Satellites – Tracking (Table)

This table shows information about the satellites that are currently being tracked. To sort the table based on column values, click the header at the top of the column.

Select Satellites / Tracking (Table).

 

The table is organized into tabs for each constellation for ease of viewing or can be viewed together using the ALL tab.

If the background color of a given satellite is red, the satellite is unhealthy. Data from unhealthy satellites is logged but is not used in the position solution.

If the background color of a given satellite on the table is orange, the receiver's RAIM (Receiver Autonomous Integrity Monitoring) algorithm has either detected a problem with the satellite or, if you are tracking SBAS, the corrections indicate there is an integrity problem with the satellite. In either case, the satellite is not used in the position solution.

If the background color of a given satellite on the table is blue, the satellite is tracked, but not yet fully phase locked, so it is not yet available for use in RTK. This typically occurs very briefly when a satellite is first acquired or when the environment is hostile to GNSS.

SV – The numeric identifier of the satellite tracked on the channel.

Type – Indicates if the satellite is GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC, SBAS (WAAS, EGNOS, MSAS), or MSS.

Elev [Deg] – The elevation of the satellite, in degrees above the horizon.

Azim [Deg] – The azimuth (direction) of the satellite, in degrees clockwise from True North.

L1-C/No [dB-Hz] / L2-C/No [dB-Hz] / L5-C/No [dB-Hz] – The signal-to-noise ratio of the satellite on either the L1, L2, or L5 frequency. Scaled to a 1 Hertz bandwidth.

L1 – The signal being tracked in the L1 frequency band (1525 to 1614 MHz for each satellite.

L2 – The signal being tracked in the L2 frequency band (1217 to 1257 MHz) for each satellite.

NMA – Navigation Message Authentication. NMA checks that the location and time data it receives from satellite signals are real and haven't been tampered with. This makes the system more secure against spoofing threats, where GNSS spoofers tries to trick your receiver with fake signals. There are two types of message authentication used:

  • Trimble ProPoint® RTX-NMA – It provides broadcast ephemeris authentication via the Trimble RTX correction stream in real-time with initial support for GPS and BeiDou-3 satellites. A Trimble RTX® subscription is not required. ProPoint RTX-NMA complements Galileo OSNMA. To enable ProPoint RTX-NMA, select RTX/xFill in the MSS / Configuration page.

  • Galileo OSNMA (Open Service Navigation Message Authentication) – A free and publicly accessible service that verifies the authenticity of Galileo satellite navigation messages.

Hover over the padlock icon in the satellites tracking table to view the status of the data:

  • Authenticated – The data has been successfully verified.

  • Waiting for Authentication – The system is still gathering information to perform the verification. These signals can still be used, but it might take a few minutes after starting your receiver to get a first location. RTX-NMA does not verify older BeiDou-2 signals, so they will always show as Waiting.

  • Authentication failed – The data verification failed, which could mean a GNSS spoofer is sending fake signals or, in bad environments it can mean a missed bit error. In either case, the satellite is not used until the fault clears. This is treated as an RAIM failure.

L5 – The signal being tracked in the L5 frequency band (1164 to 1214 MHz) for each satellite.

Iono – A green, yellow, orange, or red icon indicates the level of ionosphere disturbance that the RTK base station is experiencing on each satellite. The rover receiver shows this same information using the received IonoGuard base messages. All ionospheric data is logged in the standard Trimble T04 raw data files, which can help Trimble Support further diagnose issues. If IonoGuard messages are not being received from the base station, then the circle symbols are replaced by squares, which indicates the rover receiver is in Fallback mode where the rover receiver calculates the ionsophere activity from the base station correction data. Turn the IonoGuard setting on or off on the General page.

IODE (Issue of Data Ephemeris) – The numeric identifier for the latest ephemeris data collected from this satellite.

URA [m] (User Range Accuracy) – The satellite's estimate of the accuracy of its ranging signals, in meters.

Type – Indicates which satellite model or generation is being tracked (if known).