DOC 6501_Release V
ATS-6501 Users Guide
14
Select the proper datum (WGS84 (default) or NAD83) using the datum command.
ATS-6501>datum wgs84
[OK] 2013-08-05T15:28:14Z
To verify these use the settings gps command to check the current settings.
ATS-6501>settings gps
[antenna_delay] 2.650000000000000e-07
[antenna_voltage] 1.200000000000000e+01
[datum] wgs84
[mask_angle] 1.000000000000000e+01
[positioning]
[auto_hours] 1.200000000000000e+01
[manual_position]
[altitude] 1.963545000000000e+02
[latitude] 3.992275796000000e+01
[longitude] -7.758566956000000e+01
[mode] auto
[tracking_timeout] 1800
[OK] 2013-08-05T15:27:19Z
If these settings are correct type save to save the current user default configuration on the system
to ensure the system uses the positioning mode and period after a reboot or power cycle.
Note: If the unit is rebooted, power cycled, or the application is restarted with the positioning
mode set to auto, the system will go through the process of determining its antenna position based
on the position period (auto_hours). Once that period expires the system will again set itself
fixed and use the new determined solution as the fixed position. It will do this each time this
occurs. The [ptd] or UTC offset value reported by the system will be noisier during the auto
position period and will become significantly quieter when the antenna position is fixed.
In addition to automatically determining its antenna location, the ATS-6501 generates a RINEX
(Receiver INdependent EXchange) format observation file (not presently provided on the
SAASM Version). This file format is a standard used by the GPS community and provides all the
necessary GPS measurements for determining the antenna location. The file can be retrieved
from the system by using ftp (login: ftp, password: ftp) to log in and retrieve the file. The file
will be in the “rinex” subdirectory and will have a “.[yy]o” extension where [yy] represents the
last two digits of the current year. Many online processing centers are available (e.g.,
http://www.ngs.noaa.gov/OPUS, http://sopac.ucsd.edu/cgi-bin/SCOUT.cgi) and will process the
observation file free of charge. Doing this improves the position estimate of the antenna and is
recommended for precise time recovery. After this is complete it is possible to set the position
mode to manual using the coordinates provided by these services.
Note: The receiver has a countdown timer to show the amount of time left (position_period)
while in the auto positioning mode. Once this timer counts to zero the RINEX file will be
generated, the receivers position (status gps:position:fixed) will be true and the [time_remaining]
field will no longer be present in the status message.
ATS-6501>status gps:auto_positioning
[time_remaining] 10 hours, 51 minutes
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