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Frequency-varying signal two-dimensional direction finding method using rotation of two sensors

A sensor and frequency-changing technology, applied in the field of two-dimensional direction finding of frequency-varying signals, can solve the problems of time-consuming convergence, inability to process frequency-varying signals, and not considering the signal-to-noise ratio of different sampling data, etc., to achieve time-saving convergence and iterative calculation time saving effect

Active Publication Date: 2019-01-25
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a two-dimensional direction-finding method using frequency-varying signals rotated by two sensors, which can achieve high-precision two-dimensional direction-finding by only using the amplitude and phase information collected by the two sensors and the receiver. The purpose is to solve the technical problems of prior art phase ambiguity resolution, time-consuming iterative calculation, time-consuming convergence, inability to process frequency-varying signals, and failure to consider the signal-to-noise ratio of different sampling data

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  • Frequency-varying signal two-dimensional direction finding method using rotation of two sensors

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[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments, and the mode of the present invention includes but not limited to the following embodiments.

[0046] The invention provides a two-dimensional direction-finding method using two-sensor rotating frequency-varying signals, comprising the following steps:

[0047] Step 1. Collect two sensors with a distance of d at different rotational positions through the receiver The phase difference ΔΦ of the two sensors at i , frequency f i , and the dimensionless signal-to-noise ratio SNR i ; said is the angle between a vector pointing to the other sensor from one of the two sensors and the x-axis; N sample points are collected, and i=1, 2,...,N.

[0048] Step 2. Calculate the likelihood function value of the complex number formed by the acquisition phase and the complex number formed by the theoretical phase; the calculation method of the likelihood function value...

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Abstract

The invention discloses a frequency-varying signal two-dimensional direction finding method using the rotation of two sensors. The frequency-varying signal two-dimensional direction finding method using the rotation of two sensors solves the following technical problems in the prior art: the phase of a solution is fuzzy; the iterative calculation is time-consuming; the convergence is time-consuming; the frequency-varying signal cannot be processed; and the signal-to-noise ratios of different signals are not considered. The frequency-varying signal two-dimensional direction finding method usingthe rotation of two sensors disclosed by the invention adopts a simple hardware architecture, uses amplitude and phase information collected by the two sensors and a receiver, and adopts steps 1 to 5, so that a two-dimension incidence angle of the frequency-varying signal is obtained efficiently and accurately for the frequency-varying signal in a rotation period; no fuzzy phase resolution is existed in the process, the iterative calculation is time-saving, and the convergence is time-saving. The sensor in the invention is an antenna or a microphone, that is, the algorithm provided by the invention is not only suitable for obtaining the incoming wave direction of an electromagnetic wave by using the antenna, but the idea can also be extended to applications such as using rotation of two antennas or microphones to obtain the incoming wave direction of a sound wave.

Description

technical field [0001] The invention belongs to the technical field of radio monitoring, and is a radio direction-finding technology. The invention relates to a two-dimensional direction-finding method of a phase interferometer, in particular to a two-dimensional direction-finding method using frequency-varying signals rotated by two sensors. Background technique [0002] The phase interferometer is a direction finding method commonly used in the current direction finding system because of its high direction finding accuracy. [0003] Phase interferometers are divided into fixed arrays and time-varying arrays. The position of the unit antenna of the fixed phase interferometer is fixed, and the incident angle information of the incoming wave is obtained through the phase difference between the units. Two-dimensional angle measurement is based on three or four antenna phase value differences to form two sets of phase difference equations to solve two unknown quantities of two...

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Application Information

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IPC IPC(8): G01S3/46
CPCG01S3/46
Inventor 左乐聂剑坤胡泽华乐铁军应钱诚王丽华
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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