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Adaptive array transient sidelobe levels and remedies

机译:自适应阵列瞬态旁瓣电平和补救措施

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摘要

The transient sidelobe level of a sidelobe canceler (SLC) is a function of the external noise environment, the number of adaptive auxiliary antennas, the adaptive algorithm used, auxiliary antenna gain margins, and the number of samples used to calculate the adaptive weights. An analytical result for the adaptive sidelobe level is formulated for the case when the adaptive algorithm is the open-loop, sampled matrix inversion (SMI) algorithm. The result is independent of whether concurrent or nonconcurrent data processing is used in the SMI algorithm's implementation. It is shown that the transient sidelobe level is eigenvalue dependent and increases proportionally to the gain margin of the auxiliary antenna elements with respect to the quiescent main antenna sidelobe level. Techniques that reduce this transient sidelobe level are discussed, and it is theoretically shown that injection independent noise into the auxiliary channels significantly reduces the transient sidelobe level. It is demonstrated that using this same technique reduces the SMI noise power residue settling time.
机译:旁瓣消除器(SLC)的瞬态旁瓣电平是外部噪声环境,自适应辅助天线的数量,使用的自适应算法,辅助天线增益裕度以及用于计算自适应权重的样本数量的函数。针对自适应算法为开环采样矩阵求逆(SMI)算法的情况,给出了针对自适应旁瓣电平的分析结果。结果与在SMI算法的实现中使用并发还是非并发数据处理无关。示出了瞬时旁瓣电平是特征值相关的,并且相对于静态主天线旁瓣电平,其与辅助天线元件的增益裕度成比例地增加。讨论了降低此瞬变旁瓣电平的技术,并且从理论上证明,将独立的噪声注入辅助通道可显着降低瞬变旁瓣电平。事实证明,使用这种相同的技术可以减少SMI噪声功率残留的建立时间。

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