Path: CubeSat/Communications
% Link analysis computing bit error probability along an orbit.
The orbit is the spaceraft position in km. Each orbit position must
have a corresponding Julian day number. Modulations are 'BPSK' 'QPSK'
'DE-BPSK' 'DE-QPSK' 'D-BPSK' The output is the bit error probability as
a function of the orbit position. This will be zero if the ground
station is not visible. Assumes antenna is omni-directional.
Note that the TSky model is limited to frequencies between 2.5 and 60
GHz. If a frequency outside this is entered the closest endpoint is used.
Type LinkOrbitAnalysis for a demo.
Since version 8.
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Form:
bEP = LinkOrbitAnalysis( r, jD, d )
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Inputs
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r (3,:) Orbit Earth Fixed (km)
jD (1,:) Julian date (days)
d (1,1) Comm data structure
.fGHz (1,1) Frequency (GHz)
.diameterReceive (1,1) Receive antenna diameter (m)
.apertureEfficiency (1,1) Aperture efficiency
.polarizationAngle (1,1) Polarization angle (deg)
.attError (1,1) Average attitude error (deg)
.latitude (1,1) Ground station latitude (rad)
.longitude (1,1) Ground station longitude (rad)
.altitude (1,1) Ground station altitude (km)
.bitRate (1,1) Bit rate (bps)
.ampAntennaLoss (1,1) Antenna loss (dB)
.beamEdgeLoss (1,1) Beam edge loss (dB)
.powerTransmit (1,1) Transmit power (W)
.temperatureERX (1,1) ERX temperature (deg-K)
.temperatureFeeder (1,1) Feeder temperature (deg-K)
.lossFeeder (1,1) Feeder loss (dB)
.modulation (1,:) Modulation e.g. 'D-BPSK';
.horizonAngle (1,1) Horizon angle cutoff (rad)
.gainTransmit (1,1) Gain of satellite transmitter (dB)
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Outputs
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bEP (1,:) Bit error probability
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See also LatLonAltToEF, FrequencyToWavelength, DBSignalToPower, TSky,
TAntennaGround, TReceiver, GroundStationVisibility, BEP
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AeroUtils: Coord/ECIToEF AeroUtils: Coord/LatLonAltToEF Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/TimeLabl Common: Graphics/TitleS Common: Graphics/XLabelS Common: Graphics/YLabelS Common: Time/Date2JD Common: Time/JD2T Link: Coverage/GroundStationVisibility Link: LinkUtilities/BEP Link: LinkUtilities/DBSignalToPower Link: LinkUtilities/FrequencyToWavelength Link: RF/LossAtmosphericGas Link: RF/LossPolarization Link: RF/TAntennaGround Link: RF/TReceiver Link: RF/TSky Math: Linear/Mag SC: BasicOrbit/Period SC: BasicOrbit/RVFromKepler
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