8194B, 8195B, 8197B
Spectracom Corporation
GPS Ageless Master Oscillator Instruction Manual
4-12
4.3.10 Display Tracking Histogram
The
Display Histogram
command,
DH
, provides the tracking histogram. The
histogram records the number of satellites tracked each second. At the end of every
hour a log entry is created and the counters start again. In
Read Mode
the command
responds with the last four entries of the histogram and current histogram in process.
While in
Test Mode
, this command responds with the entire histogram log, which
provides tracking data collected over the past six days. The page parameter,
P
, causes
the histogram to display one page at a time. In paged mode the user may quit or
continue the display after each page is displayed. The tracking histogram is useful in
verifying receiver and antenna performance.
Type:
DH <ent>
- OR -
DH P <ent> (paged output)
The tracking histogram is output in the following format:
TIME= HH:MM:SS DATE= YYYY-MM-DD
0= XXXXX 1= XXXXX 2= XXXXX 3= XXXXX 4= XXXXX
5= XXXXX 6= XXXXX 7= XXXXX 8= XXXXX 9= XXXXX
10= XXXXX 11= XXXXX 12= XXXXX Q= QQQQQ
Where:
HH:MM:SS
=
UTC time log was created.
YYYY-MM-DD =
Date log was created.
XXXXX
=
Number of seconds the receiver tracked the
listed
quantity of satellites since the beginning of the hour,
0...3600.
QQQQQ
=
Number of seconds since the beginning of the hour
the GPS signal was qualified, 0…3600.
Example: To view the satellite tracking histogram type the following:
Type
: DH <ent>
Response:
TIME= 12:00:00 DATE= 2004-03-24
0= 00000 1= 00000 2= 00000 3= 00000 4= 00000
5= 00000 6= 00019 7= 01537 8= 02044 9= 00000
10= 00000 11= 00000 12= 00000 Q= 03600
TIME= 13:00:00 DATE= 2004-03-24
0= 00000 1= 00000 2= 00000 3= 00000 4= 00000
5= 00000 6= 00016 7= 01004 8= 02580 9= 00000
10= 00000 11= 00000 12= 00000 Q= 03600
