Green-screen generic radar for big ships
The radar simulates a computer-based radar controlled by the computer mouse (trackball). All functions are implemented by mouse clicks on
corresponding buttons on the display. Current radar modes are designated by indicators located at the top of display, like "EXP" or
"WAKES" or "AIS".
To implement a function requiring specification of a position on PPI, like to acquire a target or specify display offset, use the two steps : (1) move PPI cursor to the required position by dragging cursor with the left mouse button pressed (2) click the corresponding button.
Mouse cursor shapes with two rectangles nearby designate current functionality and show which mouse button click (filled with colour) is available to implement a function.
The BRILLIANCE, GAIN, TUNE and other sliders are used to specify a corresponding value : move mouse cursor over the slider and drag the left mouse button over the slider to change the value.
|Function||How to implement|
|switch on||click [POWER ON/OFF]|
|switch off||click [TRANSMIT/STANDBY] and then [POWER ON/OFF]|
|heading mode||click [HEAD UP] or [NORTH UP]|
|changing range||use [+] and [-] buttons. Current range value is displayed at the upper right corner of the screen|
|range rings||use [RINGS ON/OFF] to hide/show|
|heading line (hide temporarily)||click [HIDE SHM]; the line stays hidden while the button is pressed|
|PPI centre offset||to offset PPI centre, move PPI cursor to a new place and click the left mouse button. Click [OFFSET] to make this point the new PPI centre position. Offset positions can be set within 2/3 of current range radius measured from own ship position|
|set zero centre offset||click [NO OFFSET]|
|target expansion (echo stretch)||is used to enlarge radar echoes from point objects; press [EXPANSION] to turn this function on/off|
|interference rejection||is used to suppress interference from other radars; click [INT REJ] to switch interference rejection on and off|
|wakes (trails)||are afterglows of target echoes; are used to monitor target movements; press [WAKES] to turn this function on and off, use [CLEAR WAKES] to clear the display from wakes|
press VRM/EBL [SHOW/CHANGE] button; an electronic bearing line
and variable range marker appears; a small circle marks a node moveable by the mouse;
drag it with the left mouse button pressed to provide
the marker with a desirable range and bearing; press [ENTER] to complete.
Click [HIDE] to hide the marker
press FLOATING VRM/EBL [SHOW/CHANGE] button; an electronic bearing line
and variable range marker together with two movable nodes marked by small cirles appear; drag them with the
left mouse button pressed to provide
the marker with a desirable range, bearing and offset; do not forget to press [ENTER] to complete.
Click [HIDE] to hide the marker
are sectored zones around the ship used to issue alarms when a
target comes in or out; press GUARD ZONE [SHOW/CHANGE] button; a guard zone appears; drag a small circle
at the upper right corner of the zone with the left mouse button pressed to provide
the zone with a desirable shape; press [ENTER] to complete.
Click [HIDE] to hide the guard zone
|ARPA - Automatic Radar Plotting Aid||
is used to predict positions of targets and estimate risk of
collision by calculating CPA (Closest Point of Approach) -
minimum distance to a target and TCPA (time to this moment) provided
the target and own ship will move with the same constant speeds
and headings. Place PPI cursor over a target and then press ARPA [ACQUIRE TARGET]
to harness a target; the parameters of the acquired target are shown at the right lower
corner of the display;
dangerous targets are marked by blinking triangles and alarm
sounding; press any key to stop the sound.
If a number of targets are acquired, select a target to display its parameters by placing the PPI cursor over the target and clicking [SELECT TARGET] button.
Exclude a target from monitoring by placing the PPI cursor over the target and click [CANCEL TARGET]. Clear all by [CANCEL ALL TARGETS].
|AIS - Automatic Identification System||Ships equipped with AIS transmit information about their MMSI, course, speed, rate of turn, coordinates etc. by radio to other ships hereby providing ready data which is normally calculated by radar processors. Click [AIS] to display/hide this information on the display; AIS data is shown on PPI and for the selected target at the lower right corner|
|display current own ship position, speed and course||this information is provided by a GPS connected to the radar (run a GPS in the simulator). This information is displayed at the upper left corner of the display|
|brilliance||place mouse cursor over the BRILLIANCE slice bar, click and hold the left mouse button, drag the cursor left-right to specify a desired value|
|gain adjustment||place mouse cursor over the GAIN slice bar, click and hold the left mouse button, drag the cursor left-right to specify a desired value|
|tuning the magnetron||place mouse cursor over the TUNE slice bar, click and hold the left mouse button, drag the cursor left-right to specify a desired value|
|suppress sea clutter||place mouse cursor over the SEA slice bar, click and hold the left mouse button, drag the cursor left-right to specify a desired value of suppression|
|suppress rain clutter||place mouse cursor over the RAIN slice bar, click and hold the left mouse button, drag the cursor left-right to specify a desired value of suppression|
|change FTC (fast time constant)||is used to suppress rain clutter far from the ship; place mouse cursor over the FTC slice bar, click and hold the left mouse button, drag the cursor left-right to specify a desired value of suppression|
|set navigation lines||
navigation lines (points connected by straight lines) simulate lines drawn on the display with a chinagraph pencil to exercise techniques
like PI (parallel indexing). Current set of navigation lines is shown/hidden by using NAV LINES [ON/OFF] button.
The lines can be edited in the edit mode switched on by [EDIT]. The cursor acquires a "pencil" shape with both (left and right) mouse buttons functional. Left mouse button clicks create a new point of the line in case an existing point is not hit; otherwise drag the mouse to move the existing point to a new position. Begin a new line a new click on [EDIT]. Exit edit mode by clicking [ON/OFF].
Right mouse button is used to delete a node (point) - click over a node to delete it.
All existing navigation lines as a whole can be moved in the "move" mode - click [MOVE]. Drag the left mouse button to move all the lines. Exit this mode by clicking [ON/OFF].