Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ground terahertz radar system for detecting cloud

A terahertz and cloud measurement technology, applied in the field of radar, can solve problems such as weak echo intensity, weak laser penetration, and lidar penetration, so as to improve accuracy, improve quality, and improve system resolution and sensitivity Effect

Active Publication Date: 2015-04-29
CHINA ACADEMY OF SPACE TECHNOLOGY
View PDF4 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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;

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ground terahertz radar system for detecting cloud
  • Ground terahertz radar system for detecting cloud
  • Ground terahertz radar system for detecting cloud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0043] The center frequency of the terahertz signal can be 110GHz, 150GHz, 220GHz, 340GHz, the working bandwidth is 300MHz~5GHz (resolution up to 3cm), the power output is 200mW~100W, and the pulse width is 100ns~3μs (step size is 100ns) , the pulse repetition frequency (PRF) is 1 ~ 10KHz (step size is 1KHz).

[0044] The parameters of the terahertz radar system need to be specifically analyzed and screened according to the characteristics of the cloud.

[0045] (1) Determine the center frequency

[0046] Different detection frequency bands have different sensitivities to meteorological targets. At the above-mentioned atmospheric windows of 110GHz, 150GHz, 220GHz and 340GHz, the attenuation is relatively small, and the one-way attenuation per kilometer is about 5-6dB, and as the altitude increases, the moisture content in the atmosphere decreases rapidly...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/95
CPCG01S13/951Y02A90/10
Inventor 王世涛胡伟东刘帅边明明麻丽香孙玉成王磊
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products