Round array phase interferometer two-dimensional (2D) direction-finding method based on virtual base line

A phase interferometer and virtual baseline technology, which is applied in the field of two-dimensional direction finding of circular array phase interferometers, can solve the problems of difficult to guarantee the accuracy of direction finding, large amount of calculation, limited use range, etc.

Inactive Publication Date: 2012-04-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] Aiming at the technical problems that the range of use is limited or the amount of calculation is large, and the accuracy of direction finding is difficult to guarantee

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  • Round array phase interferometer two-dimensional (2D) direction-finding method based on virtual base line
  • Round array phase interferometer two-dimensional (2D) direction-finding method based on virtual base line
  • Round array phase interferometer two-dimensional (2D) direction-finding method based on virtual base line

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Embodiment Construction

[0042] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] For the convenience of description, the following definitions are first made:

[0044] Phase interferometer direction finding: Phase interferometer direction finding refers to the method of calculating the signal arrival direction according to the measured spatial phase difference between the electromagnetic waves arriving at each array element.

[0045] Virtual baseline transformation: Virtual baseline transformation refers to the process of constructing the spatial phase difference between adjacent array elements in a virtual array based on the measured spatial phase difference between electromagnetic waves arriving at adjacent array elements. These virtual spatial phase differences do not exist vague.

[0046] Adjacent baseline phase difference vector: Adjacent baseline phase difference refers to the spatial phase dif...

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Abstract

The invention belongs to the technical field of communication radar, in particular relates to a broadband phase interferometer two-dimensional (2D) direction-finding method in radio monitoring. The invention provides a least square phase interferometer 2D direction-finding method based on a virtual base line defuzzification. The method comprises the following steps: firstly performing the virtualbase line conversion on a phase difference vector that is really measured on a short base line and has phase ambiguity once or several times so as to obtain a non-ambiguity virtual phase difference vector corresponding to the short base line; then orderly performing the defuzzification on the virtual phase difference vector, an adjacent base line phase difference vector and the longest base line phase difference vector, which all have ambiguity, according to the virtual phase difference vector, and finally estimating an incident direction by using the least square method according to the non-ambiguity longest base line difference vector. The defuzzification based on the virtual base line conversion provided by the invention can be used for obtaining a high-accuracy and non-ambiguity 2D direction-finding result in existence of angle-measuring ambiguity, and is an efficient 2D angle-measuring algorithm.

Description

technical field [0001] The invention belongs to the technical field of communication radar, in particular to a two-dimensional direction finding method of a circular array phase interferometer based on parallel baselines. Background technique [0002] In the existing direction finding system, the phase interferometer has the advantages of high direction finding accuracy, simple algorithm, fast speed, etc., so it has been widely used in military and civilian fields. In the military field, it can locate radiation sources such as radar, communication, and measurement and control, and can play an important role in the implementation of targeted electronic interference and military strikes; in the civilian field, it can be used for traffic control, life rescue, and radio frequency spectrum management etc. [0003] In actual direction finding, when the baseline length is greater than half a wavelength, the so-called phase ambiguity problem will be caused due to the inherent chara...

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Application Information

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IPC IPC(8): G01S3/46
Inventor 蒋林鸿贾可新程婷何子述吴奉微蒲刚李亚星张昕郑攀邹丁秋
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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