groundStation

Add ground station to satellite scenario

Since R2021a

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Syntax

groundStation(scenario)
groundStation(scenario,lat,lon)
groundStation(___,Name,Value)
gs = groundStation(___)

Description

groundStation(scenario) adds a default GroundStation object to the specified satellite scenario.

example

groundStation(scenario,lat,lon) sets the Latitude and Longitude properties of the ground station to lat and lon, respectively. lat and lon must be of the same length. This length specifies the number of ground stations that the function adds to the input scenario. Together, lat and lon indicate the locations of the ground stations.

groundStation(___,Name,Value) sets options using one or more name-value arguments in addition to any input argument combination from previous syntaxes. For example, 'MinElevationAngle',10 specifies a minimum elevation angle of 10 degrees.

gs = groundStation(___) returns a vector of handles to the added ground stations. Specify any input argument combination from previous syntaxes.

Examples

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Open Live Script

Create a satellite scenario and add ground stations from latitudes and longitudes.

startTime = datetime(2020,5,1,11,36,0);
stopTime = startTime + days(1);
sampleTime = 60;
sc = satelliteScenario(startTime,stopTime,sampleTime);
lat = 10;
lon = -30;
gs = groundStation(sc,lat,lon);

Add satellites using Keplerian elements.

semiMajorAxis = 10000000;
eccentricity = 0;
inclination = 10; 
rightAscensionOfAscendingNode = 0; 
argumentOfPeriapsis = 0; 
trueAnomaly = 0; 
sat = satellite(sc,semiMajorAxis,eccentricity,inclination, ...
        rightAscensionOfAscendingNode,argumentOfPeriapsis,trueAnomaly);

Add access analysis to the scenario and obtain the table of intervals of access between the satellite and the ground station.

ac = access(sat,gs);
intvls = accessIntervals(ac)
intvls=8×8 table
       Source              Target          IntervalNumber         StartTime                EndTime           Duration    StartOrbit    EndOrbit
    _____________    __________________    ______________    ____________________    ____________________    ________    __________    ________

    "Satellite 2"    "Ground station 1"          1           01-May-2020 11:36:00    01-May-2020 12:04:00      1680          1            1    
    "Satellite 2"    "Ground station 1"          2           01-May-2020 14:20:00    01-May-2020 15:11:00      3060          1            2    
    "Satellite 2"    "Ground station 1"          3           01-May-2020 17:27:00    01-May-2020 18:18:00      3060          3            3    
    "Satellite 2"    "Ground station 1"          4           01-May-2020 20:34:00    01-May-2020 21:25:00      3060          4            4    
    "Satellite 2"    "Ground station 1"          5           01-May-2020 23:41:00    02-May-2020 00:31:00      3000          5            5    
    "Satellite 2"    "Ground station 1"          6           02-May-2020 02:50:00    02-May-2020 03:39:00      2940          6            6    
    "Satellite 2"    "Ground station 1"          7           02-May-2020 05:58:00    02-May-2020 06:47:00      2940          7            7    
    "Satellite 2"    "Ground station 1"          8           02-May-2020 09:06:00    02-May-2020 09:56:00      3000          8            9

Play the scenario to visualize the ground stations.

play(sc)

Input Arguments

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Satellite scenario, specified as a satelliteScenario object.

Latitude and longitude of the ground station, specified as a real-valued scalar or real-valued vector.

Name-Value Arguments

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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: 'MinElevationAngle',10 specifies a minimum elevation angle of 10 degrees.

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.

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

groundStation 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 groundStation is added, specify Name as a string scalar or a character vector.

  • If multiple groundStations are added, specify Name as a string scalar, character vector, string vector or a cell array of character vectors. All groundStations 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 groundStations being added. Each groundStation is assigned the corresponding name from the vector or cell array.

In the default value, idx is the ID assigned by satellite scenario.

Data Types: char | string

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

Geodetic latitude of ground stations, specified as a scalar. Values must be in the range [-90, 90].

  • If you add only one ground station, specify Latitude as a scalar double.

  • If you add multiple ground stations, specify Latitude as a vector double whose length is equal to the number of ground stations being added.

When latitude and longitude are specified as lat, lon inputs to groundStation, Latitude specified as a name-value argument takes precedence.

Data Types: double

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

Geodetic longitude of ground stations, specified as a scalar or a vector. Values must be in the range [-180, 180].

  • If you add only one ground station, specify longitude as a scalar.

  • If you add multiple ground stations, specify longitude as a vector whose length is equal to the number of ground stations being added.

When longitude and longitude are specified as lat, lon inputs to groundStation, longitude specified as a name-value argument takes precedence.

Data Types: double

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

Altitude of ground stations, specified as a scalar or a vector.

  • If you specify Altitude as a scalar, the value is assigned to each ground station in the groundStation.

  • If you specify Altitude as a vector, the vector length must be equal to the number of ground stations in the groundStation.

When latitude and longitude are specified as lat, lon inputs to groundStation, Latitude specified as a name-value argument takes precedence.

Data Types: double

Minimum elevation angle of a satellite for the satellite to be visible from the ground station, and for the ground station to be visible from the satellite in degrees, specified as a scalar or row vector. Values must be in the range [–90, 90]. For access and link closure to be possible, the elevation angle must be at least equal to the value specified in MinElevationAngle.

  • If you specify MinElevationAngle as a scalar, the value is assigned to each ground station in the groundStation.

  • If you specify MinElevationAngle as a vector, the vector length must be equal to the number of ground stations in the groundStation.

When the AutoSimulate property of the satellite scenario is false, MinElevationAngle property can be modified while the SimulationStatus is NotStarted or InProgress.

Data Types: double

Elevation angles for visibility mask in degrees, specified as a scalar, an N-element row vector , or a 2-D matrix. This property works with MaskAzimuthEdges to create a visibility mask. The length of the MaskElevationAngle row vector must be one shorter than the MaskAzimuthEdges row vector.

The value of all MaskElevationAngle angles must be from -90 to 90. N is m-1, where m is the number of elements in MaskAzimuthEdges.

  • If MaskElevationAngle is a scalar double or row vector double, this value is assigned to each ground station in the GroundStation object.

  • If MaskElevationAngle is a 2-D matrix double, the number of rows must be equal to the number of ground stations in the GroundStation object.

When the AutoSimulate property of the satellite scenario is false, MaskElevationAngle property can be modified while the SimulationStatus is NotStarted or InProgress.

Data Types: double

Azimuth angles for the visibility mask in degrees, specified as a row vector of angles, or a 2-D matrix. This parameter works with MaskElevationAngle property to create a visibility mask. The length of the MaskAzimuthEdges property row vector must be one longer than the MaskElevationAngle property row vector. The value of all MaskAzimuthEdges angles must be from 0 to 360 degrees.

  • If MaskAzimuthEdges is a row vector, this value is assigned to each ground station added to the GroundStation object.

  • If MaskAzimuthEdges is a 2-D matrix, the number of rows in the matrix must be equal to the number of ground stations in the GroundStation object.

  • If MaskAzimuthEdges is not specified, this value is automatically generated for each ground station as a linearly spaced row vector from 0 to 360 degrees. The row vector is one value longer than the corresponding MaskElevationAngle row vector.

When the AutoSimulate property of the satellite scenario is false, MaskAzimuthEdges property can be modified while the SimulationStatus is NotStarted or InProgress.

Data Types: double

Output Arguments

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Ground station in the scenario, returned as a GroundStation object belonging to the satellite scenario specified by the input scenario.

You can modify the GroundStation object by changing its property values. The name-value arguments used when calling this function correspond to property names.

Version History

Introduced in R2021a

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See Also

Objects

Functions

Topics