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trivial modification

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This commit is contained in:
Chunxiao Li 2021-06-07 12:57:31 +08:00
parent 7bd791a32b
commit f3b4069d54
2 changed files with 17 additions and 12 deletions
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12
pyatmos/standardatmos/coesa76.py
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@ -12,6 +12,8 @@ from .ussa76 import ussa76
from ..utils import Const
from ..utils.utils import alt_conver,check_altitude
from ..class_atmos import ATMOS
def coesa76(alts, alt_type='geometric'):
'''
Implements the U.S. Committee on Extension to the Standard Atmosphere(COESA 1976).
@ -27,7 +29,7 @@ def coesa76(alts, alt_type='geometric'):
Ts -> [float] temperatures ..., [K]
Ps -> [float] pressures ..., [Pa]
Note: the geometric altitudes should be in [-0.610,1000] km, otherwise the output will be extrapolated for those input altitudes.
Note: the geometric altitudes should be in [-0.611,1000] km, otherwise the output will be extrapolated for those input altitudes.
Reference:
U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C.
@ -43,7 +45,7 @@ def coesa76(alts, alt_type='geometric'):
data = np.load(data_path+'coesa76_coeffs.npz')
rho_coeffs,p_coeffs = data['rho'],data['p']
r0 = Const.r0 # volumetric radius for the Earth, [km]
R0 = Const.R0 # volumetric radius for the Earth, [km]
# Get geometric and geopotential altitudes
zs,hs = alt_conver(alts, alt_type)
@ -67,7 +69,7 @@ def coesa76(alts, alt_type='geometric'):
elif z > zb[3] and z <= zb[4]:
T = 240 + 12 * (z - 110)
else:
epsilon = (z - 120) * (r0 + 120) / (r0 + z)
epsilon = (z - 120) * (R0 + 120) / (R0 + z)
T = 1e3 - 640 * np.exp(-0.01875 * epsilon)
ind = np.where((z - zb) >= 0)[0][-1]
@ -82,4 +84,6 @@ def coesa76(alts, alt_type='geometric'):
rhos[j],Ts[j],Ps[j] = rho,T,P
j += 1
return rhos,Ts,Ps
info = {'rho':rhos,'T':Ts,'P':Ps}
return ATMOS(info)

15
pyatmos/standardatmos/expo.py
View File

@ -1,16 +1,15 @@
import numpy as np
from ..utils.utils import alt_conver,check_altitude
from ..class_atmos import ATMOS
def expo(alts,alt_type='geometric'):
'''
Estimate the air densities at given geometric or geopotential altitudes
above the sea level using a exponential atmosphere model from
Vallado, D. A. (2013). Fundamentals of astrodynamics and applications (4th Edition). Microcosm Press.
Estimate the mass densities at given geometric or geopotential altitudes
above the sea level using a exponential atmosphere model.
Usage:
rhos = expo(alts)
or
rhos = expo(alts,'geopotential')
Inputs:
@ -23,7 +22,7 @@ def expo(alts,alt_type='geometric'):
rhos -> [float array] densities at given altitudes, [kg/m^3]
Reference:
Vallado, D. A. (2013). Fundamentals of astrodynamics and applications (4th Edition). Microcosm Press.
'''
# Get geometric and geopotential altitudes
@ -59,4 +58,6 @@ def expo(alts,alt_type='geometric'):
inds[i] = np.where((zs[i] - zb_expand) >= 0)[0][-1]
rhos = rhob[inds]*np.exp(-(zs-zb[inds])/ZS[inds])
return rhos
info = {'rho':rhos}
return ATMOS(info)