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()])
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']))
sat_rf_chain = [
pylink.Element(name='Cables', gain_db=-0.75, noise_figure_db=0.75),
pylink.Element(name='LNA', gain_db=35, noise_figure_db=2.75),
pylink.Element(name='Filter', gain_db=-3.5, noise_figure_db=3.5),
pylink.Element(name='Demodulator', gain_db=0, noise_figure_db=15),
]
gs_rf_chain = [
pylink.Element(name='Cables', gain_db=-0.75, noise_figure_db=0.75),
pylink.Element(name='LNA', gain_db=35, noise_figure_db=2.75),
pylink.Element(name='Filter', gain_db=-3.5, noise_figure_db=3.5),
pylink.Element(name='Demodulator', gain_db=0, noise_figure_db=15),
]
geometry = pylink.Geometry(apoapsis_altitude_km=550,
periapsis_altitude_km=500,
min_elevation_deg=20)
sat_rx_antenna = pylink.Antenna(gain=3,
polarization='RHCP',
pattern=sat_pattern,
rx_noise_temp_k=1000,
is_rx=True,
tracking=False)
sat_tx_antenna = pylink.Antenna(gain=3,
polarization='RHCP',
pattern=sat_pattern,
is_rx=False,
tracking=False)
#!/usr/bin/python
import pylink
"""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
pylink.Element(name='Cables',
gain_db=-0.75,
noise_figure_db=0.75),
pylink.Element(name='LNA',
gain_db=35,
noise_figure_db=2.75),
pylink.Element(name='Filter',
gain_db=-3.5,
noise_figure_db=3.5),
pylink.Element(name='Demodulator',
gain_db=0,
noise_figure_db=15),
]
geometry = pylink.Geometry(apoapsis_altitude_km=426452,
periapsis_altitude_km=356873,
min_elevation_deg=20)
sat_rx_antenna = pylink.Antenna(gain=54.7,
polarization='RHCP',
pattern=sat_pattern,
rx_noise_temp_k=288.84,
is_rx=True,
tracking=False)
sat_tx_antenna = pylink.Antenna(gain=53.11,
polarization='RHCP',
pattern=sat_pattern,
is_rx=False,
tracking=False)
def __do_it_do_it_now(self):
return self.whimsy_coefficient
ex = {
'whimsy_coefficient': TA(42,
datasheet="hitchhiker's guide to the galaxy",
author="Douglas Adams"),
'wacky_computation': __do_it_do_it_now
}
tx_power = TA(2,
part_number='234x',
test_report='http://reports.co/234x')
m = pylink.DAGModel([pylink.Geometry(),
pylink.Transmitter(tx_power_at_pa_dbw=tx_power),
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()],
**ex)
e = m.enum
print('slant range (km): %3g' % m.slant_range_km)
print('antenna angle (deg): %3g' % m.satellite_antenna_angle_deg)
print('total rx noise temp (K): %3g' % m.rx_noise_temp_k)