تهیه نقشه بارش با استفاده از سیگنالهای تلفن همراه
Measuring rainfall using cell phone links: calibration and validation using a high-resolution X-band radar Introduction
Rainfall is usually measured with rain gauges or weather radars. The estimation of rainfall using microwave links from commercial cellular telephone networks is a new source of information. Those networks cover large parts of the land surface of the earth and have a high density, especially in urban areas. The data produced by the microwave links in such networks is essentially a by-product of the communication between mobile telephones. The electromagnetic signals transmitted from one mobile telecommunication antenna to another are attenuated by rainfall. By measuring the received power at one end of a microwave link as a function of time, the path-integrated attenuation due to rainfall can be calculated. It has already been shown that from this attenuation average rainfall intensities can be derived over the length of a link (typically 0.1 - 10 km). Therefore, microwave links are potentially promising for measuring rainfall with a high temporal resolution (15 min).