FieldOfView
Description
The FieldOfView object defines a field of view object belonging to a satellite scenario.
You can use the field of view object to visualize the field of view of the conical sensor. It draws a contour on the Earth that represents the line of intersection of the conical region defining the field of view of the sensor and the Earth. For more information on how to use field of view object in a real scenario, see, Satellite Constellation Access to Ground Station.
Creation
You can create a FieldOfView
object using the fieldOfView
object function
of the ConicalSensor
object.
Properties
LineWidth
— Visual width of field of view contour
1
(default) | scalar in the range (0 10]
Visual width of the field of view contour in pixels, specified as a scalar in the range (0 10].
The line width cannot be thinner than the width of a pixel. If you set the line width to a value that is less than the width of a pixel on your system, the line displays as one pixel wide.
LineColor
— Color of field of view contour
[0 1 0]
(default) | RGB triplet | RGB triplet
| string scalar of color name
| character vector of color name
Color of field of view contour, specified as an RGB triplet, hexadecimal color code, a color name, or a short name.
For a custom color, specify an RGB triplet or a hexadecimal color code.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
, for example,[0.4 0.6 0.7]
.A hexadecimal color code is a string scalar or character vector that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Therefore, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|---|---|
"red" | "r" | [1 0 0] | "#FF0000" | |
"green" | "g" | [0 1 0] | "#00FF00" | |
"blue" | "b" | [0 0 1] | "#0000FF" | |
"cyan"
| "c" | [0 1 1] | "#00FFFF" | |
"magenta" | "m" | [1 0 1] | "#FF00FF" | |
"yellow" | "y" | [1 1 0] | "#FFFF00" | |
"black" | "k" | [0 0 0] | "#000000" | |
"white" | "w" | [1 1 1] | "#FFFFFF" | |
"none" | Not applicable | Not applicable | Not applicable | No color |
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB® uses in many types of plots.
RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|
[0 0.4470 0.7410] | "#0072BD" | |
[0.8500 0.3250 0.0980] | "#D95319" | |
[0.9290 0.6940 0.1250] | "#EDB120" | |
[0.4940 0.1840 0.5560] | "#7E2F8E" | |
[0.4660 0.6740 0.1880] | "#77AC30" | |
[0.3010 0.7450 0.9330] | "#4DBEEE" | |
[0.6350 0.0780 0.1840] | "#A2142F" |
Example: 'blue'
Example: [0 0 1]
Example: '#0000FF'
VisibilityMode
— Visibility mode of field of view contour
'inherit'
(default) | 'manual'
Visibility mode of the field of view contour, specified as one of these values:
'inherit'
— Visibility of the graphic matches that of the parent'manual'
— Visibility of the graphic is not inherited and is independent of that of the parent
Object Functions
Examples
Calculate Maximum Revisit Time of Satellite
Create a satellite scenario with a start time of 15-June-2021 8:55:00 AM UTC and a stop time of five days later. Set the simulation sample time to 60
seconds.
startTime = datetime(2021,6,21,8,55,0);
stopTime = startTime + days(5);
sampleTime = 60; % seconds
sc = satelliteScenario(startTime,stopTime,sampleTime)
sc = satelliteScenario with properties: StartTime: 21-Jun-2021 08:55:00 StopTime: 26-Jun-2021 08:55:00 SampleTime: 60 AutoSimulate: 1 Satellites: [1×0 matlabshared.satellitescenario.Satellite] GroundStations: [1×0 matlabshared.satellitescenario.GroundStation] Platforms: [1×0 matlabshared.satellitescenario.Platform] Viewers: [0×0 matlabshared.satellitescenario.Viewer] AutoShow: 1
Add a satellite to the scenario using Keplerian orbital elements.
semiMajorAxis = 7878137; % meters eccentricity = 0; inclination = 50; % degrees rightAscensionOfAscendingNode = 0; % degrees argumentOfPeriapsis = 0; % degrees trueAnomaly = 50; % degrees sat = satellite(sc,semiMajorAxis,eccentricity,inclination,rightAscensionOfAscendingNode, ... argumentOfPeriapsis,trueAnomaly)
sat = Satellite with properties: Name: Satellite 1 ID: 1 ConicalSensors: [1x0 matlabshared.satellitescenario.ConicalSensor] Gimbals: [1x0 matlabshared.satellitescenario.Gimbal] Transmitters: [1x0 satcom.satellitescenario.Transmitter] Receivers: [1x0 satcom.satellitescenario.Receiver] Accesses: [1x0 matlabshared.satellitescenario.Access] Eclipse: [1x0 Aero.satellitescenario.Eclipse] GroundTrack: [1x1 matlabshared.satellitescenario.GroundTrack] Orbit: [1x1 matlabshared.satellitescenario.Orbit] CoordinateAxes: [1x1 matlabshared.satellitescenario.CoordinateAxes] OrbitPropagator: sgp4 MarkerColor: [0.059 1 1] MarkerSize: 6 ShowLabel: true LabelFontColor: [1 1 1] LabelFontSize: 15 Visual3DModel: Visual3DModelScale: 1
Add a ground station, which represents the location to be photographed, to the scenario.
gs = groundStation(sc,Name="Location to Photograph", ... Latitude=42.3001,Longitude=-71.3504) % degrees
gs = GroundStation with properties: Name: Location to Photograph ID: 2 Latitude: 42.3001 degrees Longitude: -71.3504 degrees Altitude: 0 meters MinElevationAngle: 0 degrees ConicalSensors: [1x0 matlabshared.satellitescenario.ConicalSensor] Gimbals: [1x0 matlabshared.satellitescenario.Gimbal] Transmitters: [1x0 satcom.satellitescenario.Transmitter] Receivers: [1x0 satcom.satellitescenario.Receiver] Accesses: [1x0 matlabshared.satellitescenario.Access] Eclipse: [1x0 Aero.satellitescenario.Eclipse] CoordinateAxes: [1x1 matlabshared.satellitescenario.CoordinateAxes] MarkerColor: [1 0.4118 0.1608] MarkerSize: 6 ShowLabel: true LabelFontColor: [1 1 1] LabelFontSize: 15
Add a gimbal to the satellite. You can steer this gimbal independently of the satellite.
g = gimbal(sat)
g = Gimbal with properties: Name: Gimbal 3 ID: 3 MountingLocation: [0; 0; 0] meters MountingAngles: [0; 0; 0] degrees ConicalSensors: [1x0 matlabshared.satellitescenario.ConicalSensor] Transmitters: [1x0 satcom.satellitescenario.Transmitter] Receivers: [1x0 satcom.satellitescenario.Receiver] CoordinateAxes: [1x1 matlabshared.satellitescenario.CoordinateAxes]
Track the location to be photographed using the gimbal.
pointAt(g,gs);
Add a conical sensor to the gimbal. This sensor represents the camera. Set the field of view to 60 degrees.
camSensor = conicalSensor(g,MaxViewAngle=60)
camSensor = ConicalSensor with properties: Name: Conical sensor 4 ID: 4 MountingLocation: [0; 0; 0] meters MountingAngles: [0; 0; 0] degrees MaxViewAngle: 60 degrees Accesses: [1x0 matlabshared.satellitescenario.Access] FieldOfView: [0x0 matlabshared.satellitescenario.FieldOfView] CoordinateAxes: [1x1 matlabshared.satellitescenario.CoordinateAxes]
Add access analysis to the conical sensor between the camera and the location to be photographed.
ac = access(camSensor,gs)
ac = Access with properties: Sequence: [4 2] LineWidth: 3 LineColor: [0.3922 0.8314 0.0745]
Visualize the field of view of the camera by using the Satellite Scenario Viewer.
v = satelliteScenarioViewer(sc); fieldOfView(camSensor);
Determine the intervals during which the camera can see the geographical site.
t = accessIntervals(ac)
t=35×8 table
Source Target IntervalNumber StartTime EndTime Duration StartOrbit EndOrbit
__________________ ________________________ ______________ ____________________ ____________________ ________ __________ ________
"Conical sensor 4" "Location to Photograph" 1 21-Jun-2021 10:38:00 21-Jun-2021 10:55:00 1020 1 2
"Conical sensor 4" "Location to Photograph" 2 21-Jun-2021 12:36:00 21-Jun-2021 12:58:00 1320 2 3
"Conical sensor 4" "Location to Photograph" 3 21-Jun-2021 14:37:00 21-Jun-2021 15:01:00 1440 3 4
"Conical sensor 4" "Location to Photograph" 4 21-Jun-2021 16:41:00 21-Jun-2021 17:04:00 1380 5 5
"Conical sensor 4" "Location to Photograph" 5 21-Jun-2021 18:44:00 21-Jun-2021 19:07:00 1380 6 6
"Conical sensor 4" "Location to Photograph" 6 21-Jun-2021 20:46:00 21-Jun-2021 21:08:00 1320 7 7
"Conical sensor 4" "Location to Photograph" 7 21-Jun-2021 22:50:00 21-Jun-2021 23:04:00 840 8 8
"Conical sensor 4" "Location to Photograph" 8 22-Jun-2021 09:51:00 22-Jun-2021 10:02:00 660 13 13
"Conical sensor 4" "Location to Photograph" 9 22-Jun-2021 11:46:00 22-Jun-2021 12:07:00 1260 14 15
"Conical sensor 4" "Location to Photograph" 10 22-Jun-2021 13:46:00 22-Jun-2021 14:10:00 1440 15 16
"Conical sensor 4" "Location to Photograph" 11 22-Jun-2021 15:49:00 22-Jun-2021 16:13:00 1440 16 17
"Conical sensor 4" "Location to Photograph" 12 22-Jun-2021 17:53:00 22-Jun-2021 18:16:00 1380 18 18
"Conical sensor 4" "Location to Photograph" 13 22-Jun-2021 19:55:00 22-Jun-2021 20:18:00 1380 19 19
"Conical sensor 4" "Location to Photograph" 14 22-Jun-2021 21:58:00 22-Jun-2021 22:16:00 1080 20 20
"Conical sensor 4" "Location to Photograph" 15 23-Jun-2021 10:56:00 23-Jun-2021 11:16:00 1200 26 27
"Conical sensor 4" "Location to Photograph" 16 23-Jun-2021 12:56:00 23-Jun-2021 13:19:00 1380 27 28
⋮
Calculate the maximum revisit time in hours.
startTimes = t.StartTime;
endTimes = t.EndTime;
revisitTimes = hours(startTimes(2:end) - endTimes(1:end-1));
maxRevisitTime = max(revisitTimes) % hours
maxRevisitTime = 12.666666666666666
Visualize the revisit times that the camera photographs of the location.
play(sc);
Version History
Introduced in R2021a
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