A Grating Lobe Suppression Method and System Based on Uniform Linear Array Broadband Beamforming
A uniform line array and broadband technology, applied to antennas, electrical components, etc., can solve problems such as low universality, inapplicability of uniform line array, and difficulty in realization
Active Publication Date: 2021-01-12
SHANDONG UNIV
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Therefore, this method is only applied under specific conditions, and the universality is not high and it is relatively complicated.
[0007] Therefore, the inventor believes that most existing broadband beam grating lobe suppression schemes rely on specific antenna arrangements and complex algorithms, are not easy to implement, and are not suitable for uniform linear arrays
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Embodiment 1
[0031] Aiming at the problem that the existing broadband beam grating lobe suppression scheme relies on specific antenna arrangement and complex algorithm, which is not easy to implement and is not applicable to uniform linear arrays, this embodiment proposes a grating lobe suppression method based on uniform linear arrays. Such as figure 1 as shown,
[0032] 1. According to the bandwidth of the received signal and the required accuracy, determine the optimal array element spacing and the number of array elements;
[0033] 2. Based on the half-wavelength corresponding to different frequency points and the spacing of array elements, calculate the scanning angle θ without grating lobes at each frequency point i ;
[0034] 3. Calculate the covariance matrix R of each frequency point within the bandwidth range for the preprocessed received signal, and according to the scanning angle θ of each frequency point i , to get the low grating lobe covariance matrix R of each frequency ...
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The present disclosure discloses a grating lobe suppression method and system based on uniform linear array broadband beamforming, including: determining the spacing of array elements and the number of array elements according to the bandwidth and required precision of received signals; Half-wavelength and array element spacing, calculate the scanning angle of each frequency point without grating lobes; calculate the covariance matrix of each frequency point within the bandwidth range for the preprocessed received signal, and scan according to each frequency point The low grating lobe covariance matrix of each frequency point is obtained; the weight of each frequency point is obtained by using the adaptive beamforming algorithm through the low grating lobe covariance matrix, and the uniform linear array is performed according to the weight of each frequency point broadband beamforming. Solve the problem of grating lobes caused by beam scanning in broadband beamforming. It is suitable for uniform linear arrays and is not affected by antenna size and form.
Description
technical field [0001] The present disclosure relates to the technical field of grating lobe suppression, in particular to a grating lobe suppression method and system based on uniform linear array broadband beamforming. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The selection of array element spacing will affect the generation of grating lobes. Generally, in order to avoid grating lobes within 90°, it is required that the array element spacing is not greater than half the wavelength of the received signal. However, for broadband signals, if the array element spacing is selected to correspond to the highest frequency If the half-wavelength is less than half-wavelength, no grating lobes will be generated within the 90° range. However, due to the constraints of the physical aperture of the antenna, the selection of the array element sp...
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IPC IPC(8): H01Q3/26
CPCH01Q3/2617
Inventor 严发宝王玉玺路光陈耀武昭苏艳蕊王冰
Owner SHANDONG UNIV