A ground-based terahertz cloud radar system and its detection method

Abstract

The invention discloses a ground-based terahertz cloud detection radar system and a detection method thereof. A linear frequency modulation signal generation module generates linear frequency modulation signals with an adjustable pulse width; a frequency synthesizer module generates transmitting excitation signals and receiving excitation signals; a terahertz transmitting module generates terahertz transmitting signals; a terahertz receiving module converts terahertz echo signals to intermediate frequency signals; an intermediate frequency signal receiving and processing module generates baseband signals; a signal processing module carries out signal processing on the baseband signals; and an upper computer completes cloud observation data inversion processing on a signal processing result of the signal processing module. A linear frequency modulation working system and an adjustable pulse width are adopted, a high distance resolution can be acquired, requirements on the system transmitting power can be reduced, cloud observation from a ground near distance to a far distance can be met, radar reflectivity factor information with high cloud profile resolution can be provided, cloud space-time and cloud weather macro and micro information of an observation area can be acquired further, and the system and the method can also be used for detection of tiny particles such as haze in the environment.

Description

technical field [0001] The invention relates to the technical field of weather radar active remote sensing, in particular to a ground-based terahertz cloud-measuring radar system and a detection method thereof. Background technique [0002] Clouds play a very important role in the earth-atmosphere system. By affecting the short-wave radiation from the sun to the earth and the long-wave radiation from the earth, they affect the radiation balance of the earth-atmosphere system; clouds are the main carrier of cloud formation and rain. controls the water cycle throughout the Earth; clouds are also a major source of uncertainty affecting current climate research and weather forecasts. The main remote sensing methods of clouds are divided into passive remote sensing and active remote sensing. Among them, passive remote sensing can obtain the macroscopic physical characteristics of clouds, with a large coverage area and low vertical and horizontal resolution. The development of act...

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Problems solved by technology

However, so far, there is no patent on a practical ground-based cirrus cloud observation radar that adopts a pulse compression working system and separate transmission and reception methods.

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