linkIntervals

Intervals during which link is closed

Syntax

int = linkIntervals(lnk)

Description

int = linkIntervals(lnk) returns a table of intervals during which the link between the first node and last node in each link object input vector is closed.

Examples

Obtain Downlink Closed Intervals Between Satellite and Ground Station

Create a satellite scenario object.

startTime = datetime(2020,10,13,7,25,0);
stopTime = startTime + days(1);
sampleTime = 60;                                       % seconds
sc = satelliteScenario(startTime,stopTime,sampleTime);

Add a satellite to the scenario.

semiMajorAxis = 10000000;                               % meters
eccentricity = 0;
inclination = 10;                                       % degrees
rightAscensionOfAscendingNode = 0;                      % degrees
argumentOfPeriapsis = 0;                                % degrees
trueAnomaly = 210;                                      % degrees
sat = satellite(sc,semiMajorAxis,eccentricity, ...
    inclination,rightAscensionOfAscendingNode, ...
    argumentOfPeriapsis,trueAnomaly);

Add a transmitter to the satellite.

tx = transmitter(sat);

Add a ground station to the scenario.

latitude = 0;                             % degrees
longitude = 30;                           % degrees
gs = groundStation(sc,latitude,longitude);

Add a receiver to the ground station.

rx = receiver(gs,"MountingAngles",[0; 180; 0]);

Create a downlink.

lnk = link(tx,rx);

Obtain the intervals table of the closed downlink.

intervals = linkIntervals(lnk)

intervals =

  0x8 empty table

Input Arguments

lnk — Link analysis

Link object vector | Link object scalar

Link analysis object, specified as a Link object vector or scalar.

Outputs Arguments

int — Intervals during which link is closed

table

Intervals during which the link is closed, returned as a table.

Each row of the table denotes a specific interval, and the columns of the table are named Source, Target, IntervalNumber, StartTime, EndTime, Duration (in seconds), StartOrbit, and EndOrbit. Source and Target are the names of the first and last node, respectively, that define the link analysis.

• If Source is directly or indirectly attached to a satellite, then StartOrbit and EndOrbit correspond to the satellite associated with Source.

• If Target is directly or indirectly attached to a satellite, then StartOrbit and EndOrbit correspond to the satellite associated with the Target. Otherwise, StartOrbit and EndOrbit are NaN because they are associated with ground stations.

Note

When AutoSimulate of the satellite scenario is true, the intervals between StartTime and StopTime are returned. When it is false, the intervals between StartTime and SimulationTime are returned.

Version History

Introduced in R2021a