TCG 01 User Manual
9
th
Edition: February 2007
Page 5 of 49
4.1.1 Satellite Tracking Status
Display screens Figure 3: [b], [c] and
[d] all show a three-character status
field at the bottom right-hand side
of the display. This three-character
field provides feedback on the
parameters that affect the operation
of the GPS receiver.
Character
Values
Description
Satellites
in sky
“0”=0
:
“9”=9
“A”=10
“B”=11
“C”=12
Represents the total number of satellites currently present in the
sky according to the GPS almanac. “0” in this position means that
TCG 01 has lost its knowledge of the GPS satellites’ orbit
geometries. This occurs if the unit has been in storage for an
extended period, or if the GPS receiver has been reset. It may
take up to two hours for the TCG 01 to operate normally again.
Satellites
Tracked
“0”=0
:
“9”=9
“A”=10
“B”=11
“C”=12
This digit represents the number of satellites currently being
used to compute the time solution. A “0” value means that no
updated time solution is available, (“out of lock” condition). If
this condition persists for the “Sync Hold” time (See
|
section 8.3.1
on page 18) the clock will indicate the “out of sync” condition
described under section
4.2.1 Warning Status Indications
below.
“A”
TCG 01 in Acquisition mode -- attempting to get satellite fixes
“G”
“Poor satellite geometry”: Satellites are positioned in almost a
straight line so best accuracy cannot be obtained, but the unit
will still sync to UTC.
“2”
A 2D position is in use (no height). This may occur before
Position Hold mode has been reached if only 3 satellites are
tracked. Synchronisation is not compromised.
“3”
A 3D position is in use, which includes height. A site survey
begins next, so this mode is rarely seen.
“S”
Site Survey in progress. TCG-01 is calculating an accurate
position; once complete the mode will change to Position hold.
Receiver
status
“P”
“Position hold”: Position is known accurately, and the GPS is
providing its most accurate time, better than 60ns to UTC.
LST:MON 17 MAR03
076 11:16:53 87A
Satellites in sky
Satellites tracked
Receiver status