A direction finding method and system based on a radio frequency analog receiving system

Abstract

The invention provides a direction finding method based on a radio frequency analog receiving system. For an N-element uniform circular array antenna, the phase difference between each antenna and adjacent antennas is obtained through a phase detector, and recorded as the phase of the phase detector. difference; when the incoming wave is incident on the circular array antenna with the elevation angle of 0°, the phase difference of each phase detector is recorded as the initial phase difference; the complex number corresponding to each phase detector is constructed; according to the elevation angle and azimuth angle, k is the number of iterations , calculate the theoretical phase difference of each phase detector; introduce the vector X and the direction vector G, and combine the constructed complex numbers to calculate the elevation angle and azimuth angle of the two-dimensional incident angle with the iteration number k+1; the calculation iteration number is k+1 and the iteration The difference between the two-dimensional incident angles of order k is compared with the threshold value, and if it is less than the threshold value, it enters the output elevation and azimuth angles; otherwise, the value of k is increased by 1, and the theoretical phase difference is calculated. The advantage of the method lies in that it avoids the problems of operations such as logical judgment, phase ambiguity, and unbalanced amplitude of the input signal of the phase detector, and improves the direction finding accuracy.

Description

technical field [0001] The invention relates to the technical field of radio monitoring, in particular to a direction finding method and system based on a radio frequency analog receiving system. Background technique [0002] The interferometer direction finding system belongs to the phase direction finding system. When the incoming wave arrives at the direction finding antenna array, the different spatial positions of the different antennas lead to different phases of the signals received by each antenna unit to obtain the direction information of the incoming wave. Interferometer direction finding technology has been widely used in the field of passive direction finding because of its high precision, clear principle and wide frequency band. [0003] Due to its high direction finding accuracy, phase interferometer is a direction finding method commonly used in current direction finding systems. Because of the simple operation of the linear least squares method, the phase i...

AI Technical Summary

Problems solved by technology

[0011] (c) Insufficient application of the antenna leads to low accuracy;

[0012] (d) Unbalanced signal strength input to the phase detector

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