GNSS/GPS Module Satellite Tracking


The Satellite Tracking screen provides a graphical view of the satellites being tracked. Satellite data is described in the table below.

Field / Section

Description

Satellite Data

 

Channel

Indicates channels currently tracking satellites. Only tracking channels are shown.

SV #

Satellite Vehicle Number - This is the identification number of the satellite being tracked

SNR

Signal to Noise Ratio

Status

Indicates tracking status (see table below)

Health

Indicates the health of the satellite. Contents are H or U

Azimuth

Satellites horizontal position measured in degrees clockwise from the north

Elevation

Vertical position of satellite in degrees from the horizon

PPSSigma

This value is a measurement of the stability of the GPS engine’s 1PPS output versus the SSU’s selected local oscillator

T3Sigma

This is used to determine if the GPS Qualifier alarm should be set or cleared

The Current 1PPS Sigma value is compared to the 3-Sigma threshold

The 3-Sigma threshold is a dynamic value that is updated in real-time

Status indicates the tracking status of the systems signal acquisition on the specified channel. Status messages are listed in the table below.

Status Message

Definition

SRC

Searching

FRQ

Frequency locking

COD

Code locking

MSG

Unit is receiving a summary of visible satellite status

TIM

Setting time

EPH

Setting ephemeris data

OK

Satellite is being used in the timing solution