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抑制机载雷达接收的地物杂波回波基本上是两维滤波问题,因为杂波回波决定于两个参数(速度和方位),而不象地面雷达那样只决定于速度。这要求对后向散射回波场作两维(空间和时间)取样,实际上这由相干脉冲多卜勒相控阵雷达实现。以前的研究己经证明,阶数为NM×NM(N是探测头的数目,M是回波数目)的空间——时间杂波协方差矩阵只有N+M个杂波特征值(而不是NM个),这意味着,信号矢量空间可以压缩,本文发表和讨论一种具有AMTI(机载动目标显示)能力的自适应雷达接收机,可以证明,这种AMTI接收机非常近似于理论最佳接收机;然而,计算成本大大降低。从微电子学和算法(例如,收缩阵)领域飞速发展的观点上看,我们可以预期,这样的AMTI接收机在不远的将来可以实现实时应用。
Suppressing ground-based clutter echo received by airborne radars is basically a two-dimensional filtering problem because the clutter echo depends on two parameters (velocity and azimuth) and not just speed as ground radar does. This requires two-dimensional (space and time) sampling of the backscattered echo field, which is practically achieved by coherent pulsed Doppler phased array radar. Previous studies have shown that spatially-temporal clutter covariance matrices of degree NM = NM (N is the number of probes and M is the number of echoes) have only N + M clutter eigenvalues (instead of NM ), Which means that the signal vector space can be compressed. This paper presents and discusses an adaptive radar receiver with AMTI capability that proves that this AMTI receiver closely approximates the theoretical best Receiver; however, the computational cost is greatly reduced. From the point of view of rapid development in the field of microelectronics and algorithms (eg, systolic arrays), we can expect such AMTI receivers to be used in real time in the near future.