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Small size antenna array aperture expanding and space signal processing method

A small antenna and signal processing technology, applied in antenna arrays, antennas, space transmit diversity, etc., can solve problems such as difficulty in finding a large antenna array antenna site, increased radar station construction costs and maintenance costs, radar system calibration difficulties, etc., to overcome signal Effects of blurring, reducing the number of antenna elements and receiving channels, and improving the decoherence capability

Inactive Publication Date: 2006-05-17
WUHAN UNIV
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Problems solved by technology

Moreover, in order to effectively excite the surface waves propagating along the sea surface, the radar antenna array should be set as close to the sea water as possible. This distance usually requires 1 to 2 radar wavelengths. Under actual coastal conditions, it is not only difficult to find Antenna sites that are matched with large antenna arrays, and greatly increase the cost of radar station construction and daily maintenance costs
At the same time, because the radar antenna array is too large, its far-field range reaches several kilometers, and it is extremely difficult to calibrate the radar system.
all of these will limit the widespread application of many radars including high frequency surface wave radars

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  • Small size antenna array aperture expanding and space signal processing method
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  • Small size antenna array aperture expanding and space signal processing method

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Embodiment Construction

[0031] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0032] In order to achieve the above object, the present invention adopts an arbitrary antenna array aperture expansion and space super-resolution method, and the antenna array is set in an arbitrary array form; the entire antenna scanning area is divided into several areas, and then a certain sub-area is subdivided; through actual The relationship between the array manifold A and the extended array manifold A, obtain the array extended transformation matrix B = AA -1 ; Use the obtained array extension matrix to reconstruct the signal Z=BX of the extended array antenna (where X is the signal received by the original antenna array); perform beamforming on the data Z received by the reconstructed extended array, or use spatial high resolution The algorithm calculates the spatial super-resolution angle of arrival of the signal.

[0033] 1. Original...

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Abstract

The present invention relates to a small type antenna array aperture expanding and space signal processing method. Said method includes the following steps: making antenna array into any array form: dividing scanning area of whole antenna into several subregions, finely-dividing any one subregion of said several subregions; in the finely-divided subregion constructing actual array flow form of antenna array and array flow form of expanded array so as to further obtain the array expansion conversion matrix; utilizing the obtained array expansion conversion matrix to reconstitute the signal of expanded antenna array; then making said signal undergo the process of digital beam formation or adaptive beam formation or utilizing space high resolution algorithm to obtain space arrival angle of signal.

Description

technical field [0001] The invention relates to a small antenna array aperture expansion and space signal processing method. Background technique [0002] According to the classical antenna theory, the angular resolution of the radar is related to the antenna beam width, and the radar antenna beam width is approximately inversely proportional to the electrical length of the antenna, that is [0003] θ 3 dB ∝ λ L (radian) [0004] Among them, θ 3dB is the half-power width of the antenna beam, λ is the radar operating wavelength, and L is the length of the antenna array. When the spacing between antenna elements is about half of the operating wavelength of the radar, a large phased array antenna and a large number of receiving channels are required to obtain high angular resolution. However, in the case where the radar antenna position is limited, for examp...

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Application Information

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IPC IPC(8): G01S3/72H01Q21/00H04B7/04
Inventor 高火涛张小林陈丽
Owner WUHAN UNIV
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