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add TaiJi psd support #113

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add TaiJi psd support #113

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10 changes: 10 additions & 0 deletions legwork/psd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -191,6 +191,13 @@ def tianqin_psd(f, L=np.sqrt(3) * 1e5 * u.km, t_obs=5 * u.yr, approximate_R=None

return psd.to(u.Hz**(-1))

def taiji_psd(f, L, t_obs, approximate_R, confusion_noise):
fstar = const.c / (2 * np.pi * L)
Sa = 9e-30 * u.m**2 * u.s**(-4) * u.Hz**(-1)
Sx = 64e-24 * u.m**2 * u.Hz**(-1)
psd = 10 / (3 * L**2) * (4 * Sa / (2 * np.pi * f)**4 * (1 + (4e-4 * u.Hz / f)) + Sx) \
* (1 + 0.6 * (f / fstar)**2)
return psd.to(u.Hz**(-1))

def power_spectral_density(f, instrument="LISA", custom_psd=None, t_obs="auto", L="auto",
approximate_R=False, confusion_noise="auto"):
Expand Down Expand Up @@ -245,6 +252,9 @@ def power_spectral_density(f, instrument="LISA", custom_psd=None, t_obs="auto",

# calculate psd
psd = tianqin_psd(f=f, L=L, t_obs=t_obs, approximate_R=approximate_R, confusion_noise=confusion_noise)
elif instrument == "TaiJi":
L = 3e6 * u.km if L == "auto" else L
psd = taiji_psd(f=f, L=L, t_obs=t_obs, approximate_R=approximate_R, confusion_noise=confusion_noise)
elif instrument == "custom":
psd = custom_psd(f=f, L=L, t_obs=t_obs, approximate_R=approximate_R, confusion_noise=confusion_noise)
else:
Expand Down
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