TNAG-2109-FCO40-3008-Outer-Space-Act-1986-extension-to-Hong-Kong-1990 — Page 119

orbit transfer

to

Propulsion calibration software shall be compatible with

software in order the corresponding ensure a smooth and accurate transition between transfer orbit, drift orbit, and on-station operation.

6.1.5 Eclipse Prediction

The Eclipse

the

Prediction software

shall be

It

of

as seen

shall

capable predicting all earth and moon eclipses of the sun as

it's satellite during

entire life. by describe each eclipse in terms of entry and exit of both the penumbra and umbra, and shall specify the maximum obscuration of the sun.

6.1.6 Satellite Position Prediction

The

generation ephemerides. of prediction:

prediction general

software shall

capable of As a minimum, it should be capable

be

i)

orbital elements and attitude vectors;

ii)

satellite latitude and longitude;

iii)

antenna pointing angles ground system.

for any antennas in the

6.1.7 Propagation of Orbit and Attitude

The method for propagating the orbital elements and the attitude shall be

to common

both the estimation and prediction software. It must include all normal geostationary pertubations sufficient to satisfy required stationkeeping accuracy and consistent with minimizing fuel usage over the life of the satellite.

6.2 System Design Requirements

6.2.1 Operating Staff

the

The software shall be designed in such a way as to require (2) trained analysts to control the

no more

than two

dynamics of the satellite.

6.2.2 Language

be

All elements of the stationkeeping subsystem shall written in a current computer-manufacturer supported version of a high level language (e.g. FORTRAN IV, ALGOL, PASCAL), in a well-structured, modular fashion. Sufficient

shall be included comments

in in the source to make the individual programs self-documenting. The documented source code shall be delivered if permitted.

6.2.3 Coordinate Systems

14 ·