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Added angle-to-horizon and radio horizon calculations

This commit is contained in:
Mark Qvist 2023-10-25 02:57:28 +02:00
parent ecb5f0c38b
commit 9fe7632e8f
1 changed files with 75 additions and 39 deletions
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98
sbapp/sideband/geo.py
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@ -223,13 +223,49 @@ def orthodromic_distance(c1, c2, ellipsoid=True):
else:
return spherical_distance(c1, c2)
# def tests():
# import RNS
# import numpy as np
# from geographiclib.geodesic import Geodesic
# geod = Geodesic.WGS84
# coords = [
# [(51.2308, 4.38703, 0.0), (47.699437, 9.268651, 0.0)],
def distance_to_horizon(c, ellipsoid=False):
if ellipsoid:
raise NotImplementedError("Distance to horizon on the ellipsoid is not yet implemented")
else:
# TODO: This is a only barely functional simplification.
# Need to calculate the geodesic distance to the horizon
# instead.
if len(c) >= 3:
r = mean_earth_radius
h = c[2]
return sqrt(pow((h+r),2) - r*r)
else:
return None
def angle_to_horizon(c, ellipsoid=False):
if ellipsoid:
raise NotImplementedError("Angle to horizon on the ellipsoid is not yet implemented")
else:
r = mean_earth_radius
h = c[2]
return degrees(-acos(r/(r+h)))
def radio_horizon(c1, c2, ellipsoid=False):
# dr = 4.12*(√h1 + √h2)
if ellipsoid:
raise NotImplementedError("Radio horizon on the ellipsoid is not yet implemented")
else:
h1 = c1[2]
h2 = c2[2]
ed = euclidian_distance(c1,c2)
rh1 = 1e3*4.12*(sqrt(h1))
rh2 = 1e3*4.12*(sqrt(h2))
rhc = 1e3*4.12*(sqrt(h1) + sqrt(h2))
return (rh1, rh2, rhc, rhc > ed)
def tests():
import RNS
import numpy as np
from geographiclib.geodesic import Geodesic
geod = Geodesic.WGS84
coords = [
[(51.2308, 4.38703, 0.0), (47.699437, 9.268651, 0.0)],
[(51.2308, 4.38703, 0.0), (47.699437, 9.268651, 30.0*1e3)],
# [(51.230800, 4.38703, 0.0), (51.230801, 4.38703, 0.0)],
# [(35.3524, 135.0302, 100), (35.3532,135.0305, 500)],
# [(57.758793, 22.605194, 0.0), (43.048838, -9.241343, 0.0)],
@ -238,27 +274,27 @@ def orthodromic_distance(c1, c2, ellipsoid=True):
# [(-90.0, 0.0, 0.0), (78.0, 0.0, 0.0)],
# [(0.0, 0.0, 0.0), (0.5, 179.5, 0.0)],
# [(0.7, 0.0, 0.0), (0.0, -180.0, 0.0)],
# ]
# for cs in coords:
# c1 = cs[0]; c2 = cs[1]
# print("Testing: "+str(c1)+" -> "+str(c2))
# us = time.time()
# ld = c1+c2; g = geod.Inverse(c1[0], c1[1], c2[0], c2[1])
# print("Lib computed in "+str(round((time.time()-us)*1e6, 3))+"us")
# us = time.time()
# eld = orthodromic_distance(c1,c2,ellipsoid=True)
# if eld:
# print("Own computed in "+str(round((time.time()-us)*1e6, 3))+"us")
# else:
# print("Own timed out in "+str(round((time.time()-us)*1e6, 3))+"us")
# ed_own = euclidian_distance(c1,c2,ellipsoid=True)
# sd_own = orthodromic_distance(c1,c2,ellipsoid=False)
# aa = azalt(c1,c2,ellipsoid=True)
# fac = 1
# if eld: print("LibDiff = "+RNS.prettydistance(g['s12']-eld)+f" {fac*g['s12']-fac*eld}")
# print("Spherical = "+RNS.prettydistance(sd_own)+f" {fac*sd_own}")
# # print("EllipLib = "+RNS.prettydistance(g['s12'])+f" {fac*g['s12']}")
# if eld: print("Ellipsoid = "+RNS.prettydistance(eld)+f" {fac*eld}")
# print("Euclidian = "+RNS.prettydistance(ed_own)+f" {fac*ed_own}")
# print("AzAlt = "+f" {aa[0]} / {aa[1]}")
# print("")
]
for cs in coords:
c1 = cs[0]; c2 = cs[1]
print("Testing: "+str(c1)+" -> "+str(c2))
us = time.time()
ld = c1+c2; g = geod.Inverse(c1[0], c1[1], c2[0], c2[1])
print("Lib computed in "+str(round((time.time()-us)*1e6, 3))+"us")
us = time.time()
eld = orthodromic_distance(c1,c2,ellipsoid=True)
if eld:
print("Own computed in "+str(round((time.time()-us)*1e6, 3))+"us")
else:
print("Own timed out in "+str(round((time.time()-us)*1e6, 3))+"us")
ed_own = euclidian_distance(c1,c2,ellipsoid=True)
sd_own = orthodromic_distance(c1,c2,ellipsoid=False)
aa = azalt(c1,c2,ellipsoid=True)
fac = 1
if eld: print("LibDiff = "+RNS.prettydistance(g['s12']-eld)+f" {fac*g['s12']-fac*eld}")
print("Spherical = "+RNS.prettydistance(sd_own)+f" {fac*sd_own}")
# print("EllipLib = "+RNS.prettydistance(g['s12'])+f" {fac*g['s12']}")
if eld: print("Ellipsoid = "+RNS.prettydistance(eld)+f" {fac*eld}")
print("Euclidian = "+RNS.prettydistance(ed_own)+f" {fac*ed_own}")
print("AzAlt = "+f" {aa[0]} / {aa[1]}")
print("")