THE PERFORMANCE OF BDS RELATIVE POSITIONING USAGE WITH REAL OBSERVATION DATA

Abstract

With the first phase of COMPASS/BeiDou-2 (BDS) completed, the assessment of
positioning performance and the characterization of its system are analyzed and
presented. Pseudo-range and carrier phase measurements modulated on B1 and B2
have been collected in Shanghai, from 00:00 to 24:00 on 28 December, 2012.
Compared with GPS, visibility and measurement quality of BDS’s GEO, IGSO and
MEO satellites are analyzed. DOP during the whole orbital period is also analyzed
the results demonstrate that BDS’s HDOP is better than GPS’s one, but VDOP
opposite. Furthermore, the result of positioning is also presented and analyzed.
Short baselines are estimated by standalone BDS and GPS’s carrier phase
measurement, respectively, using 48 segmentations of observations during a whole
day (24 hours, each segmentation, is about 30 minutes observation). The analysis of
static relative positioning demonstrates that BDS could achieve to millimeter level,
corresponding to GPS. Kinematic result is produced by double differenced carrier
phase observations with the ambiguities fixed under the constraint of precise short
baseline.The result shows that the centimeter accuracy could be achieved. When
comparing the results of kinematic baseline solutions, performance of BDS is worse
than GPS on North and Up components, but oppositely on the component of East in
the kinematic baseline processing.