Parallel-baseline-based two-dimensional direction finding method of round array phase interferometer

A technology of phase interferometer and baseline, which is applied to direction finders using radio waves, radio wave direction/deviation determination systems, instruments, etc. problem, to achieve the effect of small amount of calculation and real-time guarantee

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

[0005] For the various direction finding methods in the prior art, there are technical problems that the range of use is limited or the amount of calculation is large, and the accura

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  • Parallel-baseline-based two-dimensional direction finding method of round array phase interferometer
  • Parallel-baseline-based two-dimensional direction finding method of round array phase interferometer
  • Parallel-baseline-based two-dimensional direction finding method of round array phase interferometer

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] like figure 1 The flow chart of the two-dimensional direction finding method based on the parallel baseline circular array phase interferometer is shown, and the method specifically includes the following steps:

[0037] Step 1: Select two sets of parallel baselines in the uniform circular array and , the baseline lengths are ,and , the angle between the two sets of parallel baselines is ;

[0038] Step 2: Calculate the phase difference of the first set of parallel baselines Phase difference from the second set of parallel baselines , and calculate The phase difference vector of the root longest baseline ,in is the number of array elements;

[0039] Step 3: Use the phase difference obtained in the second step and calculate:

[0040] (1)

[0041] (2)

[0042] i...

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Abstract

The invention belongs to the technical field of radio monitoring technologies, and provides a parallel baseline based method for realizing two-dimensional wideband direction finding for a phase interferometer. The method comprises the steps of: figuring out a possible fuzzy number combination of a phase difference between two groups of parallel baselines by utilizing a linear relationship among fuzzy numbers of the phase difference between the two groups of parallel baselines in a uniform round array, thereby estimating the direction cosine of a possible incident signal; subsequently, calculating the corresponding phase differences among all the longest baselines; correlating actually measured phase difference vectors of all the longest baselines of the uniform round array; finding out a phase difference vector corresponding to the maximum correlation coefficient for estimation of a theoretical phase difference vector; and acquiring non-fuzzy phase difference vectors of all the longest baselines by resolving the phase ambiguity of all the longest baselines. According to the method provided by the invention, the deficiencies of other ambiguity resolving methods can be overcome; theestimation of the direction cosine approaches a CRLB (Cremer-Rao Lower Bound), so that the direction estimation of the incident signal achieves a very high direction finding precision; in addition, the calculation quantity in the invention is less.

Description

technical field [0001] The invention belongs to the technical field of radio monitoring, in particular to a two-dimensional direction finding method of a wide-band phase interferometer in radio monitoring. Background technique [0002] Interferometer direction finding has the advantages of simple algorithm, high sensitivity, good real-time performance, and various antenna array forms, and is widely used in direction finding systems in the field of electronic reconnaissance. In order to improve the accuracy of direction finding and the ability to resist multipath effects, the antenna aperture is required to be large enough, but this will inevitably lead to ambiguity in direction finding. Therefore, in phase interferometer direction finding, the multi-valued phase, that is, ambiguity, is the key issue that affects the success of direction finding. [0003] In order to solve the above problems, various defuzzification methods have emerged. At present, the existing interferome...

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Application Information

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IPC IPC(8): G01S3/14G06F19/00
Inventor 吴奉微贾可新李亚星程婷何子述蒲刚蒋林鸿张昕郑攀邹丁秋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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