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Improved satellite navigation interference direction-finding method

A satellite navigation and direction finding technology, applied in the field of satellite navigation anti-jamming, can solve the problems of large amount of calculation, low degree of hardware integration, and occupation of hardware resources, etc. less effect

Inactive Publication Date: 2018-02-23
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

However, this method requires FFT transformation, which requires a large amount of calculation, takes up a lot of hardware resources, and has a low degree of hardware integration.

Method used

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  • Improved satellite navigation interference direction-finding method

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0015] The algorithm flow of the present invention is as figure 1 As shown, the implementation steps are as follows:

[0016] Step 1: Perform single-bit quantization on the output matrix of the single-antenna array element. The quantization process is as follows:

[0017]

[0018] Among them, x(n) is the radio frequency digital signal received by a single array element at time n; x(t) is the radio frequency analog signal.

[0019] The second step: perform FFT transformation on the single-bit quantized array output matrix x(n) of the uniform linear array, and the transformation formula is as follows:

[0020]

[0021] Where N is the number of sampling points for FFT transformation;

[0022] The third step: frequency domain detection, frequency measurement and acquis...

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Abstract

The invention provides an improved satellite navigation interference direction-finding method. According to the method, firstly, a single-antenna array element output matrix is subjected to single-bitquantization, and the single-bit quantized array output matrix of the uniform linear array is subjected to FFT (fast fourier transform) transformation; conducting the frequency domain detection and the frequency measurement, and obtaining a frequency domain sample; subjecting the fast-shot number of the fast-beat vectors of frequency domain peak values to statistical averaging treatment to obtaina self-correlation estimation; carrying out characteristic value decomposition on the self-correlation estimation, and constructing a signal subspace matrix and a noise subspace matrix; finally, searching a direction vector in the peak value of the projection of the noise subspace, and obtaining the estimation of the direction of the arrival. According to the single-bit method, the data bit widthis reduced, and the FFT transformation process is simplified. The calculation amount is greatly reduced, and occupied hardware resources are reduced. The direction finding process is greatly simplified, and the engineering implementation is easy.

Description

technical field [0001] The invention belongs to the field of satellite navigation anti-jamming and relates to a simplified direction finding method for satellite navigation jamming signals. Background technique [0002] In the process of satellite navigation anti-jamming signal processing, it is a basic problem to determine the spatial position of the jamming signal, that is, to estimate the direction of arrival (DOA). The earliest super-resolution DOA estimation method is the famous MUSIC (multiple signal classification: multiplesignal classification) method. [0003] The MUSIC method belongs to the subspace method of the characteristic structure. It is based on such a basic observation: if the number of sensors is more than the number of sources, the signal component of the array data must be located in a low-quality subspace. Under certain conditions , this subspace will uniquely determine the direction of arrival of the signal, and the direction of arrival can be precis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S19/21
CPCG01S3/14G01S19/21
Inventor 钟小敏王斌龙师彬谢斌斌张阿朋
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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