Simrad ARGUS FMCW 3G, Руководство пользователя

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Radar presentation and video processing | Argus Radar Operator Manual
adjustment should be performed about 10 minutes after the radar has been switched on and
once the magnetron has warmed up properly.
To better tune the radar manually, the operator should set the range to 24 NM and set the
gain in order to show the threshold of noise. This is the best condition to tune the radar: with
high enough level of gain and long pulse transmitting. In this condition, adjust the tuning
control to obtain the maximum signal strength. The manual tuning is possible with medium
pulse too, but better to not perform it with short pulse.
Video processing section
In this section of the system data area monitor, the set of video processing is visualised (“Sys-
tem data area sections” on page 23). The following picture shows details about the possible
controls.
1 2 3 4 5 6
Video processing section - Detail
1.
Gain
2.
Anti Rain
3.
Interference Rejection
4.
Scan to Scan Correlation
5.
Sea State
6.
Video Preset
Placing the Trackball pointer on each of the video processing progress bars, the Help line
changes accordingly and the cursor changes to a thin double horizontal arrow.
Gain
The gain progress bar shows the gain level adjusted by the operator, by means of the SKs
used, placing the trackball cursor inside it; its function is to control the strength of the target
returns. The gain adjustment is performed placing the cursor over the gain progress bar and
looking at the Help line, which will change.
By default, at the start-up of the system, the gain assumes the standard value of 80% (normal-
ly the progress bars don’t show the percentage) in order to receive the optimum noise level.
The gain adjustment is a very important operation. The gain control adjusts the sensitivity of
the radar receiver. The proper setting is such that the background noise is just visible on the
screen. Setting up for too little gain, weak echoes may be missed. On the other hand, with an
excessive gain yields too much background noise; targets may be missed because of the poor
contrast between desired echoes and the background noise on the display.
Warning:
The gain control shall not be used to clean the picture from sea clutter noise.
The use of the gain control to clean the picture could compromise the proper working of
the radar tracking facilities.
As the sea control affects the gain, it will be necessary to manually re-adjust it, if the gain set-
ting is changed manually.