A method for measuring rainfall intensity based on satellite-ground link attenuation effect

Abstract

The invention discloses a method for measuring rainfall intensity based on the attenuation effect of the satellite-ground link. The attenuation characteristics generated when the satellite communication signal passes through the rainy area are used to measure the average rainfall intensity of the satellite-ground link on the propagation path of the rainy area, including The following steps are as follows: first, build a satellite signal receiving antenna on the ground, determine the frequency and polarization of the satellite signal, and use the satellite receiver to record the signal strength; then separate the rain-induced signal attenuation according to the change of the signal strength in rainy and non-rainy weather ; Finally, the average rainfall intensity on the propagation path is obtained by inversion of the relationship between rain attenuation and rainfall intensity. This method has the advantages of many measurement points, wide coverage, high spatial-temporal resolution, and low installation and maintenance costs. As long as there are satellite antennas erected, it can be used to measure rainfall intensity, which can make up for the low spatial-temporal resolution of meteorological satellites and weather radar. Scanning has disadvantages such as blind spots and sparse rain gauge stations.

Description

technical field [0001] The invention relates to the field of automatic detection of ground meteorological elements, in particular to a method for measuring rainfall intensity based on the attenuation effect of a satellite-ground link. Background technique [0002] Accurate measurement of rainfall intensity and location is of great significance for the study of water cycle and warning of dangerous weather. At present, the commonly used rainfall measurement methods mainly include spaceborne rain radar, ground-based weather radar and rain gauge. Although the space-borne rain radar can monitor global rainfall, it needs to be installed on a low-orbit polar-orbit satellite, so the time resolution is very low and cannot meet the requirements for real-time monitoring of rainfall; the ground-based weather radar can monitor The range is about 30,000km 2 , the time resolution is about a few minutes, and the spatial resolution is about one kilometer. However, because the electromagnet...

AI Technical Summary

Problems solved by technology

Although the space-borne rain radar can monitor global rainfall, it needs to be installed on a low-orbit polar-orbit satellite, so the time resolution is very low and cannot meet the requirements for real-time monitoring of rainfall; the ground-based weather radar can monitor The range is about 30,000km 2 , the time resolution is about a few minutes, and the spatial resolution is about one kilometer. However, since the electromagnetic wave emitted by the radar propagates in a nearly straight line, there is a blind area under high elevation scanning; the rain gauge can monitor the rainfall intensity in real time, but its spatial representation is limited. Deploying rain gauges in areas such as mountains, rainforests, deserts, and wetlands is not only difficult but also difficult to maintain

Images