:
The stationkeeping software/hardware shall be capable of maintaining one (1) satellite within +/-0.05° in latitude and longitude of the assigned orbit position with minimum fuel usage.
As a minimum, the Contractor shall provide software
outlined tasks the perform
following specific remainder of this section.
to
in the
6.1.1 Orbit Estimation
The
software shall be
capable
of
Orbit Estimation processing up to seven (7) days of tracking data (azimuth, elevation and slant range) at the rate of twenty-four (24) from the SCF sets of pre-smoothed observations per day, TT&C antenna. The software shall retrieve the observations from the data storage system and provide a choice of either automatic or interactive culling of bad observations.
6.1.2 Attitude Estimation
For a spacecraft which requires attitude control from the ground, the Attitude Estimation software shall be capable
sets to three hundred fifty (350) of processing up attitude
measurements sensor
taken over a three-day
interval.
of
The software shall retrieve the observations from the data storage system and shall provide a choice of automatic of interactive culling of bad observations.
All measurement biases estimation shall be estimated.
necessary for accurate
attitude
6.1.3 Stationkeeping Manoeuvre Planning
manoeuvres
which
in
a
The Stationkeeping Manoeuvre Planning software
software shall be capable of calculating velocity adjustments to control the orbit inclination, longitude (drift and eccentricity) and attitude
satisfy the overall stationkeeping requirements The software shall utilize actual thruster geometries, current spacecraft mass properties and current thruster performance models to convert
of velocity requirements into satellite commands.
fuel-efficient
manner.
procession
6.1.4 Propulsion System Modeling
Provision shall be made to update the Propulsion System The model Model from the performance of past manoeuvres. shall be capable of monitoring thruster efficiencies and fuel usage. It shall also be capable of predicting when the propulsion
exhausted, based on extrapolated performance and expected velocity require-
ments.
fuel will be
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