Transmitter
Transmitter object belonging to satellite scenario
Description
Transmitter defines a transmitter object belonging to a satellite scenario.
Creation
You can create Transmitter objects using the transmitter
method
of satellite
, groundStation
, or
gimbal
.
Properties
Name
— Transmitter name
"Transmitter
idx"
(default) | string scalar | string vector | character vector | cell array of character vectors
You can set this property only when calling the satellite
function.
After you call satellite
, this property is read-only.
Transmitter name, specified as a comma-separated pair consisting of
'Name'
and a string scalar, string vector, character vector or a cell
array of character vectors.
If only one Transmitter is added, specify
Name
as a string scalar or a character vector.If multiple Transmitters are added, specify
Name
as a string scalar, character vector, string vector or a cell array of character vectors. All Transmitters added as a string scalar or a character vector are assigned the same specified name. The number of elements in the string vector or cell array of character vector must equal the number of Transmitters being added. Each Transmitter is assigned the corresponding name from the vector or cell array.
In the default value, idx is the ID of the Transmitters added by the Transmitter object function.
Data Types: char
| string
ID
— Transmitter ID assigned by simulator
real positive scalar
This property is set internally by the simulator and is read-only.
Transmitter ID assigned by the simulator, specified as a positive scalar.
MountingLocation
— Mounting location with respect to parent
[0; 0; 0]
(default) | three-element vector | matrix
Mounting location with respect to the parent object in meters, specified as a three-element
vector or a matrix. The position vector is specified in the body frame of
the input parent
.
One Transmitter —
MountingLocation
is a three-element vector.Multiple Transmitters —
MountingLocation
can be a three-element vector or a matrix. When specified as a vector, the sameMountingLocation
s are assigned to all specified Transmitters. When specified as a matrix,MountingLocation
must contain three rows and the same number of columns as the Transmitters. The columns correspond to the mounting location of each specified Transmitter and the rows correspond to the mounting location coordinates in the parent body frame.
When the AutoSimulate
property of the satellite scenario is
false
, you can modify the
MountingLocation
property only when the
SimulationStatus
is NotStarted
. You
can use the restart
function to reset
SimulationStatus
to
NotStarted
, but doing so erases the simulation
data.
Data Types: double
MountingAngles
— Mounting orientation with respect to parent object
[0; 0; 0]
(default) | three-element row vector of positive numbers | matrix
Mounting orientation with respect to parent object in degrees, specified as a three-element row vector of positive numbers. The elements of the vector correspond to yaw, pitch, and roll in that order. Yaw, pitch, and roll are positive rotations about the parent's z - axis, intermediate y - axis and intermediate x - axis of the parent.
One Transmitter —
MountingAngles
is a three-element vector.Multiple Transmitters —
MountingAngles
can be a three-element vector or a matrix. When specified as a vector, the sameMountingAngles
s are assigned to all specified Transmitters. When specified as a matrix,MountingAngles
must contain three rows and the same number of columns as the Transmitters. The columns correspond to the mounting angles of each specified Transmitter and the rows correspond to the yaw, pitch, and roll angles parent body frame.
When the AutoSimulate
property of the satellite scenario is
false
, you can modify the MountingAngles
property only when the SimulationStatus
is NotStarted
. You can use the
restart
function to
reset SimulationStatus
to NotStarted
, but doing
so erases the simulation data.
Example: [0; 30; 60]
Data Types: double
Antenna
— Antenna object associated with Transmitter
scalar | vector
Antenna
object associated with the Transmitter,
specified as either a scalar or a vector. This object can be the default
gaussianAntenna
object, or one from the Antenna Toolbox or Phased Array
System Toolbox. The default Gaussian antenna has a dish diameter of 1 m and an aperture
efficiency of 0.65.
Antenna can be specified in Transmitter as a name-value pair
consisting of 'Antenna'
and a scalar, antenna or phased array objects.
If only one Transmitter is added,
Antenna
must be a scalar.If multiple Transmitters are added,
Antenna
as a vector. The same antenna is assigned to all Transmitters.
SystemLoss
— System loss in Transmitter
5
(default) | scalar | vector
System loss in dB, specified as a scalar or a vector.
System loss can be specified in Transmitter as a name-value pair consisting of
'SystemLoss'
and a scalar, or vector.
If only one Transmitter is added, specify
SystemLoss
as a scalar.If multiple Transmitters are added, specify
SystemLoss
as a scalar or a vector. WhenSystemLoss
is a scalar, the sameSystemLoss
is assigned to all Transmitters. WhenSystemLoss
is a vector, its length must equal the number of Transmitter and each element ofSystemLoss
is assigned to the corresponding Transmitter specified.
When AutoSimulate
property of the satellite scenario is
false
, you can modify the SystemLoss
value
while the SimulationStatus
is NotStarted
or
InProgress
.
Frequency
— Transmitter frequency
14e9
(default) | scalar | vector
Transmitter frequency in Hz, specified as a name-value pair consisting of 'Frequency' and a scalar double or a vector double.
If one Transmitter is added, the
Frequency
must be a scalar.If multiple Transmitters are added, the frequency value can be a scalar or a vector. All Transmitters added as a scalar are assigned the same specified
Frequency
. The length of the vector must equal the number of Transmitters added and each element ofFrequency
is assigned to the corresponding Transmitter specified.
When AutoSimulate
of the satellite scenario is false, you can modify the
Frequency
value while the SimulationStatus
is NotStarted
or
InProgress
.
BitRate
— Bit rate of transmitter
10
(default) | scalar | vector
Bit rate of the transmitter in Mbps, specified as a name-value pair consisting of 'BitRate' and a scalar double or a vector double.
If one Transmitter is added, the bit rate value must be a scalar.
If multiple Transmitters are added, the bit rate value can be a scalar or a vector. All Transmitters added as a scalar are assigned the same specified
BitRate
. The length of the vector must equal the number of Transmitters added and each element ofBitRate
is assigned to the corresponding Transmitter specified.
When AutoSimulate
of the satellite scenario is false
, you
can modify the BitRate
value while the SimulationStatus
is NotStarted
or
InProgress
.
Power
— Power of high power amplifier
12
(default) | scalar | vector
Power of the high power amplifier in dbW, specified as a name-value pair consisting of 'Power' and a scalar double or a vector double.
If one Transmitter is added, the power value must be a scalar.
If multiple Transmitters are added, the power value can be a scalar or a vector. All Transmitters added as a scalar are assigned the same specified
Power
. The length of the vector must equal the number of Transmitters added and each element ofPower
is assigned to the corresponding Transmitter specified.
When AutoSimulate
of the satellite scenario is
false, you can modify the Power
value while the
SimulationStatus
is
NotStarted
or
InProgress
.
Links
— Link analysis objects
row vector of Link
objects
This property is read-only.
Link analysis objects, specified as a row vector Link
objects.
Object Functions
aer | Calculate azimuth angle, elevation angle, and range of another satellite or ground station in NED frame |
gaussianAntenna | Add Gaussian antennas |
link | Add link analysis objects to transmitter |
pattern | Plot 3-D radiation pattern of antenna |
pointAt | Specify the target at which the satellite is pointed |
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
See Also
Objects
Functions
play
|show
|hide
|groundStation
|access
|receiver
|transmitter
|pointAt
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