Rainfall intensity measuring method based on satellite-ground link attenuation effect

Abstract

The invention discloses a rainfall intensity measuring method based on a satellite-ground link attenuation effect. Attenuation characteristics generated when satellite communication signals pass through a rain area are used, and the average rainfall intensity of a satellite-ground link in a propagation path in the rain area is measured; the rainfall intensity measuring method comprises the following steps that firstly, a satellite signal receiving antenna is set up on the ground, the frequency and a polarization method of the satellite signals are determined, and the signal intensity is recorded by a satellite receiver; then rain-caused signal attenuation quantity is extracted according to changes of the signal intensity in rainy weather and non-rainy weather; and finally a relationship between rain-caused attenuation and the rainfall intensity are used for inversion to obtain the average rainfall intensity in the propagation path. The rainfall intensity measuring method based on the satellite-ground link attenuation effect has the characteristics that measuring points are many, the covered range is wide, the temporal-spatial resolution is high, the erection and maintenance costs are low and the like, areas with erected satellite antennae can be used for measuring the rainfall intensity, and the deficiencies that the temporal-spatial resolution of a meteorological satellite islow, scanning of a weather radar has a blind area, rain gauge stations are sparse and the like can be overcome.

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...

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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

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