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本文提出一种自适应宽带波束形成器结构,该结构应用了基于梯度的权值调整算法,以便在一组丁线性约束下(在所需观察方向的宽带方向微商约束下)使输出方差减至极小.在本文所用的一种广义旁瓣对消器结构中,有一个非自适应(一般)波束形成器与一个自适应波束形成器并联工作.其一般部分具有遵守所规定约束的宽带方向特性,而自适应通道则是由一个固定信号阻塞矩阵与一组抽头式延迟线滤波器的串接而成。阻塞是用来保证一切满足所规定约束的入射波形不会到达抽头式延迟线.所以,本文采用一种无约束最小均方功率极小化算法,以适应延迟线加权,业已证明,由于加上方向微商约束,波束形成器静态方向特性则变成与用以规定约束的相位中心位置有关.文中还提出一种选择此相位中心位置的设计准则、并介绍可用以说明此新型自适应渡束形成器性能的模拟实验.
This paper presents an adaptive broadband beamformer architecture that uses a gradient-based weight adjustment algorithm to reduce the output variance by a set of linear constraints (under the direction of the narrow-band directional derivative of the desired direction of observation) To a minimum. In a generalized sidelobe canceller architecture as used herein, a non-adaptive (normal) beamformer works in parallel with an adaptive beamformer, and its general part has a wideband direction that complies with the prescribed constraints Characteristics, and the adaptive channel is a fixed signal blocking matrix and a set of tapped delay line filter connected in series. Blocking is used to ensure that all the incident waveforms that satisfy the specified constraints do not reach the tapped delay line. Therefore, an unconstrained minimum mean square power minimization algorithm is adopted in this paper to adapt the delay line weighting. It has been proved that, Direction of the micro-business constraints, the beam direction of the static characteristics of the beam become and used to regulate the phase of the center position related to the paper also proposed a choice of this phase center position design criteria and introduced to illustrate the new adaptive beam Former performance simulation experiment.