方向不变恒定束宽波束图数值综合

该文提出了方向不变恒定束宽波束形成算法。该算法在主瓣控制思想的基础上，以某一指向上的波束主瓣为参考主瓣，用平移参考主瓣的方式构造主瓣位置能随波束指向变化的参考波束，旁瓣高度采用自适应方式调整。在整个观察区域内设置若干虚拟干扰源，用迭代方式不断调整干扰源强度，使任意波束指向上的波束主瓣都与相应的参考波束主瓣吻合，最终获取方向不变恒定束宽波束图。仿真实验表明，该算法能够在主波束指向60范围内形成有效的恒定束宽波束。

Numerical Synthesis for Constant Beamwidth Beam Pattern with Steering-Invariance

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°.