Echo Power Screening and Digital Land Classification Data-assisted Wind Speed Estimation of Low-altitude Wind-shear
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摘要: 针对非均匀杂波环境下，低空风切变风速估计不准的问题，该文提出一种回波功率筛选与数字地表分类数据(DLCD)辅助的低空风切变风速估计方法。该方法首先利用样本回波功率对训练样本进行初选，然后利用DLCD计算各样本间的相似度，并从功率较大的训练样本中选取样本相似度较高的训练样本估计待测距离单元的杂波协方差矩阵，最后利用广义相邻多波束(GMB)-局域联合处理(JDL)的方法实现低空风切变风速的有效估计。Abstract: In order to solve the problem of inaccurate estimation of low-altitude wind-shear wind speed under non-uniform clutter environment, a kind of low-altitude wind-shear wind speed estimation method based on echo power screening and Digital Land Classification Data (DLCD)-assisted is proposed. The method firstly uses the sample echo power to select initially the training samples, then uses the DLCD to calculate the similarity between the samples, and selects the training samples with higher sample similarity from the higher-powered training samples to estimate the clutter covariance matrix, finally uses the Generalized adjacent Multiple-Beam (GMB)-Joint Domain Localized (JDL) method to achieve wind speed effective estimation of low-altitude wind-shear.
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表 1 雷达与载机仿真参数设置
参数名称 数值 参数名称 数值 飞行高度(m) 600 阵元数 8 载机速度(m/s) 75 采样周期数 32 雷达工作波长(m) 0.05 主瓣方向(°) (60, 0) 脉冲重复周期(ms) 0.143 杂噪比(dB) 40 距离分辨率(m) 150 信噪比(dB) 5 
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表 2 风速估计均方根误差
风速估计方法 均方根误差(m/s) 均匀环境最优STAP 1.8128 均匀环境GMB-JDL 2.0617 非均匀环境最优STAP 12.0579 非均匀环境GMB-JDL 8.6787 非均匀环境样本挑选最优STAP 24.4810 本文所提方法 6.0489
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