A Direction of Arrival-Range Adaptive Beamforming Method Based on Echelon Array
An adaptive beam and direction-of-arrival technology, applied in diversity/multi-antenna systems, space transmit diversity, electrical components, etc., can solve problems such as inability to distinguish signals, and achieve the best reception effect
Active Publication Date: 2021-10-22
UNIV OF SCI & TECH OF CHINA
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[0003] However, the above-mentioned adaptive beamformers all assume that there is only one desired signal in the specified direction of arrival. However, in reality, there may be multiple signal pairs with different distances from the same direction of arrival. The adaptive beamforming method can only receive all signals in the direction of arrival at the same time, and cannot distinguish each signal
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] Such as figure 1 As shown, a step array-based DOA-range adaptive beamforming method includes the following steps:
[0041] Step 1, designing a linear sub-array, arranging several sub-arrays with the same structure into a ladder structure to form a ladder array; the step 1 specifically includes the following steps:
[0042] Step 11. Design a linear sub-array. The number of array elements in the sub-array is M, and the minimum distance between adjacent array elements is d; uniform linear arrays, centrosymmetric linear arrays and non-uniform linear arrays can be used, and the aperture of the sub-array is D sub ;
[0043] Step 12. Arranging L linear sub-arrays with the same structure in a ladder structure to form a ladder array, the angle between the center line of each sub-array and the linear sub-array is ψ.
[0044] Step 2. For the des...
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The invention discloses a direction-of-arrival-distance adaptive beamforming method based on a ladder array. The method first designs a linear sub-array, and arranges several identical sub-arrays into a ladder array to form a ladder array; Direction, each sub-array performs direction-adaptive beamforming to form the reception of all signals in the specified direction of arrival; then each sub-array is regarded as an equivalent array element to form an equivalent array, and the output of each sub-array It is regarded as the received data of the equivalent array element, and the received data of all equivalent array elements is regarded as the received data of the equivalent array; finally, the specified receiving distance in the specified direction of arrival is converted into the direction of arrival of the equivalent array, Using the equivalent array to perform adaptive beamforming in this direction is equivalent to completing adaptive beamforming at a specified distance. Through the stepped array array and the secondary cascaded adaptive beamforming, the best reception of spatial signals at a specified direction of arrival and a specified distance is achieved.
Description
technical field [0001] The invention relates to the field of beamforming research in the field of array signal processing, in particular to a direction-of-arrival-distance adaptive beamforming method based on a stepped array. Background technique [0002] Beamforming is a research direction in the field of array signal processing, and a beamformer is a kind of spatial filter. It weights the data received by each array element according to certain criteria, with the purpose of retaining only the expected signal components in the received data, while effectively suppressing interference and noise. That is, it is necessary to ensure that the main lobe of the array is aligned with the direction of arrival of the desired signal, and the null trap is aligned with the direction of arrival of the interference. The adaptive beamformer adaptively adjusts the weighting coefficient of each array element according to the signal environment of the array receiving data, so as to ensure th...
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IPC IPC(8): H04B7/0426H04B7/08
CPCH04B7/043H04B7/086
Inventor 叶中付
Owner UNIV OF SCI & TECH OF CHINA