Geodetic GPS data collected with antennas connected to rock outcrops as part of AAS 4318

Brief description

Geodetic GPS data collected with antennas connected to rock outcrops as part of AAS 4318. Six new GPS sites were established (sites CAD1, CAD2, CAD3, CAD4, CAD5 and CAD6) and measurements at a previously established site (BHIL) was recommenced. The sites were deployed continuously, although measurements were intermittent based on power restrictions and hardware performance issues.

Approximate site locations are given below in units of decimal degrees (WGS84) as (latitude longitude) pairs:
CAD1 approx coordinates only - Carey Ntk - as no data yet downloaded
CAD2 -68.566510985 86.100627506 Mt Brown, new site established under this project
CAD3 -66.521103808 96.363667501 Gillies Island, new site established under this project
CAD4 -67.419656438 99.143785987 Mt Strathcona, new site established under this project
CAD5 -66.552475869 107.764024273 Snyder Rocks, new site established under this project
CAD6 -66.789282506 120.990964280 Chick Island, new site established under this project
BHIL -66.251024752 100.599006649 Bunger Hills site, originally established by Geoscience Australia

We also analysed the International GNSS Service data from Casey (CAS1) and Davis (DAV1). We provide time series for all sites. We provide raw carrier phase and pseudorange data in RINEX format for sites other than DAV1 and CAS1 as these data are freely available within many public archives.

Site metadata for DAV1 and CAS1 is available at the International GNSS Service (igs.org) in the form of site logs. Site logs for BHIL and CAD1-6 are provided as part of the data archive in International GNSS format.

Antennas for CAD1-6 were connected to bedrock via a POLENET antenna monument drilled and epoxied into bedrock. Existing monuments were used for BHIL, CAS1 and DAV1. Choke ring drainage holes were plugged after deployment of sites.

Site changes
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Instruments were deployed continuously but did not operate continuously due to solar powering of the instruments with a small battery array.

There were no hardware changes at the sites up to the time of writing (Feb 2021). The exception was a receiver swap at site CAD3 on 2019-10-18. The metadata within the RINEX files is correct and reflects any changes.

Data sets:
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1. bedrock coordinate time series
# Data are in TSVIEW format, a simple ascii file format
# TSVIEW is an open Matlab code for visualising and analysing GPS time series but the series can be easily read by other software
# TSVIEW is available at http://www-gpsg.mit.edu/~tah/GGMatlab/
# and described in Herring, T. MATLAB Tools for viewing GPS velocities and time series. GPS Solutions 7, 194–199 (2003). https://doi.org/10.1007/s10291-003-0068-0
#
# For each site, there are three files, ones for each of North, East and Up.
# For example, for site bhil
# mb_bhil_NEh.dat1 is for the North component
# mb_bhil_NEh.dat2 is for the East component
# mb_bhil_NEh.dat3 is for the Up component
#
# each file contains three header lines followed by the data with one row per epoch, such as
# 1995.1020 0.03150 0.00400
# with column 1 in decimal years, column 2 is the estimate (north, east or height) in metres, and column 3 is the uncertainty (1 sigma) of the measurement in metres

Coordinate time series are one file per coordinate component per site.

Coordinates are in IGS14 reference frame and derived using GIPSYv6.3 using JPL repro2 clocks and orbits.

2. raw RINEX v2 data. RINEX format definitions are provided at https://www.igs.org/wg/rinex/

# RINEX files are provided one per day per site, covering 24hr UT.