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Table 6.34: MCA Structure (continued)
Field
Bytes
1
1
1
1
1
1
1
1
1
Satellite PRN number (1-56). The broadcast ephemeris from a
GLONASS satellite does not contain the satellite slot number.
This information is derived from the almanac. When the GG
Surveyor has ephemeris data for a satellite but no almanac data
(after memory reset with the INI command) the satellite number
is set to zero. Once the almanac has been received, the satellite
number is updated.
Satellite elevation angle (degrees)
Satellite azimuth (units of 2 degrees)
Channel ID (1-24)
Warning flag
Bit 1 Bit 2
0
0
Code and/or carrier phase measured
0
1
Code and/or carrier phase measured, navigation
message obtained, measurement not used to
compute position
1
0
Code and/or carrier phase measured ,navigation
message obtained, measurement used to
compute position
3
Carrier phase questionable
4
Code phase questionable
5
Code phase integration not stable
6
Not used
7
Possible loss of lock
8
Loss-of-lock counter reset
NOTE: More than one bit can be set at the same time.
Goodbad flag indicates quality of position measurement:
0 = measurement not available and no additional data will be sent
22 = code and/or carrier phase measured
23 = code and/or carrier phase measured and navigation
measurement obtained, but measurement not used to compute
position
24 = code and/or carrier phase measured and navigation
measurement obtained, measurement used to compute position
Polarity_know. This number is either 0 or 5
0 means the satellite is just locked
5 means the preamble was found and the polarity of phase
tracking is known and taken into account (i.e., phase
measurements can be used for ambiguity fixing).
Signal-to-noise ratio of satellite observation
Always 0 (not used)
GG Surveyor GPS+GLONASS Reference Manual
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