def doUpdate(self, sv, parser, namespace, values, option_string):
if isinstance(sv, GPSSatellite):
if sv.l1caEnabled:
signal = signals.GPS.L1CA
elif sv.l2cEnabled:
signal = signals.GPS.L2C
else:
raise ValueError("Signal band must be specified before doppler")
elif isinstance(sv, GLOSatellite):
if sv.isL1Enabled():
frequency_hz = signals.GLONASS.L1S[sv.prn].CENTER_FREQUENCY_HZ
elif sv.isL2Enabled():
frequency_hz = signals.GLONASS.L2S[sv.prn].CENTER_FREQUENCY_HZ
else:
raise ValueError("Signal band must be specified before doppler")
else:
raise ValueError("Signal band must be specified before doppler")
frequency_hz = signal.CENTER_FREQUENCY_HZ
# Select distance: either from a distance parameter or from delays
if namespace.symbol_delay is not None or namespace.chip_delay is not None:
distance = computeDistanceDelay(namespace.symbol_delay,
namespace.chip_delay,
signal)
else:
distance = namespace.distance if namespace.distance is not None else 0.
if namespace.doppler_type == "zero":
doppler = zeroDoppler(distance, namespace.tec, frequency_hz)
elif namespace.doppler_type == "const":
doppler = constDoppler(distance,
namespace.tec,
frequency_hz,
namespace.doppler_value)
elif namespace.doppler_type == "linear":
doppler = linearDoppler(distance,
namespace.tec,
frequency_hz,
namespace.doppler_value,
namespace.doppler_speed)
elif namespace.doppler_type == "sine":
doppler = sineDoppler(distance,
namespace.tec,
frequency_hz,
namespace.doppler_value,
namespace.doppler_amplitude,
namespace.doppler_period)
else:
raise ValueError("Unsupported doppler type")
sv.doppler = doppler
def doUpdate(self, sv, parser, namespace, values, option_string):
if isinstance(sv, GPSSatellite):
if sv.l1caEnabled:
signal = signals.GPS.L1CA
elif sv.l2cEnabled:
signal = signals.GPS.L2C
else:
raise ValueError(
"Signal band must be specified before doppler")
elif isinstance(sv, GLOSatellite):
if sv.isL1Enabled():
frequency_hz = signals.GLONASS.L1S[
sv.prn].CENTER_FREQUENCY_HZ
elif sv.isL2Enabled():
frequency_hz = signals.GLONASS.L2S[
sv.prn].CENTER_FREQUENCY_HZ
else:
raise ValueError(
"Signal band must be specified before doppler")
else:
raise ValueError(
"Signal band must be specified before doppler")
frequency_hz = signal.CENTER_FREQUENCY_HZ
# Select distance: either from a distance parameter or from delays
if namespace.symbol_delay is not None or namespace.chip_delay is not None:
distance = computeDistanceDelay(namespace.symbol_delay,
namespace.chip_delay, signal)
else:
distance = namespace.distance if namespace.distance is not None else 0.
if namespace.doppler_type == "zero":
doppler = zeroDoppler(distance, namespace.tec, frequency_hz)
elif namespace.doppler_type == "const":
doppler = constDoppler(distance, namespace.tec, frequency_hz,
namespace.doppler_value)
elif namespace.doppler_type == "linear":
doppler = linearDoppler(distance, namespace.tec, frequency_hz,
namespace.doppler_value,
namespace.doppler_speed)
elif namespace.doppler_type == "sine":
doppler = sineDoppler(distance, namespace.tec, frequency_hz,
namespace.doppler_value,
namespace.doppler_amplitude,
namespace.doppler_period)
else:
raise ValueError("Unsupported doppler type")
sv.doppler = doppler
def test_DopplerPoly_computeDopplerShiftHz1():
'''
Test phase shift for zero order polynomial doppler
'''
doppler = constDoppler(1000., # Distance
45., # TEC
GPS.L1CA.CENTER_FREQUENCY_HZ, # F
1.) # constant Hz
userTimeAll_s = numpy.asarray([0., 1., 2., 3.])
shift = doppler.computeDopplerShiftHz(userTimeAll_s, GPS.L1CA)
assert abs(1. - shift[0]) < EPSILON
assert abs(1. - shift[1]) < EPSILON
assert abs(1. - shift[2]) < EPSILON
assert abs(1. - shift[3]) < EPSILON
def test_Helper_constDoppler(): ''' Helper method test ''' doppler = constDoppler(1000., 77., 1e9, 100.) assert isinstance(doppler, DopplerPoly) assert isinstance(doppler, DopplerBase) assert doppler.distance0_m == 1000. assert doppler.tec_epm2 == 77. assert len(doppler.distancePoly.coeffs) == 2 assert len(doppler.speedPoly.coeffs) == 1 speed_mps = -scipy.constants.c / 1e7 speedCoeffs = numpy.asarray([speed_mps], dtype=numpy.float) distCoeffs = numpy.asarray([speed_mps, 0.], dtype=numpy.float) assert (numpy.abs(doppler.distancePoly.coeffs - distCoeffs) < EPSILON).all() assert (numpy.abs(doppler.speedPoly.coeffs == speedCoeffs) < EPSILON).all()
def test_DopplerConst_batch():
'''
Verifies execution of the batch computation with const doppler.
'''
doppler = constDoppler(1000., 50., GPS.L1CA.CENTER_FREQUENCY_HZ, 100.)
userTimeAll_s = numpy.linspace(10.,
10. +
NormalRateConfig.SAMPLE_BATCH_SIZE /
NormalRateConfig.SAMPLE_RATE_HZ,
NormalRateConfig.SAMPLE_BATCH_SIZE,
endpoint=False)
amplitude = AmplitudePoly(AmplitudeBase.UNITS_AMPLITUDE, ())
noiseParams = NoiseParameters(GPS.L1CA.CENTER_FREQUENCY_HZ, 0.)
message = Message(1)
code = PrnCode(1)
res = doppler.computeBatch(userTimeAll_s,
amplitude,
noiseParams,
GPS.L1CA,
NormalRateConfig.GPS.L1.INTERMEDIATE_FREQUENCY_HZ,
message,
code,
NormalRateConfig,
True)
signal1, doppler1 = res
doppler.setCodeDopplerIgnored(True)
res = doppler.computeBatch(userTimeAll_s,
amplitude,
noiseParams,
GPS.L1CA,
NormalRateConfig.GPS.L1.INTERMEDIATE_FREQUENCY_HZ,
message,
code,
NormalRateConfig,
True)
signal2, doppler2 = res
assert (doppler1 == doppler2).all()
assert (signal1 != signal2).any()
