Research On The Measurement Of TDOA And FDOA Based On Constellation Satellite System

With the rapid development of world space technology,the development of Satellite technology is increasingly speedily.In particular,the constellation network satellite system is an inevitable trend in the space satellite field.This article is Focusing on the accuracy of the satellite positioning technology,which is based on the constellation satellite system,and It is the research subject of the high accuracy measurement technique for TDOA&FDOA.Then have a deep research in the method and its adaptability basing on two-way-time-transfer(TWTT).On the basis of this,paying more attention on the research of theoretical algorithm、analyzing the error factor of measuring accuracy and constructing the error model.With the application method of software simulation and hardware testing,in order to reduce the error and obtain Methods & measures of higher precision measuring.The main contents are as follows:1)This paper introduces the principle of two-way in the measurement of TDOA&FDOA and the measurement of Carrier phase,then it lays the theoretical foundation for the research of time&frequency difference measurement.2)Complete measuring system design based on measurement theory,and implement system modeling and implementation using relevant simulation software.3)The measuring precision factor and error factor analysis are completed,and the comprehensive detailed factor model is constructed,there are two types of The related factors: one influence factor from theoretical,the other from systematic engineering.4)Design model Interface based on the algorithm and the factor model,implementation model into the simulation platform,by which giving simulation measurement results and the impact analysis,And some factors are verified by real system.5)In the light of the previous study,the paper summarizes the method of improving the frequency difference measurement and the reasonable suggestion to reduce the error.This article fully completes the high precision measurement of time and frequency difference by applying the method of two-way,designs measurement system model,combined with Matlab 、 System View and STK software simulation platform,it establishes the measurement and error factor model into the simulation,and summaries of high precision time and frequency difference measurement method effectively.