Influence of wind and temperature on the height limit of a radio acoustic sounding system
Influence of wind and temperature on the height limit of a radio acoustic sounding system
复制标题
风和温度对无线电声学探测系统高度限制的影响
DOI：
10.1029/rs023i004p00647
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发表时间：
1988
期刊：
影响因子：
1.6
通讯作者：
Y. Masuda
中科院分区：
文献类型：
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作者：
Y. Masuda
研究了大气风廓线和温度廓线对射电声探测系统测温时最大高度的影响。RASS使用雷达接收由入射声脉冲产生的大气折射率周期性扰动产生的回波（RASS回波）后向散射，并通过由RASS回波信号的多普勒频移得出的局部声速测量大气温度。RASS回波有效后向散射的重要条件之一是雷达波束入射垂直于折射率扰动的波面，即声波前。本文给出了在雷达和声天线固定配置下，在变高背景大气风和温度影响下传播声脉冲波前形状变化的情况下，满足上述条件的部分声波前的数值模拟结果。利用可操纵波束的中高层大气雷达，在不同大气条件下，将计算结果与RASS实验结果进行了比较。对有效接收雷达回波高度范围的数值估计与实际雷达观测结果吻合较好。1988年1月在强风条件下测得高度达8.4公里的RASS回波，1986年7月在无风条件下测得高度达22公里的RASS回波。
Influences of the atmospheric wind and temperature profiles upon the maximum height in temperature measurement by using a radio acoustic sounding system (RASS) were studied. The RASS uses radar to receive echoes (RASS echoes) backscattered from periodic perturbations in the atmospheric refractive index produced by an incident acoustic pulse and to measure the atmospheric temperature from the local speed of sound which is derived from the Doppler frequency shift of the RASS echo signal. One of the important conditions for the RASS echo to be efficiently backscattered (for monostatic radar) is that the radar beam is incident normal to the wave surface of the perturbations in the refractive index, i.e., to the acoustic wave front. This paper gives the results from numerical calculations to simulate the portion of the acoustic wave front where the above condition is satisfied, under a fixed configuration of the radar and acoustic antennas, and under changing shapes of the propagating acoustic pulse wave front influenced by height-varying background atmospheric wind and temperature. Comparisons between the calculations and RASS experiments were made by using the middle and upper atmosphere (MU) radar with steerable beam under different atmospheric conditions. The numerical estimations of the height range for effective reception of RASS echo agree quite well with actual RASS observations carried out by using the MU radar. RASS echoes were obtained at altitudes up to 8.4 km under strong wind conditions in January 1988 and up to 22 km under calm wind conditions in July 1986.
佐藤彻：无线电科学。
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