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.
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Form:
bEP = LinkOrbitAnalysis( r, jD, d )
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Inputs
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r (3,:) Orbit, ECI frame (km)
jD (1,:) Julian date (days)
d (.) Comm data structure
.fGHz (1,1) Frequency (GHz)
.modulation (1,:) Modulation e.g. 'D-BPSK';
.bitRate (1,1) Bit rate (bps)
Satellite transmitter:
.ampAntennaLoss (1,1) Antenna loss (dB)
.beamEdgeLoss (1,1) Beam edge loss (dB)
.gainTransmit (1,1) Gain of satellite transmitter (dB)
.powerTransmit (1,1) Transmit power (W)
.polarizationAngle (1,1) Polarization angle mismatch (deg)
Ground station:
.latitude (1,1) Ground station latitude (rad)
.longitude (1,1) Ground station longitude (rad)
.altitude (1,1) Ground station altitude (km)
.diameterReceive (1,1) Receive antenna diameter (m)
.apertureEfficiency (1,1) Aperture efficiency
.temperatureERX (1,1) Effective receiver noise temperature (deg-K)
.temperatureFeeder (1,1) Feeder temperature (deg-K)
.lossFeeder (1,1) Feeder loss (dB)
.horizonAngle (1,1) Horizon angle cutoff (rad)
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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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AerospaceUtils: Coord/ECIToEF AerospaceUtils: Coord/HorizonAngle AerospaceUtils: Coord/LatLonAltToEF 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 Orbit: OrbitMechanics/Period Orbit: OrbitSim/RVFromKepler Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/TimeLabl Common: Graphics/TitleS Common: Graphics/XLabelS Common: Graphics/YLabelS Common: Time/Date2JD Common: Time/JD2T Math: Linear/Mag
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