Training materials GNSS Processing How to download reference data

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Training materials – GNSS

Processing

How to download reference

data

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Leica Infinity, How to download reference data 3

Introduction

This is a step-by-step tutorial in which you learn how to download and import static GNSS data from continuously operating reference stations from service providers like IGN, IGS or SmartNet, as well as how to manually add a new reference station.

Multi-constellation (GPS, Glonass, Beidou, Galileo) static raw data has been acquired by the GS14 receiver at 1 Hz sampling rate. In order to process the baseline, we need to download the data from the closest reference station.

The functionality discussed in this guide requires the Basic license option. The data from the following folders will be used in this tutorial:

· Data\static-cs-s2_1683_0816_141627

1. Import rover data

1.1 Start Infinity and create a new project. Choose Home tab in the ribbon bar and select Import.

1.2 In the Import dialog navigate to directory Data, select the file “static-cs-s2” and select Import to import the data using the default settings.

1.3 Switch to the GNSS tab of the data Inspector to view the imported interval.

If the GNSS Intervals view is not available, you can display it by selecting the Viewer button at the top right corner of the Inspector.

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2. Find the closest reference station

2.1 To view a list of the Reference Stations, select Download from the Processing tab.

· The GNSS Manager opens in the Reference Stations tab.

You can also select the rover interval in the GNSS Inspector and select Download Reference Data from the context menu.

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Leica Infinity, How to download reference data 6 2.2 Maximise the GNSS manager to get a

better view of the stations made available by following providers:

· SOPAC · UNAVCO · NGS · RGP

The list and the map are filtered by the radius of the circle.

By default, the circle is located with a radius of 300km around your project data .

You can click on the border of the circle and drag it to shrink or enlarge its radius and find more or fewer stations.

You can click inside the circle and shift it to find stations in another region.

3. Download the data from the selected reference station

3.1 To download data from a reference station, e.g. ZIM2, find and highlight it in the list and select Data Download from the ribbon bar or use the context menu.

You can also type the name of the reference station in the Search box.

You can select multiple reference stations from the list to download data simultaneously.

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Leica Infinity, How to download reference data 7 3.2 Next to the Property Grid a new tab

dedicated to download settings opens. · Start and End Date are

automatically available from the data imported in the project; in this case no changes are needed. · Select to download Precise

Ephemeris as well as the Navigation File.

· Leave the download directory as suggested.

3.3 To initiate the download, select the Start button.

The green Progress Bar informs that data have been downloaded and imported into the project. Availability can comfortably be

checked by clicking the hyperlink on the file name.

comXXXXX.sp3 files contain precise orbits for all satellites and all constellations,

brdmXXXX.16p file contains broadcast ephemeris for all satellites and all constellations.

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Leica Infinity, How to download reference data 8 3.4 To verify that the downloaded

ephemerides have been added to the list, switch to the Precise Ephemeris tab of the GNSS Manager.

3.5 To verify that the data from the reference station ZIM2 have automatically been imported in your project, close the GNSS Manager and switch to the Intervals view of the GNSS Inspector.

· You can now process the baseline ZIM2àCP05.

4. Edit the control coordinates for the downloaded station

4.1 The approximate coordinates of the downloaded station are read from the RINEX file header and the station is assigned the control point role.

To edit the control coordinates, first highlight ZIM2 from the GNSS Intervals view and in the Property Grid WGS84 Position change the output from WGS84 Geodetic to WGS84 Cartesian.

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Leica Infinity, How to download reference data 9 If you cannot visualize the

coordinates in Cartesian format, go to FileàInfo &

SettingsàCoordinates & Units. Make sure that the WGS84 Cartesian option is checked in the Coordinate Display.

4.2 Input the following known coordinates for station ZIM2:

X: 4331300.149 m Y: 567537.075 m Z: 4633133.500 m

4.3 To save the changes, select Apply in the Property Grid.

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5. Connect to the Leica SmartNet Service

5.1 To download data from the SmartNet Reference Stations, connect to the Leica SmartNet Service by selecting

File Services SmartNet.

·

Select a Provider

·

Log in with user name and password

·

Select Connect

The connection check is done and the user is informed about the status.

5.2 When logged in, the SmartNet reference stations are also available in the GNSS Manager Reference Stations tab.

SmartNet reference stations are indicated by a red station icon in the Map view.

The procedure to download data from a SmartNet reference station is the same as for all other stations and has been described in Chapter 3.

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6. Add a user defined reference station

6.1 To add a user defined reference station, select Download from the Processing ribbon bar and then New from the Reference Stations tab of the GNSS Manager, that opens.

6.2 Input the Station info as well as the WGS84 Position. Use the following data as an example:

Id: AMBE

Name: Ambert ENSG Provider: IGN

Sampling Rate: 00:00:30

Receiver Name: ASHTECH PF800 Antenna Name: TPSCR.G3 Satellite System :GPS/GLONASS Latitude: 45 ° 32’ 26’’N

Longitude: 3 ° 45‘ 00’’ E Ellip.Height: 617.0 m

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Leica Infinity, How to download reference data 12 6.4 In the Edit URL flyout, input the ftp

address:

ftp://rgpdata.ensg.ign.fr/pub/data/%yyyy/ %ddd/data_30/amb2%ddd0.%yyd.Z with %yyyy being the placeholder for a 4-digit year, %yy being a placeholder for a 2-digit year and the %ddd being the placeholder for a day of the year.

The URL Preview will always refer to the current day of the year, but it is just for illustration to show that the path and the filename have been entered correctly. 6.5 Confirm the address by selecting OK.

You can additionally enter the user name and the password, if required, but for this reference station that is not required.

6.6 To create the new manually entered reference station, select Create.

The map view in the GNSS Manager jumps to the user entered location and the new station is added to the list of all available reference stations in the Inspector view.

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Leica Infinity, How to download reference data 13 Manually entered reference

stations are indicated by black icon in the map view.

User entered reference stations can be used as all other stations for downloading data, by

following the procedure described in Chapter 3.

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Training materials GNSS Processing How to download reference data