NavCom StarUtil-3000 Rev.A - Manual (Page 104)

StarUtil-3000 User Guide – Rev A
9-102
Description of Data
The data below is displayed for each channel on the GPS, GLONASS, and SBAS windows.
Differences between the constellations are identified.
 PRN: The satellite number assigned to each channel.
 GPS: The valid range is 1-32. (The receiver allocates the range of 1-37, with 33-37
reserved for expansion.)
 GLONASS: The valid range is 1-24.
 SBAS: The valid range is 120-138.
 AZ: Azimuth. The horizontal angle of the satellite relative to the receiver position in
reference to North ranging from 0 (360) to 359 degrees.
 EL: Elevation. The vertical angle of the satellite off the horizon ranging from 0 degrees to a
zenith of 90 degrees.
 CH (Code Type): The channel number of the receiver, within a range of 0 – 53. The code
types tracked by the channel are:
 GPS: L1CA, L1P1, L2, L2C, and L5 based on the [TRACKINGMODE] command settings
 GLONASS: G1C, G2C, G1P, and G2P based on the [TRACKINGMODE] command
settings
 SBAS: L1CA (These code types are displayed but don’t apply: L1P1, L2, L2C, and L5.)

ST: Status. The channel tracking status of each channel. The status code LOCK means the
channel is locked up for measurement type and satellite, measurements are ready.
 C/No: Signal-to-Noise. The signal-to-noise value varies depending on satellite elevation and
any obstructions between the satellites and the receiver. The typical performance range for
C/N0 for all displayed L1/G1 (GPS/GLONASS) channels is 46dB to 52dB, although higher
and lower values can be noted. The C/N0 for C/A and G1 is the same. G2 is similar to P2
C/No (6 [dB-Hz] less than G1). L1P is 3dB lower than CA, and L2 is 6dB lower than CA. A
value > 50 is typical of a satellite with 50º elevation or higher and a clear view of the sky.
 CR: Costas Ratio: the estimate of maximum error in phase measurement. The Costas Ratio
value has a range of 100 to -100.
 AL: Almanac. Y = almanac is available for the position solution. N = no almanac
 TM: The search timeout; i.e., the number of seconds before the search for the satellite is
stopped.