Development of an acoustic transmitter for the high-time resolution measurements of tropospheric temperature structure with the MU radar-RASS

开发用于使用 MU 雷达-RASS 进行对流层温度结构高时间分辨率测量的声学发射机

基本信息

批准号：
06554017
负责人：
TSUDA Toshitaka
金额：
$ 11.58万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

We have been developed a high-power acoustic transmitter system for a RASS (Radio Acoustic Sounding System) which is a remote-sensing technique for obtaining temperature profiles in the troposphere and lower stratosphere with good accuracy and timeheight resolutions.First, we examined a specification of the new acoustic transmitter system of the MU radar required for the observations up to the lower stratosphere, and determined to build up an active phased-array system consisting of 20 electro-dynamic horn speakers surrounding the MU radar.Maximum acoustic output of an electro-dynamic horn speaker reached 140 dB exceeding the required acoustic power. We have also obtained a high acoustic efficiency of 32% by applying a hyperbolic horn. By using the new system, we were successful to observe temperature and wind velocity profiles from 1.5km to 18km altitudes.Further, we steered an acoustic beam formed by a few speakers and analyzed a profile of signal to noise ratios (SNR). The SNR profile indicated that RASS echoes scattered by the acoustic waves from different sources were in-phase and enhanced receiving signal power in a height region expected by the result of ray-tracing of the acoustic waves, which confirmed that the active phased-array system worked correctly.By monitoring detailed structures of meso-and micro-scale phenomena with high time-height resolutions by the RASS developed in this research, we expect to obtain new scientific aspects of mechanisms of the phenomena, and characteristics of various atmospheric waves excited by them.

我们开发了一种用于 RASS（无线电声学探测系统）的高功率声学发射机系统，这是一种遥感技术，用于以良好的精度和时间高度分辨率获取对流层和平流层下层的温度剖面。首先，我们检查了规格MU雷达的新型声学发射机系统需要观测到平流层下部，并决定建立一个由围绕MU的20个电动喇叭扬声器组成的有源相控阵系统雷达。电动喇叭扬声器的最大声输出达到140 dB，超过所需的声功率。我们还通过应用双曲线号角获得了 32% 的高声学效率。通过使用新系统，我们成功地观测了1.5公里至18公里高度的温度和风速剖面。此外，我们引导了几个扬声器形成的声束，并分析了信噪比（SNR）剖面。信噪比曲线表明，不同源声波散射的RASS回波是同相的，并且在声波射线追踪结果预期的高度区域内接收信号功率增强，这证实了有源相控阵系统通过本研究开发的RASS以高时间高度分辨率监测中观和微观尺度现象的详细结构，我们期望获得现象机制的新科学方面，以及由大气波激发的各种大气波的特征。他们。