Radio direction finding system and radio direction finding method

Abstract

The invention provides a radio direction finding system and a radio direction finding method. According to the radio direction finding system and the radio direction finding method, based on the framework of a double-base wire antenna, the distances between antennae which are adjacent in a certain direction are set to be larger than or equal to 0.5 time of the wave length, and the distance difference is set to be smaller than 0.5 times of the wave length; corresponding intermediate-frequency signals are generated after a double-channel homologous receiver module conducts frequency selection, filtering, amplification and down-conversion on received radio-frequency signals, and then the intermediate-frequency signals are sent to a direction finding plate to be processed; finally, differential processing is conducted on a double-base wire for direction finding. According to the radio direction finding system and the radio direction finding method, the difference method is adopted to eliminate phase ambiguity, the method is easy to realize, the realizing speed is high, and the number of occupied resources is small; due to the adoption of an orthogonal phase discriminator, errors caused by the change of the amplitudes of the received signal can be eliminated, antenna phase discrimination results are more accurate, and a measurement angle can be obtained more accurately.

Description

Technical field [0001] The invention relates to a radio direction finding system and a direction finding method, in particular to a radio direction finding system and a direction finding method suitable for antenna spacing not less than 0.5 times the wavelength. Background technique [0002] The existing single-baseline interferometer direction-finding system can only solve the situation that the antenna spacing is less than 0.5 times the wavelength. As the working frequency continues to increase, the wavelength becomes shorter and shorter. It is difficult for the antenna spacing to be less than 0.5 times the wavelength, and the antenna spacing is often not enough. The phase has no ambiguity conditions. Traditional radio direction finding systems mostly use multi-baseline ratio method to eliminate phase ambiguity in engineering realization. This realization method not only has a large amount of calculation, but also has low accuracy. [0003] The hardware structure of the traditio...

AI Technical Summary

Problems solved by technology

[0008] Through the formula (2), the phase difference of the signals received by the two antennas of A and B is finally calculated Since the formula (2) contains the amplitude information of the two signals of A and B, so The value is easily affected by the change of the signal amplitude, which makes the error of the final result larger

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