Array¶
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class
ehtim.array.Array(tarr, ephem={})[source]¶ A VLBI array of telescopes with site locations, SEFDs, and other data.
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tarr¶ The array of telescope data with datatype DTARR
- Type
numpy.recarray
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ephem¶ A dictionary of TLEs for each space antenna, Space antennas have x=y=z=0 in the tarr
- Type
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add_satellite_elements(satname, perigee_mjd=60419.930504360615, period_days=1.0, eccentricity=0.0, inclination=0.0, arg_perigee=0.0, long_ascending=0.0, sefd=10000)[source]¶ Add an earth-orbiting satellite to the array from simple keplerian elements perfect keplerian orbit is assumed, no derivatives
- Parameters
time given in mjd (perigee) –
given in days (period) –
arg_perigee, long_ascending given in degrees (inclination,) –
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add_satellite_tle(tlelist, sefd=10000)[source]¶ Add an earth-orbiting satellite to the array from a TLE
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add_site(site, coords, sefd=10000, fr_par=0, fr_elev=0, fr_off=0, dr=0j, dl=0j)[source]¶ Add a ground station to the array
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copy()[source]¶ Copy the array object.
Args:
- Returns
a copy of the Array object.
- Return type
(Array)
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make_subarray(sites)[source]¶ Make a subarray from the Array object array that only includes the sites listed.
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obsdata(ra, dec, rf, bw, tint, tadv, tstart, tstop, mjd=51544, timetype='UTC', polrep='stokes', elevmin=10.0, elevmax=85.0, no_elevcut_space=False, tau=0.1, fix_theta_GMST=False)[source]¶ Generate u,v points and baseline uncertainties.
- Parameters
ra (float) – the source right ascension in fractional hours
dec (float) – the source declination in fractional degrees
tint (float) – the scan integration time in seconds
tadv (float) – the uniform cadence between scans in seconds
tstart (float) – the start time of the observation in hours
tstop (float) – the end time of the observation in hours
mjd (int) – the mjd of the observation
timetype (str) – how to interpret tstart and tstop; either ‘GMST’ or ‘UTC’
polrep (str) – polarization representation, either ‘stokes’ or ‘circ’
elevmin (float) – station minimum elevation in degrees
elevmax (float) – station maximum elevation in degrees
no_elevcut_space (bool) – if True, do not apply elevation cut to orbiters
tau (float) – the base opacity at all sites, or a dict giving one opacity per site
fix_theta_GMST (bool) – if True, stops earth rotation to sample fixed u,v points
- Returns
an observation object with no data
- Return type
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plot_dterms(sites='all', label=None, legend=True, clist=[0.11764705882352941, 0.5647058823529412, 1.0, 1.0, 0.38823529411764707, 0.2784313725490196, 0.5411764705882353, 0.16862745098039217, 0.8862745098039215, 0.4196078431372549, 0.5568627450980392, 0.13725490196078433, 1.0, 0.6470588235294118, 0.0, 0.5450980392156862, 0.27058823529411763, 0.07450980392156863, 0.0, 0.0, 0.803921568627451, 1.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 0.39215686274509803, 0.0, 0.8235294117647058, 0.7058823529411765, 0.5490196078431373, 0.0, 0.0, 0.0], rangex=False, rangey=False, markersize=6, show=True, grid=True, export_pdf='')[source]¶ Make a plot of the D-terms.
- Parameters
sites (list) – list of sites to plot
label (str) – title for plot
legend (bool) – add telescope legend or not
clist (list) – list of colors for different stations
rangex (list) – lower and upper x-axis limits
rangey (list) – lower and upper y-axis limits
markersize (float) – marker size
show (bool) – display the plot or not
grid (bool) – add a grid to the plot or not
export_pdf (str) – save a pdf file to this path
- Returns
matplotlib.axes
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