def clock_corrections(self, t):
corr = np.zeros(t.shape) * u.s
if self.include_gps:
log.info("Applying GPS to UTC clock correction (~few nanoseconds)")
if self._gps_clock is None:
log.info("Observatory {0}, loading GPS clock file {1}".format(
self.name, self.gps_fullpath))
self._gps_clock = ClockFile.read(self.gps_fullpath,
format="tempo2")
corr += self._gps_clock.evaluate(t)
if self.include_bipm:
log.info("Applying TT(TAI) to TT(BIPM) clock correction (~27 us)")
tt2tai = 32.184 * 1e6 * u.us
if self._bipm_clock is None:
try:
log.info(
"Observatory {0}, loading BIPM clock file {1}".format(
self.name, self.bipm_fullpath))
self._bipm_clock = ClockFile.read(self.bipm_fullpath,
format="tempo2")
except:
raise ValueError("Can not find TT BIPM file '%s'. " %
self.bipm_version)
corr += self._bipm_clock.evaluate(t) - tt2tai
return corr
def clock_corrections(self, t):
"""Compute the total clock corrections,
Parameters
----------
t : astropy.time.Time
The time when the clock correcions are applied.
"""
# Read clock file if necessary
# TODO provide some method for re-reading the clock file?
if self._clock is None:
clock_files = (self.clock_fullpath if self._multiple_clock_files
else [self.clock_fullpath])
self._clock = []
for clock_file in clock_files:
log.info("Observatory {0}, loading clock file \n\t{1}".format(
self.name, clock_file))
self._clock.append(
ClockFile.read(clock_file,
format=self.clock_fmt,
obscode=self.tempo_code))
log.info("Applying observatory clock corrections.")
corr = self._clock[0].evaluate(t)
for clock in self._clock[1:]:
corr += clock.evaluate(t)
if self.include_gps:
log.info("Applying GPS to UTC clock correction (~few nanoseconds)")
if self._gps_clock is None:
log.info(
"Observatory {0}, loading GPS clock file \n\t{1}".format(
self.name, self.gps_fullpath))
self._gps_clock = ClockFile.read(self.gps_fullpath,
format="tempo2")
corr += self._gps_clock.evaluate(t)
if self.include_bipm:
log.info(
f"Applying TT(TAI) to TT({self.bipm_version}) clock correction (~27 us)"
)
tt2tai = 32.184 * 1e6 * u.us
if self._bipm_clock is None:
try:
log.info(
"Observatory {0}, loading BIPM clock file \n\t{1}".
format(self.name, self.bipm_fullpath))
self._bipm_clock = ClockFile.read(self.bipm_fullpath,
format="tempo2")
except Exception as e:
raise ValueError(
f"Can not find TT BIPM file for version '{self.bipm_version}'."
) from e
corr += self._bipm_clock.evaluate(t) - tt2tai
return corr
def test_wsrt(self):
# Issue here is the wsrt clock file has text columns, which used to cause np.loadtxt to crash
cf = ClockFile.read(
path.join(datadir, "wsrt2gps.clk"), format="tempo2", obscode="i"
)
t = Time(57109.5, scale="utc", format="mjd")
e = cf.evaluate(t)
assert numpy.isclose(e.to(u.us).value, 7.907)
def test_Parkes(self):
obs = Observatory.get('Parkes')
cf = ClockFile.read(obs.clock_fullpath, format=obs.clock_fmt,
obscode=obs.tempo_code)
mjd = cf.time.mjd
corr = cf.clock.to(u.us).value
assert numpy.isclose(mjd.min(), 44000.0)
idx = numpy.where(numpy.isclose(mjd,49990.0))[0][0]
assert numpy.isclose(corr[idx],-2.506)
idx = numpy.where(numpy.isclose(mjd,55418.27))[0][0]
assert numpy.isclose(corr[idx],-0.586)
def test_Parkes(self):
obs = Observatory.get('Parkes')
cf = ClockFile.read(obs.clock_fullpath, format=obs.clock_fmt,
obscode=obs.tempo_code)
mjd = cf.time.mjd
corr = cf.clock.to(u.us).value
assert numpy.isclose(mjd.min(), 44000.0)
idx = numpy.where(numpy.isclose(mjd,49990.0))[0][0]
assert numpy.isclose(corr[idx],-2.506)
idx = numpy.where(numpy.isclose(mjd,55418.27))[0][0]
assert numpy.isclose(corr[idx],-0.586)
def test_parkes(self):
obs = Observatory.get("Parkes")
if os.getenv("TEMPO2") is None:
pytest.skip(
"TEMPO2 evnironment variable is not set, can't run this test")
cf = ClockFile.read(obs.clock_fullpath,
format=obs.clock_fmt,
obscode=obs.tempo_code)
t = Time(51211.73, format="pulsar_mjd", scale="utc")
assert numpy.isclose(cf.evaluate(t), 1.75358956 * u.us)
t = Time(55418.11285, format="pulsar_mjd", scale="utc")
assert numpy.isclose(cf.evaluate(t), -0.593622 * u.us)
def test_wsrt(self):
# Issue here is the wsrt clock file has text columns, which used to cause np.loadtxt to crash
cf = ClockFile.read(
path.join(datadir, "wsrt2gps.clk"), format="tempo2", obscode="i"
)
t = Time(57109.5, scale="utc", format="mjd")
e = cf.evaluate(t)
assert numpy.isclose(e.to(u.us).value, 7.907)
# Test that an error is raised when time is outside of clock file range.
# Normally it just prints a warning, but I'm not sure how to test for that, so I set limits="error"
with pytest.raises(RuntimeError):
t = cf.time[-1] + 1.0 * u.d
cf.evaluate(t, limits="error")
def test_parkes(self):
obs = Observatory.get("Parkes")
if os.getenv("TEMPO2") is None:
pytest.skip("TEMPO2 environment variable is not set, can't run this test")
cf = ClockFile.read(
obs.clock_fullpath, format=obs.clock_fmt, obscode=obs.tempo_code
)
t = Time(51211.73, format="pulsar_mjd", scale="utc")
assert numpy.isclose(cf.evaluate(t).to(u.us).value, 1.75358956)
t = Time(55418.11285, format="pulsar_mjd", scale="utc")
assert numpy.isclose(cf.evaluate(t).to(u.us).value, -0.593622)
# Test that an error is raised when time is outside of clock file range.
# Normally it just prints a warning, but I'm not sure how to test for that, so I set limits="error"
with pytest.raises(RuntimeError):
t = cf.time[-1] + 1.0 * u.d
cf.evaluate(t, limits="error")