三角尺度效应对中频雷达风场探测的影响分析

 采用空分天线测风模式的中频雷达在使用全相关分析算法时,天线阵尺度的变化会带来风速风向的计算偏差,称为三角尺度效应.由于三角尺寸效应的存在,中频雷达天线设计必须考虑天线阵尺度的影响因素.本文主要从两个方面分析天线阵尺度对MF雷达风场探测的影响:(1)天线阵尺度对互相关函数最大值校正误差的影响；(2)天线阵尺度对数据采信率的影响.分析结果表明:为保证较高的数据采信率,天线阵尺度应小于衍射图尺度.而在满足天线阵尺度小于衍射图尺度的范围内,选择较大的天线尺度将有助于提高平均测风精度.最后提出了中频雷达天线阵尺度选择建议.

The Effed of Triangle Size Effect on Wind Velocity Estimation for MF Radar

Triangle Size Effect (TSE) is one of the major sources of wind estimate bias in SA mode for MF radar. So the size of antenna arrays must be considered in the design of MF radar. The effect of TSE on MF radar is analyzed from the following two aspects: (1) How the size of antenna arrays influence the error of cross-correlation function maximum; (2) How the size of antenna arrays influence the acceptance rate. The results show that the size of antenna arrays should be smaller than the patterns size to ensure the high acceptance rate. When the above condition is satisfied, the larger size of antenna arrays, the lower wind estimates bias. Finally, how to choose the appropriate size of antenna arrays is discussed.