
