accessIntervals

Intervals during which access status is true

Since R2021a

Syntax

acinterval = accessIntervals(ac)

Description

acinterval = accessIntervals(ac) returns a table of intervals during which the access status corresponding to each access object in the input vector, ac, is true.

Examples

Add Ground Stations to Scenario and Visualize Access Intervals

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)

Add Platforms to Scenario and Visualize Access Intervals

Create a satellite scenario.

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

Add a platform using the given trajectory in the satellite scenario.

trajectory = geoTrajectory([40.6413,-73.7781,10600;32.3634,-64.7053,10600],[0,2*3600],AutoPitch=true,AutoBank=true);
pltf = platform(sc,trajectory);

Add a satellite 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 platform.

ac = access(sat,pltf);
intvls = accessIntervals(ac)

intvls=7×8 table
       Source           Target       IntervalNumber         StartTime                EndTime           Duration    StartOrbit    EndOrbit
    _____________    ____________    ______________    ____________________    ____________________    ________    __________    ________

    "Satellite 2"    "Platform 1"          1           01-May-2020 14:07:00    01-May-2020 14:54:00      2820          1            2    
    "Satellite 2"    "Platform 1"          2           01-May-2020 17:11:00    01-May-2020 18:01:00      3000          3            3    
    "Satellite 2"    "Platform 1"          3           01-May-2020 20:16:00    01-May-2020 21:06:00      3000          4            4    
    "Satellite 2"    "Platform 1"          4           01-May-2020 23:22:00    02-May-2020 00:11:00      2940          5            5    
    "Satellite 2"    "Platform 1"          5           02-May-2020 02:31:00    02-May-2020 03:15:00      2640          6            6    
    "Satellite 2"    "Platform 1"          6           02-May-2020 05:43:00    02-May-2020 06:22:00      2340          7            7    
    "Satellite 2"    "Platform 1"          7           02-May-2020 08:54:00    02-May-2020 09:33:00      2340          8            8    

Play the scenario to visualize the platform and the satellite.

play(sc)

Input Arguments

ac — Access analysis

row vector of Access objects

Access analysis, specified as a row vector of Access objects.

Outputs Arguments

acinterval — Intervals during which access is true

table

Intervals during which access is true, returned as a table.

Each row of the table denotes a specific interval. 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, which define the access analysis.

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

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

Note

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

Version History

Introduced in R2021a