Postset beam steering and interferometer applications of VHF radars to study winds, waves, and turbulence in the lower and middle atmosphere
Postset beam steering and interferometer applications of VHF radars to study winds, waves, and turbulence in the lower and middle atmosphere
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VHF 雷达的后置波束控制和干涉仪应用，用于研究低层和中层大气中的风、波浪和湍流
DOI：
10.1029/rs020i006p01461
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发表时间：
1985
期刊：
影响因子：
1.6
通讯作者：
H. M. Ierkic
中科院分区：
文献类型：
--
作者：
J. Röttger;H. M. Ierkic
空间天线甚高频雷达测量用于后置波束控制技术和干涉仪应用，以研究平流层和中间层的风、波和湍流。下面的基本仪器设置和离线分析方法的简要说明，一些结果表明这些方法的一致性和适用性。利用互谱技术分析了重力波引起的垂向速度振荡。结果表明，重力波振荡的相位差，垂直和两个相对的，偏离垂直postset梁之间测量，改变其符号时，梁来回摆动。在观测平均风场时，也发现了同样的速度符号变化特征。用后置波束控制技术得到的平均风场与用天线漂移技术和独立探空风场得到的风场相似。在此基础上，推导了平流层重力波的总波矢和内禀角频率，验证了后置波束控制方法的适用性和可行性。合理的论据进行了讨论，以支持这一建议，这些波产生在平流层下部的风切变区，传播到平流层中部时衰减不大。用干涉仪技术跟踪中间层的湍流斑点。结果表明，这些斑点水平移动以及垂直，不能明确地检测与传统的多普勒方法的功能。
Spaced antenna VHF radar measurements are utilized for the postset beam steering technique and for interferometer applications to study winds, waves, and turbulence in the stratosphere and mesosphere. Following a brief description of the basic instrumental setup and the off-line analysis method, some results are presented which demonstrate the consistency and applicability of these methods. Vertical velocity oscillations due to gravity waves are analyzed by means of the cross-spectrum technique. It is shown that phase differences of gravity wave oscillations, measured between vertical and two opposite, off-vertical postset beams, change their sign when the beam is swung back and forth. The same features of change of velocity sign are noticed when the mean wind is observed. The mean wind deduced with the postset beam steering technique is similar to the wind deduced with the spaced antenna drift technique and the independent radiosonde winds. Taking these results as justification for the applicability and feasibility of the postset beam steering method, the total wave vector and the intrinsic angular frequency of gravity waves in the stratosphere are deduced. Reasonable arguments are discussed to support the suggestion that these waves were generated in lower stratosphere wind shear regions and were attenuated little when propagating up to the middle stratosphere. Turbulence blobs in the mesosphere are tracked with the interferometer technique. It is shown that these blobs moved horizontally as well as vertically, a feature which cannot unequivocally be detected with conventional Doppler methods.