Link
Link analysis object belonging to Transmitter
Description
The Link
object defines a link analysis object belonging
to Transmitter
.
Creation
You can create a Link
object using the link
object
function of the Transmitter
or
Receiver
objects.
Properties
Sequence
— Transmitter or receiver ID
vector of positive numbers
You can set this property only when calling Link. After you call Link, this property is read-only.
Transmitter or receiver ID, specified as a vector of positive numbers.
LineWidth
— Visual width of link line
1
(default) | scalar in the range (0 10]
Visual width of link line 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 link line
[0 1 0]
(default) | RGB triplet
| string scalar of color name
| character vector of color name
Color of the link line, specified as an RGB triplet, a 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 character vector or a string scalar that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Thus, 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'
Object Functions
show | Show object in satellite scenario viewer |
ebno | Eb/No at final node of link |
linkPercentage | Percentage of time when link between first and last node in link analysis is closed |
linkStatus | Status of link closure between first and last node |
linkIntervals | Intervals during which link is closed |
hide | Hides satellite scenario entity from viewer |
Examples
Determine Times of Availability for Satellite Link Between Two Ground Stations
Create a satellite scenario object.
startTime = datetime(2020,11,25,0,0,0);
stopTime = startTime + days(1);
sampleTime = 60; % seconds
sc = satelliteScenario(startTime,stopTime,sampleTime)
sc = satelliteScenario with properties: StartTime: 25-Nov-2020 StopTime: 26-Nov-2020 SampleTime: 60 Viewers: [0×0 matlabshared.satellitescenario.Viewer] Satellites: [1×0 matlabshared.satellitescenario.Satellite] GroundStations: [1×0 matlabshared.satellitescenario.GroundStation] AutoShow: 1
Add a satellite to the scenario.
semiMajorAxis = 10000000; % meters eccentricity = 0; inclination = 60; % degrees rightAscensionOfAscendingNode = 0; % degrees argumentOfPeriapsis = 0; % degrees trueAnomaly = 0; % degrees sat = satellite(sc,semiMajorAxis,eccentricity,inclination,rightAscensionOfAscendingNode,... argumentOfPeriapsis,trueAnomaly,"Name","Satellite");
Add a transmitter to the satellite.
frequency = 27e9; % Hz power = 20; % dBW bitRate = 20; % Mbps systemLoss = 3; % dB txSat = transmitter(sat,"Name","Satellite Transmitter","Frequency",frequency,"power",power,... "BitRate",bitRate,"SystemLoss",systemLoss)
txSat = Transmitter with properties: Name: Satellite Transmitter ID: 2 MountingLocation: [0; 0; 0] meters MountingAngles: [0; 0; 0] degrees Antenna: [1x1 satcom.satellitescenario.GaussianAntenna] SystemLoss: 3 decibels Frequency: 2.7e+10 Hertz BitRate: 20 Mbps Power: 20 decibel-watts Links: [1x0 satcom.satellitescenario.Link]
Add a receiver to the satellite.
gainToNoiseTemperatureRatio = 5; % dB/K systemLoss = 3; % dB rxSat = receiver(sat,"Name","Satellite Receiver","GainToNoiseTemperatureRatio",gainToNoiseTemperatureRatio,... "SystemLoss",systemLoss)
rxSat = Receiver with properties: Name: Satellite Receiver ID: 3 MountingLocation: [0; 0; 0] meters MountingAngles: [0; 0; 0] degrees Antenna: [1x1 satcom.satellitescenario.GaussianAntenna] SystemLoss: 3 decibels GainToNoiseTemperatureRatio: 5 decibels/Kelvin RequiredEbNo: 10 decibels
Specify the antenna specifications of the repeater.
dishDiameter = 0.5; % meters apertureEfficiency = 0.5; gaussianAntenna(txSat,"DishDiameter",dishDiameter,"ApertureEfficiency",apertureEfficiency); gaussianAntenna(rxSat,"DishDiameter",dishDiameter,"ApertureEfficiency",apertureEfficiency);
Add two ground stations to the scenario.
gs1 = groundStation(sc,"Name","Ground Station 1"); latitude = 52.2294963; % degrees longitude = 0.1487094; % degrees gs2 = groundStation(sc,latitude,longitude,"Name","Ground Station 2");
Add gimbals to the ground stations. These gimbals enable you to steer the ground station antennas to track the satellite.
mountingLocation = [0; 0; -5]; % meters mountingAngles = [0; 180; 0]; % degrees gimbalGs1 = gimbal(gs1,"MountingLocation",mountingLocation,"MountingAngles",mountingAngles); gimbalGs2 = gimbal(gs2,"MountingLocation",mountingLocation,"MountingAngles",mountingAngles);
Track the satellite using the gimbals.
pointAt(gimbalGs1,sat); pointAt(gimbalGs2,sat);
Add a transmitter to gimbal gimbalGs1
.
frequency = 30e9; % Hz power = 40; % dBW bitRate = 20; % Mbps txGs1 = transmitter(gimbalGs1,"Name","Ground Stationn 1 Transmitter","Frequency",frequency,... "Power",power,"BitRate",bitRate);
Add a receiver to gimbal gimbalGs2
.
requiredEbNo = 14; % dB rxGs2 = receiver(gimbalGs2,"Name","Ground Station 2 Receiver","RequiredEbNo",requiredEbNo);
Define the antenna specifications of the ground stations.
dishDiameter = 5; % meters gaussianAntenna(txGs1,"DishDiameter",dishDiameter); gaussianAntenna(rxGs2,"DishDiameter",dishDiameter);
Add link analysis to transmitter txGs1
.
lnk = link(txGs1,rxSat,txSat,rxGs2)
lnk = Link with properties: Sequence: [8 3 2 9] LineWidth: 1 LineColor: [0 1 0]
Determine the times when ground station gs1
can send data to ground station gs2
via the satellite.
linkIntervals(lnk)
ans = 0×8 empty table
Visualize the link using the Satellite Scenario Viewer.
play(sc);
Version History
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