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Appendices
36 Test Bed Receiver Subsystem Addendum – Rev 1
UNIMPLEMENTED COMMANDS
Currently, the ability to set satellite health, and the ability to de-weight the range of a satellite in the solution
computations, is not enabled for GLONASS. Because of this, the following commands will not work with the
MiLLennium-GLONASS GPSCard for GLONASS satellites.
• SETHEALTH
• RESETHEALTH
• RESETHEALTHALL
• LOCKOUT
NOTE: The unimplemented commands are disabled for GLONASS satellites only. These commands can still be used
with GPS satellites.
If, by mistake, you issue an unimplemented command to the MiLLennium-GLONASS GPSCard for a GLONASS
satellite, the MiLLennium-GLONASS GPSCard will simply inform you that the PRN is invalid. The MiLLennium-
GLONASS GPSCard is unable to accept a GLONASS PRN as an argument.
For further information on these commands, please consult the MiLLennium Command Descriptions Manual.
GLONASS-SPECIFIC LOGS
GLONASS-specific logs provide data by using information obtained from the GLONASS satellite system. Following are
the descriptions of MiLLennium-GLONASS GPSCard’s CALA/B, GALA/B, GCLA/B and GEPA/B logs. The syntax
and fields are as described below.
CALA/B CALIBRATION INFORMATION
GPS satellites all broadcast on the same frequency but broadcast different codes. GLONASS satellites broadcast on
different frequencies but use the same code. The former technique is known as Code Division Multiple Access (CDMA)
while the latter is known as Frequency Division Multiple Access (FDMA).
Frequency dependent characteristics of the hardware result in small biases in the GLONASS pseudoranges. You can enter
calibration numbers for the various frequencies which will be subtracted from each pseudorange with the CALA/ B input.
The numbers can also be output as a log, CALA/B.
CALA
Structure:
$CALA week
sec reserved reserved
bias 1
std. dev. bias 1
...
bias 32 std. dev. bias 32
[CR][LF] *xx