NavCom SF-3050 Rev.I - Manual (Page 67)

SF-3050 GNSS Product User Guide – Rev I
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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.
 Measurements
The MEAS1B output stream contains raw measureme nt data collected from the receiver’s
tracking channels. Measurements are tracked from both the GPS/SBAS constellation and
the GLONASS Constellation. Raw measurements can be post-processed to achieve
precise point positions.
Figure 54: Measurements Screen
GPS/SBAS Constellation
 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.)

SBAS: The valid range is 120-138.
 CA (m): Coarse / Acquisition code. The number of meters (range measurement) to the
satellite.
 L1-CA (m): The L1 frequency minus the CA measurement.