Adaptive beamforming method for wideband transmission based on subband linear multi-constraint minimum variance criterion
An adaptive beam and minimum variance technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of complex calculation of iterative step size, increase of system load, unfavorable project implementation, etc. Strong effect of suppression of interference
Active Publication Date: 2022-06-24
HOHAI UNIV
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Since the algorithm has some problems in the initial value setting of the conjugate iteration and the calculation of the iteration step is complicated, in order to obtain the optimal solution, multiple conjugate iterations are often required, which greatly increases the amount of calculation and increases the load of the system, which is not conducive to Project implementation
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[0072] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:
[0073] A broadband transmit adaptive beamforming method based on the sub-band maximum signal-to-interference-noise ratio criterion, such as figure 1 It mainly includes the following steps:
[0074] Step 1: Design a broadband transmitting antenna array, and calculate the output signal of the broadband array. The signal x output by the mth array element m (n) satisfy the formula:
[0075]
[0076] Among them, x(n-k) means that the output discrete signal x(n) is shifted to the left by k units, and w m [k] refers to the weighted value of the k-th tap of the m-th array element, m=0,1,…,M-1, k=0,1,…,J-1, M is the total number of array elements, J is the Tapped delay line coefficients.
[0077] Step 2: Design a subband filter bank. The subband filter bank can be divided into an analysis filter bank and a synthesis filter bank. The analysis filter bank is ...
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The present invention discloses a broadband transmission adaptive beamforming method based on subband linear multi-constraint minimum variance criterion, comprising the following steps: step 1, designing a broadband transmitting antenna array, and calculating the output signal of the broadband array; step 2, designing subband Filter bank; Step 3, utilizing the analysis filter bank in the subband filter bank to complete the subband division of the broadband signal; Step 4, calculating each subband adaptive beamforming weight vector based on the subband linear multi-constraint minimum variance criterion; Step 5: Reconstruct the processed broadband signal by using the integrated filter bank in the subband filter bank. Compared with the prior art, the calculation amount of the method of the present invention is lower, a deeper zero trap can be formed in the desired direction, the interference suppression is stronger, the system performance is more stable, and it is beneficial to engineering realization.
Description
technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a broadband transmission adaptive beam forming method based on a sub-band linear multi-constraint minimum variance criterion. Background technique [0002] Adaptive arrays deployed in modern radar systems often place nulls at the receiving end to attenuate interfering signals, such as hostile jammers, unintentional EMI, or environmental clutter, etc. The antennas in this scheme typically have a uniform amplitude across the aperture. Weighted transmission to maximize main beam gain. This kind of signal processing technology at the radar receiving end has become more and more perfect, and it is more and more difficult to improve the detection performance by optimizing the radar receiving signal processing algorithm. The advantage of the trapping technique is that the antenna can impose significant bidirectional losses on the interfering signal. Most transmit nul...
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IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 沈明威王冠李建峰张琪汪晨辉
Owner HOHAI UNIV