linkIntervals
Description
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); pattern(tx);
Add a ground station to the scenario.
latitude = 0; % degrees longitude = 30; % degrees gs = groundStation(sc,latitude,longitude); gb = gimbal(gs);
Add a receiver to the ground station.
rx = receiver(gb); pattern(rx,tx.Frequency);
Create a downlink.
pointAt(gb,sat); pointAt(sat,gs); lnk = link(tx,rx);
Obtain the intervals table of the closed downlink.
intervals = linkIntervals(lnk)
intervals=8×8 table
Source Target IntervalNumber StartTime EndTime Duration StartOrbit EndOrbit
_______________ ____________ ______________ ____________________ ____________________ ________ __________ ________
"Transmitter 2" "Receiver 5" 1 13-Oct-2020 07:25:00 13-Oct-2020 07:26:00 60 1 1
"Transmitter 2" "Receiver 5" 2 13-Oct-2020 09:42:00 13-Oct-2020 10:33:00 3060 1 2
"Transmitter 2" "Receiver 5" 3 13-Oct-2020 12:50:00 13-Oct-2020 13:41:00 3060 2 3
"Transmitter 2" "Receiver 5" 4 13-Oct-2020 15:58:00 13-Oct-2020 16:49:00 3060 4 4
"Transmitter 2" "Receiver 5" 5 13-Oct-2020 19:05:00 13-Oct-2020 19:56:00 3060 5 5
"Transmitter 2" "Receiver 5" 6 13-Oct-2020 22:12:00 13-Oct-2020 23:03:00 3060 6 6
"Transmitter 2" "Receiver 5" 7 14-Oct-2020 01:20:00 14-Oct-2020 02:10:00 3000 7 7
"Transmitter 2" "Receiver 5" 8 14-Oct-2020 04:27:00 14-Oct-2020 05:18:00 3060 8 8
Input Arguments
lnk
— Link analysis
Link
object vector | Link
object scalar
Link analysis object, specified as a Link
object
vector or scalar.
Output Arguments
interval
— Link closed intervals
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 as 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 link analysis.
If
Source
is directly or indirectly attached to a satellite, thenStartOrbit
andEndOrbit
correspond to the satellite associated withSource
.If
Target
is directly or indirectly attached to a satellite, thenStartOrbit
andEndOrbit
correspond to the satellite associated withTarget
. Otherwise,StartOrbit
andEndOrbit
areNaN
because they are associated with ground stations.
Note
When the AutoSimulate
property of satellite scenario is true
, the
link intervals between StartTime
and StopTime
are returned. When the property is false
, the link
intervals between StartTime
and SimulationTime
are returned.
Version History
Introduced in R2021a
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