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Acutime 2000 Synchronization Kit User Guide A-29
A Trimble Standard Interface Protocol
0x32 Command Packet 32
Accurate Initial Position (Latitude, Longitude,
Altitude) Command
This packet is identical in content to packet 2B. This packet provides
the GPS receiver with an initial position in latitude, longitude, and
altitude coordinates. However, the GPS receiver assumes the position
provided in this packet to be accurate. This packet is used for satellite
acquisition aiding in systems where another source of position is
available and in time transfer (one-satellite mode) applications. For
acquisition aiding, the position provided by the user to the GPS
receiver in this packet should be accurate to a few kilometers. For
high-accuracy time transfer, position should be accurate to a few
meters. TRAIM flags come on if this position is not accurate enough.
Inputting accurate position sets the self-survey completion state to
100%. The uploaded position is not stored in EEPROM unless it is
stored with command packet 8E-26. The input position is reported by
packet 8F-AC.
0x34 Command Packet 34
Satellite Number For One-Satellite Mode Command
This packet allows the user to control the choice of the satellite to be
used for the 1D Timing mode. This packet contains one byte. If the
byte value is 0, the GPS receiver automatically chooses the usable
satellite with the highest elevation above the horizon. This automatic
selection of the highest satellite is the default action, and the GPS
receiver does this unless it receives this packet. If the byte value is
from 1 to 32, the packet specifies the PRN number of the satellite to
be used. A subsequent value of 0 will return the receiver to automatic
1-SV mode.