High-precision spatial spectrum direction finding method based on specific non-equidistant array structure

A non-equidistant, array-structured technology, applied in the field of spatial spectrum direction finding, can solve problems such as incomplete observation information, vulnerability to communication interference, and poor search and rescue effects, and achieve improved target recognition capabilities, increased credibility, and improved Effects of detection performance and spatial resolution

Pending Publication Date: 2022-03-25
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The stand-alone search and rescue system is simple in structure and flexible, but there are many disadvantages, such as large measurement err

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  • High-precision spatial spectrum direction finding method based on specific non-equidistant array structure
  • High-precision spatial spectrum direction finding method based on specific non-equidistant array structure
  • High-precision spatial spectrum direction finding method based on specific non-equidistant array structure

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0060] The present invention first establishes a multi-aircraft cooperative search and rescue direction finding model for the specific array structure of general aircraft, and proposes two non-equidistant direction finding schemes for the non-equidistant antenna array structure, and then analyzes the channel amplitude and phase error characteristics in the direction finding process The analysis is carried out, and the single auxiliary source correction algorithm is used to correct the error, so as to improve the direction finding accuracy in the search and rescue process. like figure 1 As shown, the specific steps are as follows:

[0061] 1. Optimizing the design of the structure of the non-equidistant array can reduce the number of continuous elements of the antenna array and increase the aperture of the array, thereby improving the direction finding ...

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Abstract

The invention discloses a high-precision spatial spectrum direction finding method based on a specific non-equal-interval array structure. The method comprises the following steps: firstly, establishing a non-equal-interval array direction finding model according to an antenna given by a general-purpose aircraft; providing two direction finding schemes for different search and rescue signal frequencies in the search and rescue system, including a multi-antenna non-equal-interval linear array direction finding scheme and a double-antenna co-prime array direction finding scheme, and determining antenna array elements in the direction finding schemes; and finally, direction finding error correction is carried out, channel amplitude and phase errors in the direction finding process are analyzed, error correction is carried out by adopting a single auxiliary information source correction algorithm, and the direction finding precision in the search and rescue process is improved. According to the invention, a high-precision spatial spectrum direction finding algorithm is adopted to carry out rapid rescue and support on persons in distress, and a technical basis is provided for an emergency rescue scheme of multi-machine cooperative direction finding search and rescue.

Description

technical field [0001] The invention belongs to the field of radio technology, and in particular relates to a spatial spectrum direction finding method. Background technique [0002] The method of using radio direction finding for aviation lifesaving has been widely used in the search and rescue of people in disaster scenarios such as maritime distress and earthquakes, and can quickly realize the location determination and rescue support of people in distress. The traditional radio direction finding method is to use the array antenna to receive radio signals, and use a specific direction finding algorithm to obtain the target's azimuth according to the electrical parameters received by different antenna elements such as amplitude, frequency or phase. [0003] In applications such as aviation lifesaving, the traditional stand-alone search and rescue system is currently used. The stand-alone search and rescue system can independently detect the location and other information o...

Claims

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/143
Inventor 赵宏伟张子春于沛涵刘洋洋
Owner NORTHWESTERN POLYTECHNICAL UNIV
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