AN ANALYSIS OF THE EFFECT ON THE DATA PROCESSING OF KOREA GPS NETWORK BY THE ABSOLUTE PHASE CENTER VARIATIONS OF GPS ANTENNA

This article presents the results of a test carried out to check the usability of spherical TLS targets as GNSS antenna radomes (herein called TLS radomes). On different days, the survey was conducted using two GNSS antennas, one of them with a TLS radome. Measurements were made using 2 roof pillars on the rooftop as base-rover pillars with little obstruction. The measurements were carried out for approximately 1 hour in every scenario. The software used for data processing is MATLAB-based software and the raw data were processed using the double difference (DD) strategy to obtain optimal results. The results of the data processing indicated that the TLS radome has no significant influence on availability and accuracy of estimated position. The signals are slightly attenuated by the radome (1-2 dBHz) and the noise level is slightly increased but both effects are negligible for practical purposes. However, we found that the antenna should be calibrated with the TLS radome to clarify apparent minor phase center eccentricities (1-2 mm) and to reduce systematic effects with long periods (few minutes) and amplitudes up to about 5 mm which are likely due to phase center variations.

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A New Approach for Field Calibration of Absolute GPS Antenna Phase Center Variations

Navigation ◽

10.1002/j.2161-4296.1997.tb02346.x ◽

1997 ◽

Vol 44 (2) ◽

pp. 247-255 ◽

Cited By ~ 24

Author(s):

GERHARD WÜBBENA ◽

MARTIN SCHMITZ ◽

FALKO MENGE ◽

GÜNTER SEEBER ◽

CHRISTOF VÖLKSEN

Keyword(s):

Phase Center ◽

New Approach ◽

Field Calibration ◽

Antenna Phase ◽

Antenna Phase Center ◽

Phase Center Variations ◽

Gps Antenna

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Accuracy estimation of the absolute phase recovery in interferometric synthesized aperture radars data processing.

Journal of Radio Electronics ◽

10.30898/1684-1719.2021.7.9 ◽

2021 ◽

Author(s):

A.V. Sosnovsky ◽

Keyword(s):

Data Processing ◽

Coordinate System ◽

Least Squares Method ◽

Radar Image ◽

Alos Palsar ◽

Phase Recovery ◽

Accuracy Estimation ◽

Radar Images ◽

Absolute Phase ◽

The Absolute

The problem of accuracy estimation of the absolute phase recovery in interferometric synthesized aperture radars (InSAR) data processing is considered. A method for accuracy estimation based on the calculation of the standard deviation of the reference phases and the absolute phases measured by the interferometric system in the radar image coordinate system "azimuth – slant range" is developed. The method includes converting the coordinates of the reference topographic height marks from the geographical coordinate system to the radar image coordinate system and then calculating of the transformation parameters between the reference heights and the measured absolute phases using the least squares method. The latter allows one to evaluate the performing effectiveness of individual stages of interferometric processing (multilooking, phase noise suppression, phase unwrapping) and experimentally determine the most effective processing algorithms that provide the best accuracy of the phase recovery and their optimal parameters. The method is tested using the ALOS PALSAR radar images obtained under various imaging conditions.

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