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58
ALARMS
System performance can be adversely affected under certain operating conditions. Loss of
differential signal and/or poor satellite geometry can cause the accuracy of the system to fall
below that required for precision guidance. Should conditions exist which cause the accuracy
to lessen, the user is notified with one of three possible alarm conditions; GPS, Accuracy, or
Differential GPS. These alarms; G, A, D, are displayed on the far right side of the DGPS
Status Display Screen (Configuration Mode - GPS). All other screens display these alarm
conditions as yellow LED’s along the far end of both sides of the Smartbar (refer to diagram
items B and F on page 4). Alarms are represented as follows:
Alarm
Description
[G] GPS Alarm
All 3 LED's on each side. Less than 4 satellites or receiver
mode less than D3X.
[A] Accuracy Alarm
Bottom 2 LED's on each side. HDOP greater than 2.0.
[D] Differential Alarm
Bottom LED on each side. Age of Data greater than 120.
No Alarms
No LED's on each side
[GPS]
The system is not operating in three-dimensional Differential GPS mode. At
least four (4) usable satellites, five (5) or more is preferable, must be commun-
icating with the receiver along with a valid correction signal in order to operate
in 3-dimensional DGPS mode.
[Accuracy]
The Horizontal Dilution of Precision (HDOP) is greater than two (2.0). HDOP is
a fancy term for approximating the error in your position solution caused by
poor satellite geometry. Simply stated, it usually means that you do not have
enough satellites in view (should have a minimum of 5) or the antenna’s view of
the sky is partially blocked. You can see the number of staellites being used by
going to the DGPS status screen (Configuration Mode) and pressing the DOWN
button.
[Differential]
The age of satellite differential correction data has exceeded 120 seconds.
Your GPS receiver is not receiving the correction signal. It may be tuned to the
wrong frequency, the service provider may be out of range or unavailable or
there may be some electrical noise interfering with the signal.
The system should not be used when alarms are present. Many times the alarm conditions
are only temporary and will clear up by themselves. Should alarm conditions remain, refer to
the Troubleshooting section in this manual and the User’s Manual supplied with your GPS
receiver.
Summary of Contents for RGL 600
Page 1: ...RGL 600 SMARTBAR SWATH PATH GUIDANCE SYSTEM OPERATION MANUAL ...
Page 2: ...Use with firmware version ____ ...
Page 66: ...61 RGL 600 MAIN UNIT CONNECTOR CABLE OPTIONS ...
Page 68: ...63 CABLE WIRING DIAGRAMS ...
Page 69: ...64 CABLE WIRING DIAGRAMS continued ...