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Chapter 3 Visual User Interface
Using and Reading the Visual User Interface (the Receiver Status
Screen)
Operating and Programming Guide 3-5
You can now see that the Receiver is tracking several satellites as
shown in Figure 3-2. The process of acquiring and tracking satellites is
described in the following paragraphs.
Figure 3-2. Receiver Status Screen Displaying Initial Satellite
Acquisition
An asterisk (*) next to the PRN of a satellite in the Not Tracking
column indicates the Receiver is attempting to track it. The elevation
(El) and azimuth (Az) angles of the satellite are indicated. Acq . or
Acq .. tell you that the Receiver is attempting to track that satellite.
One dot after the Acq indicator shows that the Receiver is attempting
to acquire its signal, and two dots indicate impending lock. Eventually,
you will see the satellite move to the Tracking column, which shows
the satellite PRN, the elevation angle of the satellite in the sky (90
°
being zenith), the azimuth angle (number of degrees bearing from true
north), and the carrier-to-noise ratio (C/N). A good carrier-to-noise
ratio is a number above 35, which would be efficient for the Receiver to
operate. Numbers below 35, suggest intermittent tracking of the
satellite or no tracking; check your antenna system should this be the
case.
As indicated by the demonstration screen in Figure 3-2, the Receiver is
now surveying for position. It is tracking four satellites which is the
minimum number that must be tracked to determine postion. As you
can see, the Position MODE line indicates survey is 1.2% complete. A
complete survey would take two hours during which four satellites or
more are continuously tracked.
SYNCHRONIZATION
Receiver Status
---------------------------- ----------------------------
[
Outputs Valid/Reduced Accuracy
]
...........................
...............................................
......................................................
ACQUISITION
ELEV MASK
Not Tracking: 4
Locked to GPS: stabilizing frequency
UTC
ANT DLY
MODE
AVG LAT
AVG LON
AVG HGT
HEALTH MONITOR
PRN
Recovery
Holdover
Power-up
SmartClock Mode
Tracking: 5
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK
[ OK ]
Time
GPS 1PPS Synchronized to UTC
Position
Reference Outputs
PRN El Az
2
7
15
19
22
C/N
49
48
38
36
49
El
70
46
33
28
65
9 11 292
16 24 243
10 deg
61
1.000 us
+71 ns relative to GPS
[GPS 1PPS Valid]
17:56:44 31 Jan 1996
0 ns
Survey: 1.2% complete
N
W
37:19:34.746
121:59:50.502
+34.14 m (GPS)
>>
Az
337
188
82
113
91
*26 Acq..
31 -- ---
*attempting to track
TFOM FFOM
HOLD THR
1PPS TI
Predict --
Holdover Uncertainty