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A Correlative Interferometer Direction Finding Method Based on Virtual Aperture Expansion

A correlative interferometer and virtual aperture technology, applied in the field of direction finding in spectrum management, can solve the problems of limited direction finding performance at low frequency, achieve good practical value, be easy to promote and use, and improve the effect of direction finding performance

Active Publication Date: 2022-03-18
中国电波传播研究所
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a correlative interferometer direction finding method with virtual aperture expansion that can solve the problem of limited performance of direction finding at low frequency in the existing correlative interferometer direction finding technology

Method used

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  • A Correlative Interferometer Direction Finding Method Based on Virtual Aperture Expansion
  • A Correlative Interferometer Direction Finding Method Based on Virtual Aperture Expansion
  • A Correlative Interferometer Direction Finding Method Based on Virtual Aperture Expansion

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Embodiment 1

[0034] In Embodiment 1, it is assumed that the basic configuration of a direction finding device is as follows:

[0035] Assume that the DF antenna has nine antenna elements (numbered 0, 1, ..., 8), where the 0th element is the reference antenna element;

[0036] Assume that the receiver has two receiving channels, one of which is connected to the reference antenna unit, and the other antenna unit is connected through the antenna selection switch;

[0037] Assume that the number of continuous sampling points is 4096;

[0038] Such as figure 1 As shown, the related interferometer direction finding method for virtual aperture expansion disclosed in this embodiment includes the following steps:

[0039] Step 1. Using a dual-channel direction-finding receiver to record the simultaneously collected IQ signals;

[0040] Step 2, calculating the second-order statistic complex-valued phase difference and the fourth-order statistic complex-valued phase difference between the referenc...

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Abstract

The invention discloses a correlation interferometer direction finding method with virtual aperture expansion, comprising the following steps: (1) using a dual-channel or multi-channel direction-finding receiver to record simultaneously collected IQ signals; (2) calculating a reference antenna unit The second-order statistic complex-valued phase difference and the fourth-order statistic complex-valued phase difference between the IQ signals collected by other antenna units other than the reference antenna unit are combined into a measurement vector; (3) Read the corresponding frequency The direction-finding database of the point is used to calculate the extended direction-finding database; (4) The measurement vector in (2) is correlated with the extended direction-finding database in (3), and the maximum correlation value is used as the estimated value of the direction. The correlative interferometer direction finding method for virtual aperture extension disclosed in the present invention is based on the second-order and fourth-order statistical information of the IQ signal collected by the direction-finding receiver, which realizes the virtual aperture extension of the direction-finding antenna and improves the correlation interferometer direction-finding method. DF performance of directional equipment at low frequencies.

Description

technical field [0001] The invention belongs to the technical field of direction finding in spectrum management, and in particular relates to a method for measuring direction of a correlation interferometer with virtual aperture expansion in the field. Background technique [0002] The direction finding of radiation sources is one of the common tasks in the field of spectrum management, which is usually implemented by direction finding antennas and receivers in fixed monitoring stations or mobile monitoring stations (mainly vehicle-mounted). [0003] The current direction finding technology system is mainly the Watson-Watt method and the related interferometer method. The Watson-Watt method is mainly suitable for the low end of the HF frequency band and the VHF frequency band, and its direction finding accuracy is limited by the out-of-roundness of the antenna unit's pattern. , and is sensitive to factors such as radio wave reflection effects and equipment errors; the correl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S3/46
CPCG01S3/143G01S3/46
Inventor 苟晓鸣郭兰图武者东唐聪
Owner 中国电波传播研究所
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