Opportunistic Rainfall Measurements from Dual Channel KU-Band Receiver

F. Mercier-Tigrine, L. Barthès, C. Mallet
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Abstract

We focus in this paper on the use of satellite attenuation in Ku-frequency band for measuring rainfall, using low-cost sensors allowing to measure only the total received power. This implies that the measured powers are not only composed of the satellite signal, but also include a radiometric contribution, which is the atmospheric radiation and the receiving system noise. In case of heavy rainfall, while the satellite signal weakens, the atmospheric radiation becomes more important and neglecting it can lead to a significant underestimation of rainfall. In this paper, we introduce the theoretical framework of these measurements, and derive a simple method for correcting this underestimation, based on the measurements of the received power on two channels (different frequencies and / or polarizations), one with strong satellite signal and the other one with no or weak satellite signal. Then we do a preliminary assessment of this method in Abidjan, Ivory Coast, where such a sensor has been deployed during 9 months close to a rain gauge. These preliminary results show that this method seems to lead to rainfall assessments better than using a single-channel approach, but only after a calibration phase to assess the difference in the gain of the system between the two channels we use.
双通道ku波段接收机的机会性降雨测量
在本文中,我们着重于使用ku频段的卫星衰减来测量降雨,使用低成本的传感器,只允许测量总接收功率。这意味着测量功率不仅由卫星信号组成,还包括辐射贡献,即大气辐射和接收系统噪声。在强降雨的情况下,当卫星信号减弱时,大气辐射变得更加重要,忽略大气辐射会导致对降雨量的严重低估。在本文中,我们介绍了这些测量的理论框架,并推导了一种简单的方法来纠正这种低估,基于两个信道(不同频率和/或极化)的接收功率测量,一个有强卫星信号,另一个没有或弱卫星信号。然后,我们在科特迪瓦的阿比让对这种方法进行了初步评估,在那里,这种传感器已经在靠近雨量计的地方部署了9个月。这些初步结果表明,这种方法似乎比使用单通道方法更好地进行降雨评估,但只有在校准阶段之后才能评估我们使用的两个通道之间系统增益的差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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