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Multipath interferometry technique for airborne array calibration

机译:机载阵列校准的多径干涉测量技术

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A new technique is developed to compensate multiple-wavelength distortion in airborne antenna arrays. This approach exploits the phase information in microwave reflections from arbitrary terrain. To handle reflections incident over a broad angle, a range-Doppler preprocessor is used in each element channel to resolve wavefronts incident simultaneously from different directions. The phase information for each direction of arrival is compared between elements and processed by optimal estimators to determine the phase corrections needed to compensate the distortion. To develop the estimators, a statistical model of the complex baseband terrain reflections is developed. This is in turn used to generate conditional probability densities involving the range Doppler observations and the parameters to be estimated. These densities are subsequently used to develop minimum variance and maximum likelihood estimators. The new estimators use additional information that has not been exploited by previous techniques and therefore provide enhanced performance
机译:开发了一种新技术来补偿机载天线阵列中的多波长失真。这种方法利用了任意地形在微波反射中的相位信息。为了处理广角入射的反射,在每个元素通道中使用距离多普勒预处理器来解析同时从不同方向入射的波前。在元件之间比较每个到达方向的相位信息,并由最佳估计器进行处理,以确定补偿失真所需的相位校正。为了开发估计器,开发了复杂基带地形反射的统计模型。反过来,这又用于生成条件概率密度,涉及范围多普勒观测值和要估计的参数。这些密度随后用于开发最小方差和最大似然估计量。新的估算器使用以前的技术尚未利用的其他信息,因此可提供增强的性能

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