Bearing Estimation via Amplitude Comparison of Wide-band Constant Beamwidth Beams for Circular Array
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摘要: 基于圆阵恒定束宽波束输出的宽带比幅测向法，提出了针对圆阵接收宽带平面波信号的情况采用恒定束宽波束形成，然后对恒定束宽波束输出值解三元一次方程组，获得信号的入射方向估计值，并分别对频谱平坦的线性调频信号和具有特定频谱形状的模拟水下目标辐射噪声信号进行了多次仿真测向试验，且与基于常规宽带多波束系统输出的比幅方法进行了比较，结果表明，该文方法尤其在高信噪比条件下可明显改善由宽带信号通过常规宽带波束形成系统所产生的信号失真而引入的测向误差，其测向精度也优于分裂波束互谱密度法，计算机仿真验证了本文方法的有效性和实用性。Abstract: A method of wide-band beam amplitude comparison for bearing estimation is proposed. In the case of receiving wide-band plane wave signals by circular array, the estimated bearing value can be obtained by constant beamwidth beamforming and the following solution of a group of linear equations with three unknowns for the outputs of the constant beamwidth beams. The new method has smaller bearing estimation error than the wide-band beam amplitude comparison bearing estimation method based on the outputs of conventional wide-band beams of circular array. The simulation results verified the effectiveness and practicality of the proposed method
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