Elements of the Session Editor

This shows the name of the session you are viewing.

This displays the times for each of the satellites used in the session. The default view shows the time span for all of the satellites, from the first occupation's start time to the end time of the second occupation. When you zoom to specific data, the timeline changes to reflect the new span.

This lists the satellites that contributed data to the session.

• GPS satellite names begin with G.
• GLONASS satellite names begin with R.
• Galileo satellite names begin with E.
• BeiDou satellite names begin with C.
• QZSS satellite names begin with J.
• NavIC satellite names begin with I. (Note that the NavIC constellation is also known as the Indian Regional Navigation Satellite System (IRNSS)).

Note the following:

• If data is coming from a single satellite system, a minimum of four satellites will ensure there is a position, but there there will be no quality measure (no position standard deviation) and the position will be float not fixed. In order to obtain a fixed position (the processor tries to fix ambiguities), six satellites are required for the GLONASS system and five satellites are required for each of the other systems. This is due to the fact that in order to fix ambiguities, the processor requires redundancy (more observations than unknowns). Additionally, for GLONASS, the processor needs to estimate the frequency dependent carrier bias.
• When combining data from several satellite systems, the processor needs to estimate the clock difference between the systems. This means there is an additional unknown per satellite system, resulting in the need for one more observation (one more satellite).
• To obtain a position using two satellite systems (for example GPS and GLONASS), a total of five satellites is required.
• To obtain a position using three satellite systems (for example GPS, GLONASS, and BeiDou), a total of six satellites is required
• To fix ambiguities, add two more satellites if GLONASS is included, or add one more satellite if GLONASS is not included. For example if GPS and GLONASS are used, a total of seven satellites is required. If GPS and BeiDou are used, a total of six satellites is required.
• Currently the baseline processor is not able to use single-frequency data from the NavIC constellation, which is L5 only, when there is multi-frequency data from other constellations.

This shows the name of the satellite.

Satellite - This displays the name of the satellite you are editing.

Start time - Edit the beginning of the cross-out.

End time - Edit the end of the cross-out.

Click the Apply Time Edits button for these changes to take effect. (See Edit Sessions for additional instructions.)

This plots each of the satellites, and the times they were visible in each of the two occupations in the session. Tick marks denote the beginnings of segments within occupations.

When you move the cursor in the view, the timeline displays the exact time represented by the cursor's position.

Gray indicates that a satellite has been disabled so it will not be considered in baseline processing. (See Edit Sessions for additional instructions.)

Cross-outs indicate that a section of the satellite data has been masked so it will not be considered in baseline processing. (See Edit Sessions for additional instructions.)

Enable this to display only the extent of the session (overlap of the occupations).

Color Key

Indicates occupation, generally at the base station.

Indicates occupation, generally at the rover.

Indicates a cycle slip on the carrier.