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Numerical Synthesis for Constant Beamwidth Beam Pattern with Steering-Invariance |
Xing Gao-xiang; Cai Zhi-ming |
Dept. of Electronics Engineering, Naval University of Engineering, Wuhan 430033, China |
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Abstract A steering-invariant constant beamwidth beamforming algorithm is proposed. On the basis of main-lobe shape controlling idea, the proposed algorithm uses the main-lobe on some direction as reference main-lobe, and constructs the reference beampattern whose main-lobe direction is changed with different designed main-lobe direction by parallel moving the reference main-lobe, and keeps the height of side-lobe adjusted adaptively. Some virtual interfere sources are set on the look-in domain, the proposed algorithm adjusts the intension of them iteratively and makes the designed main-lobe on arbitrary direction inosculated the reference main-lobe, then the steering-invariant constant beamwidth beampattern is obtained after some iterative calculations. It is shown by simulation that the proposed algorithm can form the steering-invariant constant beamwidth beampattern effectively under the designed main-lobe direction of ±60°.
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Received: 20 November 2007
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