Barrow GNSS Survey System - Base Station

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Base Station BARO

A geodetic quality GNSS base station is located at the BARC building. The system consists of a Trimble NetR8 GNSS receiver with Zephyr Geodetic 2 antenna and Pacific Crest Vantage Pro RTK radio transmitter. The base receiver and RTK radio are located in the laboratory 125 of the BARC building, and the GNSS and RTK antennas are on a frame attached to the roof of the building. Data is continuously recorded for post processing, and a real-time kinematic (RTK) broadcast allows local real-time surveys and stakeouts.

The base will support RTK surveys in the local area, including the BEO, and post-processed surveys up to ~100 km away. The system is considered to be a permanent base station, and is not intended to be moved or disconnected. To minimize wear on the RTK transmitter, the radio must be turned off when not in use.

• Base Station Inventory
• Trimble NetR8 resource page

Coordinates

• BARO Coordinates, (antenna referecne point): NAD83:
  71° 19' 30.17020" N
  156° 40' 3.63898" W
  11.511m HAE
  Note the NetR8 receiver is programmed to record this NAD83 coordinate into the GPS data files.

  Orthometric height above mean sea level NAVD88 using GEOID12A:

  14.434m

  Coordinates explained

Access to BARO Base Station Data

Users at Barrow can download base station data directly from the NetR8 receiver web interface or by using anonymous FTP:

• Online access to NetR8 base receiver  http://gps1.barc.alaska.edu

This will bring up the receiver's web interface. The receiver is programmed to allow anonymous access for data download, however if prompted, the username and password are:

Username: dgps
Password: gps

The web interface also allows you to see how many satellites the receiver is tracking, what data files are being logged, and other configuration information. However, you can only download data using this user account and cannot change any of these parameters. Configuration changes are done remotely by UNAVCO using a separate account; contact UNAVCO for any changes or requests.

To download data, next click on the Data Logging tab, then Data Files. Click on the Internal directory then navigate to the directory where the desired files are stored. When you locate the file(s) you want, click on the filename to download. Note that you cannot download any files that are currently being written to. The NetR8 is configured to log files in the following locations:

24-hour 15-second datafiles
/Internal/YYYYMM/24hr15sc/BAROYYYYMMDD0000A.T01

60-minute 1-Hz datafiles
/Internal/YYYYMM/DD/1hr1hz/BAROYYYYMMDDHH00B.T01

60-minute 5-Hz datafiles
/Internal/YYYYMM/DD/1hr5hz/BAROYYYYMMDDHH00C.T01

Each of these file types is allocated a certain portion of the NetR8 memory. When this section of memory is full, the oldest files are deleted. The NetR8 stores approximately 800 days of 15-second data, 60 days of 1Hz data, and 16 days of 5Hz data.

The 15 second data are also available from the UNAVCO data archive (site BARO). Upon request, high-rate data files can be downloaded and made available by UNAVCO, however in general this data is recorded on the receiver only and are not archived. Due to the limited storage space for high-rate data on the receiver, request for archiving high-rate data should be made as soon as possible by emailing archive-gpsunavco.org.

Last modified: 2019-12-24  02:12:47  America/Denver