fieldOfView
Description
fieldOfView(
adds a sensor
)FieldOfView
object to the
specified conical sensor, and draws contours on the Earth. Each contour represents the field
of view of a conical sensor in sensor
based on the current state of the
scenario.
Locations inside the contour are inside the field of view. The field of view contours
are drawn on all open satellite scenario viewers. The contours are the lines of intersection
of the surface of the earth and the field of view cone. The half angle of the field of view
cone equals the MaxViewAngle
property of the conical sensor, and the axis of the
cone is the z-axis (or boresight) of the conical sensor. The vertex of
the cone is located at the position of the conical sensor. The cone becomes wider along the
positive body z-axis of the conical sensor.
fieldOfView(
specifies options by using one or more name-value arguments.sensor
,Name,Value
)
returns a
vector of handles to the added field of view graphic objects. Specify any input combination
from previous syntaxes.fov
= fieldOfView(___)
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] 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] GroundTrack: [1x1 matlabshared.satellitescenario.GroundTrack] Orbit: [1x1 matlabshared.satellitescenario.Orbit] OrbitPropagator: sgp4 MarkerColor: [0.059 1 1] MarkerSize: 6 ShowLabel: true LabelFontColor: [1 1 1] LabelFontSize: 15
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: 42.3 degrees Longitude: -71.35 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] 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]
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]
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 15:50:00 22-Jun-2021 16:13:00 1380 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 = 12.6667
Visualize the revisit times that the camera photographs of the location.
play(sc);
Input Arguments
sensor
— Conical sensor
ConicalSensor
object
Conical sensor, specified as a ConicalSensor
object.
Name-Value Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Name-value arguments must appear after other arguments, but the order of the
pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: 'LineWidth',2.5
sets the line width of the field of view to
2.5 pixels.
Viewer
— Satellite scenario viewer
vector of satelliteScenarioViewer
objects (default) | scalar satelliteScenarioViewer
object | array of satelliteScenarioViewer
objects
Satellite scenario viewer, specified as a scalar, vector, or array of satelliteScenarioViewer
objects. If the AutoSimulate
property of the scenario is false
,
adding a satellite to the scenario disables any previously available timeline and
playback widgets.
NumContourPoints
— Number of contour points
40
(default) | integer greater than or equal to 4
Number of contour points used to draw the contour of the field of view, specified as an integer greater than or equal to 4.
Data Types: double
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'
Output Arguments
fov
— Field of view of conical sensor
row vector of FieldOfView
objects
Field of view of conical sensor, returned as a row vector of
FieldOfView
objects.
Note
When the AutoSimulate
property is set to false
, the SimulationStatus
must equal NotStarted
to call the
fieldOfView
function. Otherwise, use the restart
function to reset
the SimulationStatus
to NotStarted
, which erases the
simulation data.
Version History
Introduced in R2021a
See Also
Objects
Functions
show
|play
|hide
|access
|groundStation
|conicalSensor
|transmitter
|receiver
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