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The invention provides a software tool in a PC environment, which can be used for planing and analyzing a mission of communication satellite. Input data required for predicting and estimating the amount of fuel remaining in the satellite is automatically connected to the main program, to create the

The invention provides a software tool in a PC environment, which can be used for planing and analyzing a mission of communication satellite. Input data required for predicting and estimating the amount of fuel remaining in the satellite is automatically connected to the main program, to create the remaining fuel quantity value in the result file automatically. The invention allows the satellite operator to easily perform the computation of the remaining fuel quantity in the analysis of satellite mission, and to arrange related data.

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[ What is claimed is:] [1.] An apparatus for estimating amount of fuel remaining in a GEO (Geostationary Earth Orbit) communication satellite propulsion system, the apparatus comprising:a standard setting block for setting standard data required for a propulsion system of a communication satellite;a

[ What is claimed is:] [1.] An apparatus for estimating amount of fuel remaining in a GEO (Geostationary Earth Orbit) communication satellite propulsion system, the apparatus comprising:a standard setting block for setting standard data required for a propulsion system of a communication satellite;a mission analysis block for providing satellite velocity value in accordance with periodical position control in horizontal and vertical directions with regard to sun and moon ophemer is, based upon the standard required for the communication satellite propulsion system, the amount of the fuel consumed and amount of remaining fuel;an apogee kick motor-related data storage block for proving data associated with apogee kick motor, and weight of apogee kick motor;a structure block for providing the weight of apogee kick motor and weight of load among weight of satellite structure, based on the standard required for the communication satellite propulsion system and the data supplied from data storage block, the satellite structure weight being required for initial computation;a thruster-related data storage block for storing thruster-related data;a propulsion block for determining initial amount of fuel loaded in the satellite structure, and weight of compressed gas used to oxidize and jet the fuel, based on the standard required for the communication satellite propulsion system, the thruster-related data, the amount of fuel consumed, and the amount of the remaining fuel;an orbit and altitude control block for determining an operation plan required for performing a mission of the satellite, through a variety of analysis procedures, based upon the standard required for the communication satellite propulsion system; anda remaining fuel quantity estimation block for sending the amount of fuel consumed and the amount of fuel remaining in a storage tank to the mission analysis block and structure block, the amount of fuel consumed and the amount of the remaining fuel being calculated using the satellite velocity variation value supplied from the mission analysis block, the weight of the satellite structure supplied from the structure block, pressure data, and the compressed gas' weight supplied from the propulsion block, and data about the operation plan being determined by the orbit and altitude control block, the remaining fuel quantity estimation block being for performing the aforementioned procedure at every satellite operation, to compute and estimate the amount of the remaining fuel.