Study On The Processing Methods Of Precise Obit Determination On Low Earth Orbit Satellite

Because of the special characteristics of its orbit,low-earth-orbit(LEO)satellite related fields of scientific research has been widely used in space physics research,such as the Earth's gravitational field,atmospheric detection and environmental monitoring,etc.However,the high-precision LEO satellite location and speed information is the prerequisite for their applications.This article looks at the data processing problems of the LEO satellite precise orbit determination,systematically explores the LEO satellite precise orbit determination of the basic theory and methods,LEO satellite laser ranging data precision processing method and LEO satellite KBR observation data precision processing method,and verifies the correctness and validity of the theory and methods given in the text by the measured data;for the next step,a foundation is laid for using different types of observational data to determine the precise orbit LEO.In addition,it also is helpful for the future China's new generation of low-earth-orbit satellites Post-GRACE data processing.The main content of this paper are s ummarized as follows:1.The current application and development trends of LEO satellite are analyzed and summarized;systematically combing the precise orbit LEO satellite measurement technology currently used;studying the inter-laser ranging data processing method and satellite laser ranging data processing method.The LEO satellite precise orbit determination principles and technical details are more comprehensively studied.2.An optimal GRACE satellite precise orbit determination was given by analysis and research.And based on the program,a week GRACE satellite precise orbit was achieved in the 330-336 Days of 2012.3.Based on a week spaceborne GNSS observation data,GRAC E satellite precise orbit determination was carried out on the basis of the optimal undifferencial reduced dynamic method orbit precise determination strategies.Then GRAC E satellites orbit precision accuracy was analyzed by the methods of the residual analysis,the overlapping arcs comparison,and orbit comparison with the JPL precise orbit.The experimental results showed that: the precise orbit accuracy of GRAC E-A and GRAC E-B satellites was better than 7cm;and the accuracy of GRACE-B satellite precise orbit was slightly better than GRAC E-A satellite precise orbit.4.Based on the GRAC E satellite laser ranging principle,the research on LEO satellite laser ranging data processing theories and methods was launched.According to the method,the GRACE satellites precise orbit was checked.The experimental results showed that: the GRACE-A and GRACE-B satellite RMS of direct verification result were 0.0748 m and 0.0588 m.In addition,the equivalent distances of error correction model in the laser ranging observation data processing were analyzed in detail.The results showed that: the antenna bias correction equivalent distances were between-0.5m and 0.7m;tropospheric delay equivalent distance between 2m and 18m;relativistic effect correction equivalent distance about 2cm;the station coordinate offsets due to the solid tides were several centimeters.5.Based on the GRAC E satellite inter-satellite microwave ranging principle,the research o n LEO inter-satellite ranging data processing theories and methods was launched.According to the method,the GRAC E satellites precise orbit by JPL was checked.The experimental results showed that: the RMS of deviation value between GRACE satellite's JPL post-processing precise orbit were mostly between 5mm;inter-satellite ranging data measured distance with the distance between the two satellites with the JPL precise orbit was no obvious systematic bias;both GRAC E satellites' JPL post-processing precise orbits along the track direction(T)had a higher relative accuracy.