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feat: change a way to frequency resolution when NFCAL is 2 #71

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feat: change a way to frequency resolution when NFCAL is 2 #71

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20 changes: 16 additions & 4 deletions src/nro45data/psw/ms2/filler/spectral_window.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@ def _get_frequency_spec(hdu: BinTableHDU, row_id: int) -> tuple[np.ndarray, np.n
chwid = data["CHWID"][row_id]
nch = data["NCH"][row_id]
sidbd = data["SIDBD"][row_id]
nfcal = data["NFCAL"][row_id]
fqcal = data["FQCAL"][row_id]
chcal = data["CHCAL"][row_id]

if sidbd == "USB":
net_sideband = 1
Expand All @@ -30,12 +33,21 @@ def _get_frequency_spec(hdu: BinTableHDU, row_id: int) -> tuple[np.ndarray, np.n
else: # DSB
net_sideband = 0

if nfcal == 2:
fmin = fqcal[:nfcal].min()
fmax = fqcal[:nfcal].max()
cmin = chcal[:nfcal].min()
cmax = chcal[:nfcal].max()
df = (fmax - fmin) / (cmax - cmin)
else:
df = chwid

if net_sideband < 0: # LSB
chan_freq = np.array([chwid * ((nch - 1) / 2 - i) + center_freq for i in range(nch)], dtype=float)
chan_width = np.ones(nch, dtype=float) * (-chwid)
chan_freq = np.array([df * ((nch - 1) / 2 - i) + center_freq for i in range(nch)], dtype=float)
chan_width = np.ones(nch, dtype=float) * (-df)
else: # USB or DSB
chan_freq = np.array([chwid * (i - (nch - 1) / 2) + center_freq for i in range(nch)], dtype=float)
chan_width = np.ones(nch, dtype=float) * chwid
chan_freq = np.array([df * (i - (nch - 1) / 2) + center_freq for i in range(nch)], dtype=float)
chan_width = np.ones(nch, dtype=float) * df

return chan_freq, chan_width, net_sideband

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