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Spatial filtering method based on direction finding equipment

A technology of airspace filtering and direction finding, which is applied in directions such as radio wave direction finders, radio wave direction/deviation determination systems, space transmit diversity, etc. Problems such as the inability of equipment to separate signals, etc., to achieve high timeliness and improve efficiency

Active Publication Date: 2021-07-30
成都华日通讯技术股份有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a spatial filtering method based on direction-finding equipment, which is used to solve the problem that the direction-finding equipment in the prior art cannot perform signal separation from the signal level and the implementation method of spatial filtering in the prior art is limited by the array elements. Quantity and poor consistency of antenna amplitude gain and complex issues

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  • Spatial filtering method based on direction finding equipment
  • Spatial filtering method based on direction finding equipment
  • Spatial filtering method based on direction finding equipment

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Embodiment 1

[0040] Each element in the antenna array corresponds to a receiver, which is called a receiving channel. The role of the receiver is to convert the radio frequency signal received by the antenna into intermediate frequency IQ data for processing by the computer. For an N-element array, its corresponding N receivers can provide N channels of IQ data streams; each channel of IQ data streams can be demodulated in real time to obtain voice information or other forms of information. However, in the case where there are multiple signals of the same frequency, each IQ data stream contains information about each signal, forming the same-frequency interference. In the actual radio monitoring work, it is necessary to split the same frequency signal at the signal level, so as to separate and demodulate each signal. A kind of spatial filtering method based on direction finding equipment provided by the present invention adopts the following steps to solve this problem, combining figure ...

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Abstract

The invention discloses a spatial filtering method based on direction finding equipment. The method comprises the following steps: converting a radio frequency signal received by an antenna array into an IQ data stream of each array element; calculating a covariance matrix R of the IQ data stream, and performing direction finding on the same-frequency signal of the IQ data stream by using a spatial spectrum direction finding algorithm to obtain a direction finding result; calculating actual array manifolds corresponding to the signals in all the directionsthrough the covariance matrix and the direction finding result, wherein the actual array manifolds are vectors formed by complex gains generated by the signals in all the directions in all the array elements; calculating a synthesis coefficient matrix according to the actual array manifold corresponding to the signal in each direction; and multiplying the IQ data stream of each array element by the synthesis coefficient matrix to generate a synthesis signal. According to the invention, the requirement on hardware is low; the calculation method is high in timeliness; for the synthesis coefficient of each signal, only one time of regular updating is needed; and the interference searching efficiency in radio monitoring work is improved.

Description

technical field [0001] The invention relates to the technical field of radio monitoring, in particular to a method for airspace filtering based on direction finding equipment. Background technique [0002] Spatial filtering refers to a technology in which beamforming uses the spatial separation of signals from different directions to realize signal spatial processing when several signals superimposed together in the time domain occupy the same frequency band. In practical applications, monitoring equipment can only separate multiple radio signals through differences in the frequency domain; while direction-finding equipment can only give the direction of each signal, and cannot separate from the signal level, so it is impossible to separate each signal. Demodulate separately to determine the individual characteristics of each signal. At present, there are few monitoring and direction-finding equipment capable of airspace filtering, mainly for the following reasons: [0003...

Claims

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Application Information

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IPC IPC(8): G01S3/14G06F17/16H04B7/06
CPCG01S3/14G06F17/16H04B7/0617
Inventor 唐柯范晓辉陈曾
Owner 成都华日通讯技术股份有限公司
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