Analysis of GNSS signal measurement accuracy
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Wireless, photonics and space engineering (MPWPS), MSc
Publicerad
2024
Författare
Rachman Harfian, Alif
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
eceiver-related errors significantly influence the accuracy of GNSS signal measure ments. One of these errors pertains to the antenna phase center correction. Several
antenna calibration techniques, such as robot calibration, can mitigate the impact
of such errors. However, there is a possibility that calibration corrections may not
completely eliminate the errors in the antenna phase center. To address this issue,
calibrated antenna phase center corrections were investigated by measuring GNSS
signal observations at four different stations, each tilted to various angles in specific
directions, involving up to six baseline length formations. This experiment was dis tinct from previous studies, which only involved one baseline length between two
different stations with antennas physically tilted towards each other. Observation
data from the four different stations were retrieved and processed using GipsyX
with the Precise Point Positioning (PPP) method, and Bernese with the single dif ference technique (DGNSS). Additionally, a laser tracker was utilized to measure the
station positions and baseline lengths, providing more precise measurements. The
phase residual error models were derived from L1, L2 and L3 frequency observations.
The error models indicate that all three frequency observations are influenced by er rors corresponding to antenna phase center corrections, with an error of -0.8867 mm
for L1, -1.5728 mm for L2, and -0.3901 mm for L3.
Beskrivning
Ämne/nyckelord
GNSS, GPS, Carrier Phase, Antenna Phase Center, Single Difference, PPP, GipsyX, Bernese