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由于多径效应,米波雷达低仰角测高一般通过空间平滑去相干,或者由反射模型建立合成导向矢量,进而采用多信号分类、最大似然等仰角匹配算法来实现。但固定系数反射模型通常只能适用于平坦地形,在起伏地形条件下建立准确的变系数反射模型极困难。文中分析了目标位置变化过程中地面反射系数的变化情况,提出了一种通过检飞数据直接估算合成导向矢量的方法,以提高起伏地形条件下米波雷达低仰角测高算法的稳健性和精度。实验结果表明了所提方法的有效性,特别在目标距离较远时,使用所提方法得到的仰角精度明显优于传统方法。
Due to the multipath effect, the low elevation elevation of the m-wave radar generally adopts spatial smoothing and decorrelation, or the synthetic guidance vector is established by the reflection model, and then the multi-signal classification and the maximum likelihood elevation matching algorithm are used to achieve. However, the fixed-coefficient reflection model can only be applied to flat terrain. It is extremely difficult to establish an accurate variable-coefficient reflection model under fluctuating terrain conditions. In this paper, the change of the ground reflection coefficient during the change of the target position is analyzed. A method of directly estimating the synthetic steering vector by the data of the fly-detection is proposed to improve the robustness and accuracy of the low altitude elevation altimetry algorithm . The experimental results show the effectiveness of the proposed method. Especially when the target distance is far, the elevation accuracy obtained by the proposed method is obviously better than the traditional method.