Orbital Characteristics of Megha-Tropiques T.Ravindra Babu M.S.Jayashree G.Raju ISRO Satellite Centre Bangalore
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)
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 X Y Z S
Repeat Cycle Non-sun synchronous orbit Ground track repetitivity Prograde orbit (inclination, i < 90 ) Repeat cycle as function of nodal days
Repeat Cycle – options Altitude Profile
Repeat Cycle - options Revolutions per day
Repeat Cycle – Chosen orbit No. of nodal days in the cycle : 7 No. of revolutions per cycle : 97 Nodal period of the orbit : sec No. of revolutions per day : Rate of Right Ascension of node : deg/day Apsidal rotation rate (frozen perigee): 0 deg/day
Sun-aspect Angle x Y Z Sun-aspect angle
Sun Angles Sun Aspect Angle variation
Sun Angles
Radio visibilities in one cycle
Ground Trace
Frozen orbit analysis
Eclipse Duration
Local Time Descending Node local time of 12:00 N
Local Time change
Ground Track Velocity
Ground track azimuth
Earth coverage