唯相相控阵自适应赋形收发波束形成

在大型窄带自适应相控阵列中,由于实际阵列的非理想化及处理随机分布的干扰时的各种误差,导致控制方向错误,包括控制方向角度错误和载频波动引起的错误,急剧地降低了阵列的性能。本文为减小控制方向错误,考虑在主瓣幅度波形在主瓣方向的导数为零的约束下,按最大信干噪比原则自适应地波束形成,获得优化的唯相权值,采用优化方法中的罚函数法,并结合共轭梯度和拟牛顿法来计算优化的唯相数值权向量。模拟结果表明,在相控阵列的有效自由度下,这种方法能够有效的对抗干扰,同时保持阵列的主瓣波束的幅度波形。

Shaped Transmission and Receiving Beamforming on Phase-Only Adaptive Antenna Arrays

Duo to non-idealization of the real phase-only antenna arrays and the errors caused by processing the random interferences, there are steering vector errors, including steering vector angle error and error caused by carrier frequency fluctuation, which can degrade the performance dramatically. In this paper, the shaped beamforming are exploited to lessen the steering vector errors on narrowband phase-only antenna arrays. The shaped beamforming requires the output signal to interference and noise ration (SINR) is maximized adaptively with the constraint of the first order derivative constraints of the mainbeam magnitude response with respect to the mainbeam angle equal to 0. Then the penalty function method in optimization method combined with conjugate gradient algoridim and quasi-Newton algorithm are used to get the optimum numerical phasor. The simulations show that this approach can antijam efficiently while keep the shape of the main beam magnitude response under the assumption that the interference is not beyond the antijamming freedom of phase-only antenna arrays.