Trimble Outdoors 45005-00-ENG Manuel d'utilisateur Page 154

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A-48 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
0x47 Report Packet 47
Signal Levels for all Satellites Report
This packet provides received signal levels for all satellites currently
being tracked or on which tracking is being attempted (that is, above
the elevation mask and healthy according to the almanac). The
receiver sends this packet only in response to packet 27. Table A-37
shows the data format.
Up to 12 satellite number/signal level pairs may be sent, indicated by
the count field. Signal level is normally positive. If it is zero then that
satellite has not yet been acquired. If it is negative then that satellite is
not currently in lock. The absolute value of signal level field is the
last known signal level of that satellite.
The signal level provided in this packet is a linear measure of the
signal strength after correlation or de-spreading.
0x48 Report Packet 48
GPS System Message Report
This packet provides the 22-byte ASCII message carried in the GPS
satellite navigation message. The receiver sends this packet in
response to packet 28 and when this data is received from a satellite.
The message is effectively a bulletin board from the Air Force to GPS
users. The format is free-form ASCII. The message may be blank.
Table A-37 Report Packet 47
Byte Item Type
0 Count BYTE
1 Satellite number 1 BYTE
2-5 Signal level 1 SINGLE
6 Satellite number 2 BYTE
7-10 Signal level 2 SINGLE
(etc.) (etc.) (etc.)
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