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gaussianAntenna

Add Gaussian antennas

Description

gaussianAntenna(trx) adds Gaussian antenna to each transmitter or receiver in the vector trx using default parameters. The existing antennas in the transmitters or receivers are overwritten.

example

gaussianAntenna(trx,Name,Value) adds a Gaussian antenna to each transmitter or receiver in the vector trx using additional parameters specified by optional name-value pairs.

ant = gaussianAntenna(___) adds a Gaussian antenna to the transmitters or receivers and returns them in the vector ant.

Examples

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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);

Input Arguments

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Transmitter or receiver object to which the Gaussian antenna is added, specified as either a scalar or a vector.

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: 'DishDiameter',1.7 sets the dish diameter of the antenna to 1.7 meters upon creation.

This property is read-only.

You can set this property only when calling gaussianAntenna. After you call gaussianAntenna, this property is read-only.

Diameter of the Gaussian antenna dish in meters, specified as a scalar or a vector.

  • If DishDiameter is scalar, the same value is assigned to all transmitters or receivers in trx.

  • If DishDiameter is vector, the length of the vector must equal that of trx, and each transmitter or receiver in trx is assigned the corresponding element in DishDiameter vector.

This property is read-only.

You can set this property only when calling gaussianAntenna. After you call gaussianAntenna, this property is read-only.

Aperture efficiency of the Gaussian antenna, specified as a scalar in the range (0,1].

  • If ApertureEfficiency is scalar, the same value is assigned to all transmitters or receivers in trx.

  • If ApertureEfficiency is vector, the length of the vector must equal that of trx, and each transmitter or receiver in trx is assigned the corresponding element in ApertureEfficiency vector.

Output Arguments

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Gaussian antenna object added to the specified transmitter or receiver, returned as either a scalar or a vector.

Note

When AutoSimulate of the satellite scenario is false, you can call gaussianAntenna only when SimulationStatus is NotStarted. Otherwise, you must call the restart function to erase the simulation data and reset the SimulationStatus to NotStarted.

Version History

Introduced in R2021a