毫米波多普勒雷达RHI退速度模糊研究

毫米波测云雷达是探测非降水云和弱降水云的理想工具,但由于其波长较短,最大不模糊速度较小,因此容易产生多次速度模糊现象,纠正速度模糊是充分利用多普勒雷达风场信息的前提。针对毫米波雷达距离高度显示器RHI(Range Height Indicator)的速度模糊现象,提出了两种退模糊方法,即人机交互方法和自动方法,并用实测数据进行了试验。试验结果表明,两种方法都能较好地退除毫米波多普勒雷达速度场中的速度模糊现象。相比较而言,自动方法比人机交互方法处理效率高,若对于比较小的孤立区域,人机交互方法更有优势。

Research on Doppler Velocity Dealiasing with Millimeter Wave Radar RHI Data

Millimeter wave radar is an ideal instrument for detecting the non-precipitation clouds and weak precipitation clouds,but it is likely to cause velocity aliasing due to its short wavelength.Velocity dealiasing is an effective means of detecting wind field information with Doppler radar.Two methods aiming at velocity aliasing with the millimeter wave radar Range Height Indicator are put forward： human-machine interaction method and automatic method,and tests are conducted with the measured data.It is proved that both methods are satisfactory in dealing with velocity aliasing.The comparison of the results also shows that the automatic method is more efficient than the human-machine interaction method,but for the smaller isolated area,the latter has more advantages.