Mitigation of wing flexure induced errors for airborne direction-finding applications
Mitigation of wing flexure induced errors for airborne direction-finding applications
复制标题
机载测向应用中机翼弯曲引起的误差的减轻
DOI：
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复制
发表时间：
1996
影响因子：
5.4
通讯作者：
A. Paulraj
中科院分区：
文献类型：
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作者：
K. Gustafsson;F. McCarthy;A. Paulraj
阵列校准误差是机载平台测向（DF）的主要误差源。这个问题的产生是因为大型侦察机的机翼会出现明显的弯曲，并且在阵列校准和实际飞行过程中它们的实际瞬时位置可能大不相同。因此，来自时变机翼结构对腹部安装天线的散射会导致阵列响应偏离阵列校准，从而产生测向误差。我们提出了一个由于机翼弯曲导致的阵列流形扰动的简单模型，该模型能够捕捉其影响。这个模型是基于物理原理的，并且已经通过在消声室中对一个缩比模型飞机进行的实验得到了验证。我们的模型可用于推导包括加权子空间拟合（WSF）在内的经典测向估计方案的新版本。
Errors in array calibration are the dominant error source for direction finding (DF) in airborne platforms. This problem arises since wings in large surveillance aircraft exhibit significant flexure, and their actual instantaneous positions during array calibration and operational flight is likely to be quite different. Scattering from time-varying wing structures onto the belly mounted antennas therefore causes the array responses to deviate from the array calibration and gives rise to DF errors. We present a simple model for array manifold perturbations due to wing flexure that captures their effect. The model is physically motivated and has been validated using experiments on a scale-model aircraft in an anechoic chamber. Our model can be exploited to derive new versions of the classical DF estimation schemes including weighted subspace fitting (WSF).