Trimble GPS Overview
Brady Johnson
October 8, 2010
Trimble NetRS Interface
• Materials Needed
– Computer
– Cat-5 Ethernet cable (located with each receiver, in the Pelican case)
• Note: While it might not be absolutely necessary, connection via Ethernet cable has
worked better when the connected computer has a static IP address set. If you experience problems connecting, try setting a static IP and disabling any wireless communications
• Plug Ethernet cable from power connection on receiver to computer (Figure 1)
Figure 1. Connection panel for Trimble receiver. Connection
can be made through Ethernet cable (preferred) or serial cable.
• Open an Internet browser and navigate to http://192.168.1.10
– If the Trimble home screen does not open, close the browser, wait a minute, and
repeat the previous step
– When connected, the home screen (Figure 2) will provide the receiver details
∗ The serial number on the home screen should match the receiver. The default
system name for all receivers is the serial number.
• The left hand menu provides details about the receiver configuration and allows the
user to view real-time satellite information when connected to an antenna.
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Figure 2. Screen shot of the Trimble home screen displaying
receiver details
– Click ‘Satellites’ to display the current configuration of satellites and to view the
satellites that are currently sending information to the antenna
∗ Reviewing this information during field setup is important to ensuring your
location has a clear sky view
· Note: 8-10 Satellites seems to be common for relatively open spaces
– Click ‘Data Logging’ to view your current recording session
∗ Powering up the receiver will usually start the last logging program loaded
to the receiver but clicking through this at setup will ensure the correct
configuration file is running and data files are being saved
∗ The ‘Session Name’ shows the current test (configuration file) that is running.
∗ Click the test name to view the specifics
· Current default is set for longer deployments with continuous collection
of satellite information but data files saved at 10 min intervals. Minimal
pre-processing options are applied at the receiver but can be applied using
Trimble Business Center processing software.
· If you wish to make changes to this file, make sure to save the new file
using a different name so others configuration files are not overwritten
– Under ‘Data Logging’ on the left hand menu, click ‘Data Files’ to view the receiver
memory.
∗ Folders are created for each month with a sub folder for each day. Click
through to the current day and time to ensure your data are being recorded
and files are being created.
∗ An example file path is shown in figure 3. Default file names include the
receiver name (RS4921172725), date (20101006; October 06, 2010) and time
(13:50 UTC).
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Figure 3. Screen shot of the Trimble home screen displaying
receiver details. Files can be saved directly from this screen.
∗ Data can also be downloaded directly from the ‘Logged Date Files’ screen. If
you don’t have many files to download, the easiest way to get the files is to
right-click the file name and save the file to your computer.
· For larger sets of data, FTP can be used to automate the downloading
process
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Creating files to upload to OPUS
Overview
Introduction text from: http://www.ngs.noaa.gov/OPUS/about.html
This Online Positioning User Service (OPUS) provides you with simplified access to highaccuracy National Spatial Reference System (NSRS) coordinates: all you need is a clear view
of the sky and a survey-grade Global Positioning System (GPS) receiver.
OPUS processes your GPS data files with the same models and tools which help manage the
Nation’s Continuously Operating Reference Station (CORS) network, resulting in coordinates which are both highly accurate and highly consistent with other users. Your computed
NSRS position is sent privately via email, and, if you choose, can also be shared publicly via
the NGS database.
• Materials Needed
– Computer
– Trimble Data files (filename.T00)
– RINEX conversion Software
∗ http://www.trimble.com/trimblerinex_ts.asp
– Dat2Rin software (including rinmerge.exe)
∗ http://www.trimble.com/support_trl.asp?Nav=Collection-3621
• Note: There are surely other ways around this process of converting raw files to RINEX
files to piece together 10 min data to longer sets to upload to OPUS. If you find (or
know of) a routine less laborious please pass it on. That being said, the following
routine works and allows the user to join (or segment) periods of time that can be
beneficial to processing using OPUS or Trimble Business Center (TBC)
Convert to RINEX
• Open Convert to to RINEX Program
– Under ’File’, select ‘Open’. Select all files from the station.
– The files will be scanned and you will be able to view data associated with each
file
∗ The file name can be changed by clicking to the right of the ‘RINEX file name
w/o extension’ field. A shorter (or more descriptive name) can be helpful in
merging the files as that process is DOS based.
∗ Under ‘File’, select ‘Convert Files’
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– The files are now in RINEX form and could be uploaded to OPUS if they were of
appropriate length.
∗ OPUS uses two processors for computing absolute position
· Rapid Static requires single data files between 15 mins and 2 hours
· Static requires data greater than 2 hours
Merging Data files
• Place rinmerge.exe in the folder(s) containing your raw data files
• Open a DOS prompt and navigate to your RINEX files (We’ll be using the .10o files)
– To combine 3 files into one file (mergedfile.10o) type the following command
(spacing is important)
∗ rinmerge filename1.10o+filename2.10o+filename3.10o mergedfile.10o
– Warnings may appear in the DOS window pertaining to Unexpected Leap Seconds or unrecognized records in headers but should be followed by a ‘File merge
successful’ output.
∗ Tip: The program has a tendency to crash when combining numerous files
(7+). With 10 minute data files, I typically merge the files into hourly files,
then combine hourly files into a daily file for upload to the Static OPUS
processor.
– The new file (with your given filename) should be in your folder and ready for
upload to OPUS
Upload to OPUS
• Navigate to http://www.ngs.noaa.gov/OPUS/index.jsp (figure 4)
– The ‘View’ and ‘About’ tabs have a wealth of knowledge and links about how
OPUS works and links to other sources of information about processing and creating files for upload
– Enter the email address you want your solution sent
∗ Note: OPUS doesn’t recognize my @u.boisestate.edu account. Maybe an
isolated incident (maybe not) but just use another email if you get an ‘unrecognized email’ error
– Upload your merged .10o file
∗ You can upload multiple .10o files through a single .zip (must be .zip). Doing
this will not join .10o files. Each one will be processed separately and you
will receive individual reports for each file in the .zip
– Select the TRM41249.00 Trimble Zephyr Geodetic with GP. This will include the
offsets listed on the antenna in elevation calculations
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Figure 4. Upload screen for OPUS
– Add the antenna height based on the measurement you made in the field. The
antenna height is the distance between your measuring point and the base of the
antenna (or top of the tripod mount)
– Select a processor to use based on the length of your record and an email will be
sent within a few minutes
∗ The options button allows you to select specific CORS to use (default option
will pick the nearest operating stations) along with some specific projection
objects. Most useful of the options is the ability to receive an .xml file of
the results. TBC allows for the direct upload of .xml files which can serve as
checks (or absolute positions) for baseline calculations.
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