Ground terahertz radar system for detecting cloud

Abstract

The invention discloses a ground terahertz radar system for detecting a cloud. The system comprises a terahertz transmitting module, a terahertz receiving module, a terahertz transmitting-and-receiving antenna module, a terahertz signal processing module and an upper computer module; the center frequency of a terahertz signal transmitted by the terahertz transmitting module is 220 GHz, the work bandwidth is 5 GHz, the transmitting power is 200 mW, the pulse width is adjustable ranging from 100ns to 3mus and the adjusted step length is 100ns, and the pulse repletion frequency is adjustable ranging from 1KHz to 10KHz and the adjusted step length is 1KHz. Compared with a laser radar and a millimeter wave radar, the ground terahertz radar system for detecting the cloud utilizes a set of parameters applicable to the cloud detection and is capable of penetrating into a thin cloud and an extremely thin cloud to carry out the three-dimensional structure detection for the cloud, and therefore not only a macrostructure such as the cloud thickness, the cloud height, the number of cloud layers, the vertical section variance of the cloud can be obtained, but also a microstructure such as the size, the shape, and the ice water content of a cloud particle can be obtained.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a ground terahertz radar system for measuring clouds. Background technique [0002] Clouds are one of the most important and most difficult meteorological elements to determine in global climate models, and they play an important role in the Earth's energy balance, climate change, and weather evolution. Clouds control the Earth's energy budget by affecting the Sun's short-wave radiation and Earth's long-wave radiation. The distribution characteristics of clouds and the monitoring of their evolution and movement process play a very important role in the study of global climate change and weather forecasting. [0003] At present, the research methods for cloud measurement are mainly microwave radar, including microwave radiometer, airborne sonde, and millimeter-wave cloud measurement radar. Among them, microwave radiometers and airborne sondes can obtain certain cloud information, ...

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Problems solved by technology

However, the laser penetration is weak, and it can only measure the surface of the cloud, and cannot obtain information inside the cloud.

[0006] However, the existing cloud measurement methods still have certain limitations:

[0007] (1) Microwave radar has too strong penetrability to cloud particles with small particle size, and the echo intensity is weak, so it cannot even detect thin and extremely thin clouds;

[0008] (2) Lidar has weak penetration and can only measure the surface of the cloud layer, so it can only provide information on the surface of the cloud layer, and cannot penetrate into the cloud for three-dimensional detection of cloud structure;

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