Simrad ARGUS FMCW 3G, User Manual

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General information | Argus Radar System Operator Manual
the selected transceiver represent the data on which the equipment operates.
The signal process mainly consists of two steps:
• the Video Signal Processing
• the Automatic Target Tracking.
The results of the signal processing are both visualised on the monitor and sent to the Auto-
matic Target Tracking circuits.
Target and data display
The monitor presentation area is subdivided in a radar video presentation called PPI AREA
and a data table SYSTEM DATA AREA (for more details, refer to Chapter 2). The total area of
the screen is made up of a rectangle of pixels, depending on the size of the display. The video
signal and the graphic symbols (vectors, arcs, special symbols, bearing scale and segments)
are represented within the area of the PPI.
Video signal processing
This section receives the Video Signal from the transceiver and, after conversion into digital
form, processes it by removing:
• Sea Clutter
• Rain Clutter
•
Interference.
The processed signal is sent to:
• the monitor for visualisation
•
the Automatic Target Tracking circuits.
In the Video Signal Processing blocks, the digital signal is processed by means of complex
algorithms in order to recognise the presence of a target and, if the target is present, its shape
and the target coordinates.
The target coordinates and the target shape are sent, in digital form, to the Automatic Track-
ing Section of the equipment.
Failure procedure
This description does not describe failures that can occur during operation. If a failure occurs,
the operator must perform all relevant actions in order to remove the failure itself. When a
failure occurs, the fail condition is pointed out by:
•
the red SYSTEM FAIL LED
• the acoustic alarm
• the Fail System Warning will be displayed in the General Purpose Section.
Watchdog function
Warning:
The equipment’s operational software is monitorised by a hardware watch-
dog with a 3s timeout.
Non recoverable errors due to hardware faults are indicated by FAIL indication on the Control
Panel flashing at approximately 1 Hz.
Any type of failure caused by software or hardware, which stops the system for more than half
a second activates the System Failure relay on the Alpha PCB. This check doesn’t need soft-
ware intervention, but is automatically controlled by the hardware. The Failure relay contact
is normally closed, so the function is active, also when the main line is absent or the power
supply has failed.