Development Of DPT Signal Source Equipment

Fengyun series meteorological satellites are the main civilian remote sensing satellites in China.With the development of space technology,the ability of the newly developed satellite to transmit remote sensing data has been greatly improved.The existing remote sensing data receiving system in the ground receiving station of meteorological satellite cannot meet the needs of the new mission.Therefore,it is very necessary to develop a new generation of high-speed remote sensing data receiving system for the meteorological satellite ground station.The main research goal of this thesis is to complete the development of DPT signal source equipment according to the development requirements in the equipment procurement project.Here,the DPT signal source is used as an important device in the test subsystem to test the signal tracking and receiving subsystem.In the process of developing DPT signal source equipment,this thesis needs to complete the development of software and hardware of baseband signal generation,Doppler signal simulation and intermediate frequency modulation.The working principle and realization scheme of these three modules are discussed in detail in this thesis.In the process of developing DPT signal source equipment,this thesis needs to focus on two key techniques,namely synchronous working technique of two DAC chips and digital pre-distortion technique of baseband signals.This thesis makes a detailed study of these two key techniques from three aspects: the generation mechanism of the problem,the principle of solving the problem and the implementation plan.Finally,this thesis also summarizes the hardware development of signal source equipment,tests two key techniques with these hardwares,and analyzes the test results in detail.In this thesis,there are two main innovations: one is to propose a new synchronous working technique of two DAC chips;the other is to realize digital pre-distortion of baseband signals by interval equalization algorithm.