Array sparse method for broadband non-frequency-variable multi-beam imaging sonar
An imaging sonar, multi-beam technology, applied in radio wave measurement systems, instruments and other directions, can solve problems such as resolution
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[0072] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0073] refer to figure 1 The semicircular array shown is composed of N isotropic array elements evenly distributed on the semicircle with radius R. Considering beamforming in the far-field case, the angular frequency range of the incident broadband signal is [ω L ,ω H ], the angle between the incident signal and the diameter OA of the semicircle array is θ, and the phase reference point of the array is the center O of the array circle. Therefore, for a multi-beam semicircle array with the number of beams L, its array directivity function can be expressed as:
[0074]
[0075] Among them, the lth beam weighting coefficient vector is the weighting coefficient of the l-th beam direction on the k-th array element, a(θ) is the steering vector pointing upward by θ, is the offset angle of the kth array element relative to the reference ar...
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