orbital characteristics of megha-tropiques t.ravindra babu m.s.jayashree g.raju isro satellite...
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Orbital Characteristics of Megha-Tropiques
T.Ravindra BabuM.S.Jayashree
G.Raju
ISRO Satellite CentreBangalore
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Payloads
Microwave Analysis and Detection of Rain and Atmospheric Structures (MADRAS)
A microwave instrument for retrieval of water vapour vertical profiles (SAPHIR)
A radiometer devoted to the measurement of Outgoing radiative fluxes at the top of atmosphere (SCARAB)
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Keplerian Elements
X,Y,Z – Earth Centred Inertial Coordinate System N – Ascending node, point of intersection between Equatorial and orbital planes, when spacecraft is North bound P – Perigee point S – Spacecraft i - inclination of orbit - Right Ascension of Ascending node - Argument of perigee - True anomaly, related to Eccentric Anomaly (E). E and Mean anomaly(M) are related through Kepler’s equation
i
P
N XY
Z
S
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Repeat Cycle
Non-sun synchronous orbit
Ground track repetitivity
Prograde orbit (inclination, i < 90)
Repeat cycle as function of nodal days
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Repeat Cycle – options
Altitude ProfileOrbit options for 7-day cycle
500600700800900
1000110012001300
88 93 98 103
No. of orbits in 7-day cycle
Orb
it A
ltit
ud
e (k
m)
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Repeat Cycle - options
Revolutions per dayOrbit options for 7-day cycle
12.5
13
13.5
14
14.5
15
15.5
88 90 92 94 96 98 100 102 104
No. of revoultions in 7-day cyle
No
. o
f re
volu
tio
ns
per
day
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Repeat Cycle – Chosen orbit
No. of nodal days in the cycle : 7
No. of revolutions per cycle : 97
Nodal period of the orbit : 6116.4 sec
No. of revolutions per day : 14.13
Rate of Right Ascension of node : - 6.01 deg/day
Apsidal rotation rate (frozen perigee): 0 deg/day
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Sun-aspect Angle
vXrh
r v
xY
Z
Sun-aspect angle
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Sun AnglesSun Aspect Angle variation
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Sun Angles
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Radio visibilities in one cycle
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Ground Trace
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Frozen orbit analysis
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Eclipse Duration
Eclipse Duration for one cycle of sun aspect angle
282930313233343536
0 100 200 300 400 500 600 700 800
Revolution Number
Ecl
ipse
du
rati
on
(m
in)
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Local Time
Descending Node local time of 12:00
N
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Local Time change
Local time variation at equator in one cycle of sun-aspect angle
0
6
12
18
24
0 100 200 300 400 500 600 700 800
Revolution number
Lo
cal
tim
e (h
ou
rs)
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Ground Track Velocity
Ground Track Velocity
6.096.095
6.16.1056.11
6.1156.12
6.1256.13
0 1000 2000 3000 4000 5000 6000 7000
Time since asc node crossing(sec)
Gro
un
d T
rack
ve
loci
ty(k
m/s
ec)
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Ground track azimuth
Heading angle
60
70
80
90
100
110
120
2400 3400 4400 5400 6400 7400 8400 9400 10400
Time in sec since nearest eq. crossing
Hea
din
g a
ng
le (
deg
)
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Earth coverage