def channel_init(self):
self.rx_interconnect = pylink.Interconnect(is_rx=True)
self.tx_interconnect = pylink.Interconnect(is_rx=False)
altitude = self.sampler(self.channel_configuration,
['geometry', 'altitude'])
self.geometry = pylink.Geometry(apoapsis_altitude_km=altitude,
periapsis_altitude_km=altitude,
min_elevation_deg=self.elevation)
self.downlink_channel = pylink.Channel(
bitrate_hz=self.sampler(self.channel_configuration,
['downlink', 'bitrate']),
allocation_hz=self.sampler(self.channel_configuration,
['downlink', 'allocation']),
center_freq_mhz=self.sampler(self.channel_configuration,
['downlink', 'center_freq']),
atmospheric_loss_db=self.sampler(self.channel_configuration,
['downlink', 'atmospheric_loss']),
ionospheric_loss_db=self.sampler(self.channel_configuration,
['downlink', 'ionospheric_loss']),
rain_loss_db=self.sampler(self.channel_configuration,
['downlink', 'rain_loss']),
multipath_fading_db=self.sampler(self.channel_configuration,
['downlink', 'multipath_fading']),
polarization_mismatch_loss_db=self.sampler(
self.channel_configuration,
['downlink', 'polarization_mismatch_loss']))
self.uplink_channel = pylink.Channel(
bitrate_hz=self.sampler(self.channel_configuration,
['uplink', 'bitrate']),
allocation_hz=self.sampler(self.channel_configuration,
['uplink', 'allocation']),
center_freq_mhz=self.sampler(self.channel_configuration,
['uplink', 'center_freq']),
atmospheric_loss_db=self.sampler(self.channel_configuration,
['uplink', 'atmospheric_loss']),
ionospheric_loss_db=self.sampler(self.channel_configuration,
['uplink', 'ionospheric_loss']),
rain_loss_db=self.sampler(self.channel_configuration,
['uplink', 'rain_loss']),
multipath_fading_db=self.sampler(self.channel_configuration,
['uplink', 'multipath_fading']),
polarization_mismatch_loss_db=self.sampler(
self.channel_configuration,
['uplink', 'polarization_mismatch_loss']))
def model():
return pylink.DAGModel([pylink.Geometry(),
pylink.Antenna(is_rx=True),
pylink.Interconnect(is_rx=True),
pylink.Receiver(),
pylink.Transmitter(),
pylink.Interconnect(is_rx=False),
pylink.Antenna(is_rx=False),
pylink.Channel(),
pylink.Modulation(name='QPSK', perf=perf),
pylink.LinkBudget()])
name='Ground SBand Receiver')
gs_transmitter = pylink.Transmitter(tx_power_at_pa_dbw=23,
name='Ground SBand Transmitter')
sat_transmitter = pylink.Transmitter(tx_power_at_pa_dbw=1.5,
name='Satellite XBand Transmitter')
rx_interconnect = pylink.Interconnect(is_rx=True)
tx_interconnect = pylink.Interconnect(is_rx=False)
x_channel = pylink.Channel(bitrate_hz=1e6,
allocation_hz=500e4,
center_freq_mhz=8200,
atmospheric_loss_db=1,
ionospheric_loss_db=1,
rain_loss_db=2,
multipath_fading_db=0,
polarization_mismatch_loss_db=3)
s_channel = pylink.Channel(bitrate_hz=500e3,
allocation_hz=5e6,
center_freq_mhz=2022.5,
atmospheric_loss_db=.5,
ionospheric_loss_db=.5,
rain_loss_db=1,
multipath_fading_db=0,
polarization_mismatch_loss_db=3)
# defaults to DVB-S2X
modulation = pylink.Modulation()
"""Illustrations of the precedence order for node definitions.
Nodes are added to the DAG in the order in which they are received.
So you can, if you wish, override a standard definition.
"""
# Vanilla link budget
m = pylink.DAGModel([
pylink.Geometry(),
pylink.Transmitter(tx_power_at_pa_dbw=2),
pylink.Interconnect(is_rx=False),
pylink.Antenna(is_rx=False),
pylink.Receiver(),
pylink.Antenna(is_rx=True),
pylink.Interconnect(is_rx=True),
pylink.Channel(),
pylink.Modulation('DVB-S2X'),
pylink.LinkBudget()
])
e = m.enum
print 'Link margin in vanilla example: %s' % m.link_margin_db
# let's override the link_margin_db node in the kwargs
def _evil_margin_db(model):
return -3.0
m = pylink.DAGModel([
pylink.Geometry(),
gs_transmitter = pylink.Transmitter(tx_power_at_pa_dbw=25,
name='Ground Ka-Band Transmitter')
sat_transmitter = pylink.Transmitter(tx_power_at_pa_dbw=50,
name='Satellite Ka-Band Transmitter')
rx_interconnect = pylink.Interconnect(is_rx=True)
tx_interconnect = pylink.Interconnect(is_rx=False)
ka_channel = pylink.Channel(bitrate_hz=.072,
allocation_hz=500e6,
center_freq_mhz=32550,
atmospheric_loss_db=1,
ionospheric_loss_db=1,
rain_loss_db=2,
multipath_fading_db=0,
polarization_mismatch_loss_db=3)
modulation = pylink.Modulation()
DOWNLINK = pylink.DAGModel([geometry,
gs_rx_antenna,
sat_transmitter,
sat_tx_antenna,
gs_receiver,
ka_channel,
rx_interconnect,
tx_interconnect,
