Preprocessing of the GPS Raw Data for the Precision Orbit Determination by Dgps Technique

Abstract

This article investigates the problem of data preprocessing for the precision orbit determination (POD) of low earth orbit satellite using GPS raw data. Several data preprocessing algorithms have been developed to edit the GPS data automatically such that outlier deletion, cycle slip identification and correction, and time tag error correction. The GPS data are precisely edited for the accuracy of POD. Some methods of data preprocessing are restricted to the rate of the collections of the pseudorange and carrier phase measurements. This study considers the preprocessing efficiency varied with the rate, the quality of receiver and the altitude of the satellite's orbit. We also propose the proper methods in accordance with the rate for single frequency and dual frequency receivers.

Keywords

• preprocessing
• precision orbit determination
• GPS
• cycle slip
• bad point
• DGPS technique