S
YSTEM
P
ARAMETERIZATION AND
O
PERATION
System 6844(RC) - V03.00
61 / 157
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
5.3.1 Satellite Values (GPS only)
This display function indicates the number of satellites that theoretically lie in the visibility
range of the antenna (V - visible); the actual number of received satellites (T - tracked); the
satellites that are being received (PRN - satellite no.) and a relative measurement of recep-
tion performance.
This information is particularly helpful during installation and analysis of synchronisation
problems (see
Chapter 9 System Indicators / Fault Analysis / Troubleshooting
If the System is set for 3D synchronization it is necessary for a minimum of four satellites to
be in the visibility range of the antenna (tracked) in order to synchronize the GPS System
6844(RC) with UTC and to calculate the position. Under optimum conditions approx. 9-14
satellites are in the visibility range of the antenna, of which 12 can be received in parallel.
In the Position-fix mode at least one satellite is required for synchronization (however the
position is not calculated in this case).
Selection frame:
S H O W S A T E L L I T E S
Y / N
If values are available in the System then the display frame may appear as follows (exam-
ple):
Display frame 1:
V 2 0 : 0 9 5 1 3 : 0 9 0
1 0 0 7 : 0 7 7 2 5 : 0 7 5
Display frame 2:
T 1 0 : 0 6 8 0 3 : 0 6 3
0 7 1 7 : 0 5 1 :
10 satellites are theoretically within visibility range, of which satellite 20 is captured by the
GPS receiver with a relative signal/noise ratio of 95 and satellite 7 with a relative signal/noise
ratio of 77, etc.
A maximum of eight satellites can be shown on the display. This takes place on two frames
which are shown alternately
every three seconds
.
The
Y
key can also be used to manually switch between these two
frames.
V (visible)
The number of satellites which are visible at this location with a theoretically optimum anten-
na position appears under
V
(visible). During the first reception process or after a lengthy
voltage failure the value
00
appears under
V
.
Visible Value
0-14
is the number of satellites that can theoretically be picked up under opti-
mum reception conditions, as calculated by the GPS receiver.
In addition, Visible Value
15-19
can represent an error message from the GPS receiver, if
required. The error message output changes every second between
"V = 0"
and
"V = error
message"
.
If there are no figures under
V
there is a fault on the GPS receiver.