Adaptive airborne MTI: an auxiliary channel approach
Adaptive airborne MTI: an auxiliary channel approach
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DOI：
10.1049/ip-f-1:19870054
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发表时间：
1987-06
影响因子：
38.3
通讯作者：
R. Klemm
中科院分区：
文献类型：
--
作者：
R. Klemm
机载雷达接收的地杂波回波的抑制基本上是一个二维滤波问题，因为杂波回波取决于两个参数（速度、方位角），而不是像地基雷达那样仅取决于速度。这需要对后向散射回波场进行二维采样（在空间和时间上），这在实践中由相干脉冲多普勒相控阵雷达来实现。已有的研究表明，NM × NM（N为传感器个数，M为回波个数）阶的空时杂波协方差矩阵只有N + M个杂波特征值（而不是NM），这意味着信号向量空间可以缩小。本文介绍了一种具有机载MTI能力的自适应雷达接收机。结果表明，这种AMTI接收机近似以及理论上的最佳值，然而，计算费用大大减少。鉴于微电子学和算法（例如脉动阵列）领域的巨大进步，可以预期这种AMTI接收器在不久的将来将可实现实时应用。
The suppression of ground clutter returns received by an airborne radar is basically a two-dimensional filtering problem, because the clutter echoes depend on two parameters (velocity, azimuth) instead of velocity only as in case of ground-based radars. This requires two-dimensional sampling (in space and time) of the backscattered echo field, which in practice is fulfilled by a coherent pulse Doppler phased array radar. Previous studies have shown that the space-time clutter covariance matrix of the order NM × NM (N is the number of sensors, M the number of echoes) has only N + M clutter eigenvalues (instead of NM), which means that the signal vector space can be reduced. In the paper an adaptive radar receiver with AMTI (airborne MTI) capability is shown and discussed. It is shown that this AMTI receiver approximates well the theoretical optimum; however, the computational expense is drastically reduced. In view of the dramatic progress in the field of microelectronics and algorithms (e.g. systolic arrays), one can expect that such AMTI receivers will be realisable for real-time applications in the near future.