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Doppler wireless direction-finding system

A radio direction finding and Doppler technology, applied in the field of Doppler radio direction finding systems, can solve the problems of poor stability, complicated construction of Doppler direction finding systems, and high system cost, and achieve good stability, low cost, Build simple effects

Inactive Publication Date: 2007-09-19
BEIJING UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of complex Doppler direction finding system construction, poor stability and high system cost under the above circumstances, the present invention provides a single-channel Doppler that eliminates the adverse effects of modulation information and noise on Doppler direction finding results. radio direction finding system

Method used

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Examples

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] The antenna array 10 is composed of N dipoles, which rotate clockwise (or counterclockwise) with a certain direction (such as the true north direction) as a reference direction, and the N dipoles are evenly distributed on a circle with a radius of R , the angle between each dipole and the reference direction is α=360n / N (where n is the dipole number, n=0, 1, 2...N-1), and each dipole and The circumferential planes are perpendicular, and N is a positive integer divisible by 4. The radio receiver 2 is a single-channel receiver with controllable IF bandwidth at least with the functions of AGC, IF output interface and remote control interface (RS232 or USB). The threshold level of the comparator 3 is greater than the maximum value of the instantaneous value of the background noise of the radio receiver. Two types of comparator logic: when the comparator 3 input ...

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Abstract

The invention relates to a doppler wireless direction-finding system, pertains to wireless direction-finding field, consists of electron switch, wireless receiver, comparator, intermediate frequency filter, frequency discriminator, programmable narrow-band filter, A / D converter, direction-finding control single chip processor, PC and array antenna. The output terminal of electron switch is connected with the input terminal of wireless receiver, the output terminal of wireless receiver is connected with the input terminal of comparator; the comparator may convert the analog intermediate frequency signal from wireless receiver into the shared frequency square wave, the intermediate frequency filter may fulfill the band-pass filtering for the square wave from comparator, after frequency discriminated by frequency discriminator, narrow-band filtering fulfilled by the programmable narrow-band filter, and A / D converted, the analog sine wave signal from the wireless incoming wave direction may be converted into digital quantity, the direction-finding control single chip processor may calculate the direction-finding accuracy of wireless incoming wave. This single-channel doppler direction-finding system may find the direction of adjusted wireless signals, simplify the configuration of direction-finding system, high stability, and relative low cost.

Description

technical field [0001] The invention relates to a Doppler radio direction finding system which utilizes the Doppler effect to determine the incoming wave direction of radio signals, is a system for completing radio direction finding by using a phase method, and belongs to the field of radio direction finding. Background technique [0002] At present, most direction-finding systems using the Doppler direction-finding method use electronic switches to switch several dipole antennas evenly distributed on the circumference at high speed, so that the RF signal output by the electronic switch produces a Doppler frequency shift. Thus, the direction of arrival of the radio signal can be obtained, that is, the direction. If the incoming wave is an unmodulated constant-amplitude oscillating high-frequency signal, the processing of the signal and the calculation of the directional angle are very simple; but most of the radio signals in the sky are modulated signals, and the existence o...

Claims

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Application Information

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IPC IPC(8): G01S3/14
Inventor 赛景波王铁流雷飞赛卓男闫慧兰
Owner BEIJING UNIV OF TECH
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