Simultaneous observations of structure function parameter of refractive indexusing a high-resolution radar and the DataHawk small airborne measurement system
Simultaneous observations of structure function parameter of refractive indexusing a high-resolution radar and the DataHawk small airborne measurement system
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利用高分辨率雷达和DataHawk小型机载测量系统同时观测折射率的结构函数参数
DOI：
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发表时间：
2016
期刊：
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通讯作者：
B. Balsley
中科院分区：
文献类型：
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作者：
D. Scipión;D. Lawrence;M. Milla;R. Woodman;Diego A. Lume;B. Balsley
抽象的。 SOUSY（探测系统）雷达于 2000 年搬迁至秘鲁利马附近的吉卡马卡射电天文台 (JRO)，其中雷达控制器和采集系统采用最先进的部件进行了升级，以充分利用其高分辨率大气探测的潜力。由于其宽带宽 (4MHz)，它能够以高距离分辨率 (37.5m) 表征晴空反向散射。 JRO 于 2014 年 7 月开展了一项活动，旨在使用 DataHawk (DH) 小型无人机系统以高时间分辨率 (8.1Hz) 表征对流层低层，该系统可在对流层低层小至 1m 的尺度上提供原位大气测量，并且可以在 GPS 引导下获得雷达波束内的测量结果。这是一个独特的机会，可以通过两个系统进行一致观测并直接比较它们的现场和遥感参数。由于 SOUSY 仅指向垂直方向，因此只能检索由分辨率体积内折射率变化引起的垂直雷达剖面。由散射引起的湍流变化由折射率 Cn2 的结构函数参数来描述。 DH 的 Cn2 剖面是通过结合沿螺旋轨迹的压力、温度和相对湿度测量值获得的，并以与雷达距离分辨率相同的比例进行积分。在海拔 1200m 至 4200m 的重叠测量范围内，从 DH 和 SUSY 获得的 Cn2 估计值之间观察到了极好的一致性，并且这种对应关系为用于测量 Cn2 的 SUSY 雷达提供了首次精确校准。
Abstract. The SOUSY (SOUnding SYstem) radar was relocated to the Jicamarca Radio Observatory (JRO) near Lima, Peru, in 2000, where the radar controller and acquisition system were upgraded with state-of-the-art parts to take full advantage of its potential for high-resolution atmospheric sounding. Due to its broad bandwidth (4 MHz), it is able to characterize clear-air backscattering with high range resolution (37.5 m). A campaign conducted at JRO in July 2014 aimed to characterize the lower troposphere with a high temporal resolution (8.1 Hz) using the DataHawk (DH) small unmanned aircraft system, which provides in situ atmospheric measurements at scales as small as 1 m in the lower troposphere and can be GPS-guided to obtain measurements within the beam of the radar. This was a unique opportunity to make coincident observations by both systems and to directly compare their in situ and remotely sensed parameters. Because SOUSY only points vertically, it is only possible to retrieve vertical radar profiles caused by changes in the refractive index within the resolution volume. Turbulent variations due to scattering are described by the structure function parameter of refractive index Cn2. Profiles of Cn2 from the DH are obtained by combining pressure, temperature, and relative humidity measurements along the helical trajectory and integrated at the same scale as the radar range resolution. Excellent agreement is observed between the Cn2 estimates obtained from the DH and SOUSY in the overlapping measurement regime from 1200 m up to 4200 m above sea level, and this correspondence provides the first accurate calibration of the SOUSY radar for measuring Cn2.