Poststatistic steering wind estimation in the troposphere and lower stratosphere
Poststatistic steering wind estimation in the troposphere and lower stratosphere
复制标题
对流层和平流层低层的统计后转向风估计
DOI：
10.1029/93rs00279
复制
发表时间：
1993
期刊：
影响因子：
1.6
通讯作者：
S. Kato
中科院分区：
文献类型：
--
作者：
R. Palmer;M. Larsen;E. L. Sheppard;S. Fukao;M. Yamamoto;T. Tsuda;S. Kato
应用统计后转向（PSS）技术估计风矢量。由于空间分离接收机可用于合成任意方向的雷达波束，因此可以将多普勒波束摆动（DBS）技术与PSS结合使用，以获得风矢量的估计。利用日本中高层大气（MU）雷达获得的数据，在对流层和平流层下层以甚高频波长实施该技术。为了准确估计波束指向，计算了合成的双向天线方向图。同时，探讨了方向灵敏度对该技术的影响。MU雷达的工作模式在典型DBS模式和用于PSS技术的空间干涉（SI）模式之间交替进行。将PSS方法获得的风矢量结果与DBS方法的结果进行了比较，后者被认为是大气风的准确表示。该研究表明，坡向敏感性导致使用PSS低估水平风。利用DBS实验得到的面向灵敏度函数进行校正，校正后的PSS速度与DBS速度比较好。使用垂直指向光束的垂直速度估计显示具有重力波特性，这完全是由于水平风的污染。
Poststatistic steering (PSS) techniques are applied for estimating the wind vector. Since spatially separated receivers can be used to synthesize a radar beam in an arbitrary direction, Doppler beam swinging (DBS) techniques can be used in conjunction with PSS to obtain estimates of the wind vector. Data obtained with the middle and upper atmosphere (MU) radar in Japan are used to implement the technique in the troposphere and lower stratosphere at a VHF wavelength. To obtain an accurate estimate of the beam-pointing direction, the synthesized two-way antenna pattern is calculated. Also, the effects of aspect sensitivity on this technique are explored. The mode of operation of the MU radar was alternated between a typical DBS mode and a spatial interferometric (SI) mode, which was used for the PSS technique. Results from the PSS method of obtaining the wind vector are compared to the DBS results, which are assumed to be an accurate representation of the atmospheric wind. This study suggests that aspect sensitivity causes an underestimate of the horizontal wind using PSS. Corrections were made using the aspect sensitivity functions obtained from the DBS experiment and the corrected PSS velocities compare well with the DBS velocities. The vertical velocity estimate using a vertically pointing beam is shown to possess a gravity wave characteristic which is due solely to contamination from the horizontal wind.