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Noise Characteristics of High‐Rate Multi‐GNSS for Subdaily Crustal Deformation Monitoring
Author(s) -
Geng Jianghui,
Pan Yuanxin,
Li Xiaotao,
Guo Jiang,
Liu Jingnan,
Chen Xianchun,
Zhang Yong
Publication year - 2018
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2018jb015527
Subject(s) - global positioning system , gnss applications , geodesy , geosynchronous orbit , remote sensing , satellite , glonass , geology , computer science , aerospace engineering , telecommunications , engineering
High‐rate GPS (Global Positioning System) has the potential to record crustal motions on a wide subdaily timescale from seconds to hours but usually fails to capture subtle deformations which are often overwhelmed by the centimeter noise of epoch‐wise GPS displacements. We hence investigated high‐rate multi‐GNSS (Global Navigation Satellite System) by processing 1 Hz GPS/GLONASS/BeiDou data at 15 static stations over 24 days and also those from the 8 August 2017 Jiuzhaigou M w 6.5 earthquake. In contrast to high‐rate GPS, its further integration with GLONASS/BeiDou reduces near uniformly the power spectral densities (PSDs) of 1 Hz displacement noise by 4–6 dB over the periods from a few seconds to half of a day, and orbital repeat time (ORT) filtering on all GNSS further again leads to a 2 more decibel decline of the PSDs over the periods of a few tens of seconds to minutes. BeiDou ORT filtering, however, takes effect mainly on the periods of over 2,000 s due to the high altitudes of Inclined Geosynchronous Satellite Orbiters/Geosynchronous Earth Orbiters. Multi‐GNSS integration is on average as effective as GPS ORT filtering in reducing PSDs for the periods of a few tens of seconds to minutes while desirably can further decrease the PSDs on almost all other periods by 3–4 dB thanks to the enhanced satellite geometry. We conclude that the introduction of more GNSS into high‐rate solutions and its augmentation by ORT filtering benefit the discrimination of slight deformations over a broad subdaily frequency band.