def test_tx_inline_losses_db(self, model):
e = model.enum
m = model
radio_chain = [pylink.Element(name='x', gain_db=-1, noise_figure_db=1)]
inter_chain = [pylink.Element(name='x', gain_db=-1, noise_figure_db=1)]
ant_chain = [pylink.Element(name='x', gain_db=-1, noise_figure_db=1)]
m.override(e.transmitter_rf_chain, radio_chain)
m.override(e.tx_interconnect_rf_chain, inter_chain)
m.override(e.tx_antenna_rf_chain, ant_chain)
assert abs(m.tx_inline_losses_db - 3) < 1e-5
def test_rx_rf_chain(self, model):
e = model.enum
m = model
radio_chain = [pylink.Element(name='a', gain_db=-1, noise_figure_db=1)]
inter_chain = [pylink.Element(name='b', gain_db=-2, noise_figure_db=2)]
ant_chain = [pylink.Element(name='c', gain_db=-3, noise_figure_db=3)]
m.override(e.receiver_rf_chain, radio_chain)
m.override(e.rx_interconnect_rf_chain, inter_chain)
m.override(e.rx_antenna_rf_chain, ant_chain)
chain = ant_chain + inter_chain + radio_chain
assert m.rx_rf_chain == chain
#!/usr/bin/env python
import os
import shutil
import subprocess
import numpy as np
import matplotlib.pyplot as plt
import pylink
sat_pattern = pylink.pattern_generator(3)
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,
def satellite_init(self):
# build the receive RF chain
self.sat_rf_chain = [
pylink.Element(name='Cables',
gain_db=self.sampler(self.satellite_configuration,
['rx', 'cable', 'gain']),
noise_figure_db=self.sampler(
self.satellite_configuration,
['rx', 'cable', 'noise_figure'])),
pylink.Element(name='LNA',
gain_db=self.sampler(self.satellite_configuration,
['rx', 'lna', 'gain']),
noise_figure_db=self.sampler(
self.satellite_configuration,
['rx', 'lna', 'noise_figure'])),
pylink.Element(name='Filter',
gain_db=self.sampler(self.satellite_configuration,
['rx', 'filter', 'gain']),
noise_figure_db=self.sampler(
self.satellite_configuration,
['rx', 'filter', 'noise_figure'])),
pylink.Element(name='Demodulator',
gain_db=self.sampler(self.satellite_configuration,
['rx', 'demodulator', 'gain']),
noise_figure_db=self.sampler(
self.satellite_configuration,
['rx', 'demodulator', 'noise_figure'])),
]
# if no gain given, calculate from the antenna aperture
if 'gain' in self.satellite_configuration['nominal']['rx']['antenna']:
sat_rx_antenna_gain = self.sampler(self.satellite_configuration,
['rx', 'antenna', 'gain'])
if 'aperture' in self.satellite_configuration['nominal']['rx'][
'antenna'] and self.warn:
print(
"Satellite Rx Antenna: Both gain and aperature provided, will use gain"
)
else:
sat_rx_antenna_gain = 10 * np.log10(
self.sampler(self.satellite_configuration,
['rx', 'antenna', 'aperture_efficiency']) *
self.sampler(self.satellite_configuration,
['rx', 'antenna', 'aperture']) * 4 * np.pi *
(1e6 * self.sampler(self.channel_configuration,
['uplink', 'center_freq']))**2 /
scipy.constants.c**2)
# specify the receive antenna
self.sat_rx_antenna = pylink.Antenna(
gain=sat_rx_antenna_gain,
polarization=self.satellite_configuration['nominal']['rx']
['antenna']['polarization'],
pattern=self.sampler(self.satellite_configuration,
['rx', 'antenna', 'pattern']),
is_rx=True,
tracking=self.satellite_configuration['nominal']['rx']['antenna']
['tracking'],
pointing_loss_db=self.sampler(self.satellite_configuration,
['rx', 'antenna', 'pointing_loss']),
rx_noise_temp_k=self.sampler(self.satellite_configuration,
['rx', 'antenna', 'noise_temp']))
# if no gain given, calculate from the antenna aperture
if 'gain' in self.satellite_configuration['nominal']['tx']['antenna']:
sat_tx_antenna_gain = self.sampler(self.satellite_configuration,
['tx', 'antenna', 'gain'])
if 'aperture' in self.satellite_configuration['nominal']['tx'][
'antenna'] and self.warn:
print(
"Satellite Tx Antenna: Both gain and aperature provided, will use gain"
)
else:
sat_tx_antenna_gain = 10 * np.log10(
self.sampler(self.satellite_configuration,
['tx', 'antenna', 'aperture_efficiency']) *
self.sampler(self.satellite_configuration,
['tx', 'antenna', 'aperture']) * 4 * np.pi *
(1e6 * self.sampler(self.channel_configuration,
['downlink', 'center_freq']))**2 /
scipy.constants.c**2)
self.sat_tx_antenna = pylink.Antenna(
gain=sat_tx_antenna_gain,
polarization=self.satellite_configuration['nominal']['tx']
['antenna']['polarization'],
pattern=self.sampler(self.satellite_configuration,
['tx', 'antenna', 'pattern']),
is_rx=False,
tracking=self.satellite_configuration['nominal']['tx']['antenna']
['tracking'],
pointing_loss_db=self.sampler(self.satellite_configuration,
['rx', 'antenna', 'pointing_loss']))
self.sat_receiver = pylink.Receiver(
rf_chain=self.sat_rf_chain,
implementation_loss_db=self.sampler(
self.satellite_configuration,
['rx', 'receiver', 'implementation_loss']),
name='Satellite ' +
self.channel_configuration['nominal']['uplink']['name'] +
' Receiver')
self.sat_transmitter = pylink.Transmitter(
tx_power_at_pa_dbw=self.sampler(self.satellite_configuration,
['tx', 'pa', 'power']),
name='Satellite ' +
self.channel_configuration['nominal']['downlink']['name'] +
' Transmitter')
def example_rf_chain():
return [
pylink.Element(gain_db=-0.1,
noise_figure_db=0.1,
name='attenuator')
]
def amplifier_10db():
return pylink.Element(gain_db=10,
noise_figure_db=3,
name='amplifier')
def attenuator_1db():
return pylink.Element(gain_db=-1,
noise_figure_db=1,
name='attenuator')