Research On FY-4 Terahertz Remote Sensing Link Simulation And Key Technology

The launch of FY-4 satellite is great events related to the national economy and the people’s livelihood last year.The satellite can provide services for weather forecast,climate prediction and space environment monitoring.In this paper,the system simulation platform of FY-4 millimeter wave terahertz detector is established by using ADS software.It is used to analyze the influence of antenna deformation on remote sensing images.The specific contents are as follows.Firstly,it introduces the source of the subject and explains the importance of the work.The history and research status of terahertz radiometer at home and abroad are introduced.Based on the main problems of FY-4 millimeter wave terahertz detector,the focus of this paper is put forward.Secondly,the basic theory and key problems of the space-borne terahertz radiometer are discussed.Through the research of the radiation measurement process,it lays the foundation for building the FY-4 simulation platform and studying the key problems.Thirdly,the FY-4 satellite millimeter wave and the terahertz radiometer load are introduced.Through the establishment of the FY-4 millimeter wave terahertz detector system simulation platform,the detection performance of each receiver is obtained and the simulation link is formed.Fourthly,two kinds of deformation of the reflector antenna are simulated,and the influence of the reflection surface deformation on the antenna pattern is obtained.On this basis,the connection between the antenna gain,the beam width,the direction map and the imaging results is established.The influence of the change of the direction map on the imaging effect is clearly defined.Finally,in order to have a deeper understanding of the working process of the radiometer and realize the combination of software and hardware,a W-band radiation measurement system is developed based on the practical engineering application requirements.The hardware level of the system is verified by the testing of each module of the radiometer system.On this basis,the 94 GHz system prototype is integrated.A preliminary experiment has been carried out to accumulate experience for the next step of system integration and system debugging.