Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 123, Issue 2, Pages 1987-2002Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2018JB015527
Keywords
high-rate GNSS; multi-GNSS; orbital repeat time filtering; subdaily crustal deformation
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Funding
- National Science Foundation of China [41231174, 41674033]
- State Key Research and Development Programme [2016YFB0501802]
- China Earthquake Instrument Development Project [Y201707]
- IUGG (International Union of Geodesy and Geophysics) GeoRisk Commission
- Joint Working Group 4.4.1 New GNSS Signals for Crustal Motion Studies under IAG (International Association of Geodesy)
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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 1Hz GPS/GLONASS/BeiDou data at 15 static stations over 24days 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 1Hz displacement noise by 4-6dB 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 2,000s 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 3-4dB 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.
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