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Automatic control in space 1982 : proceedings of the ninth by P Th L M van Woerkom; IFAC Technical Committee on

By P Th L M van Woerkom; IFAC Technical Committee on Space.; European Space Research and Technology Centre. Powers and Controls Division

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Fig . 4 . ,, "" .. , �-- '• -· - L£ID(I ·- x ·- y ·- z ' ,.. - ""'··-...... \ "" '. Olll'e l t i-m ! QI "" Exampl e of Relat ive Magn i t ude o f Aerodynamic and G ravity Gradient Torque - Space P l a t form A t t i tude Control Sy s t em conf igurations . Beta angles ( angle between sunline and the orbit plan e ) of 0 , 4 0 , and torquer bars would be required f o r perfect momentum management ( i . e . , no net momentum bui l d up after any one orbi t ) . 80 degrees was considered.

C G R UA LA F IG URE 3 T H R USTER L AY O U T I ELEC TRONICS ( DH S I S ) AOCE I - S O F T WA R E I I INCLUDES : - REAL MTOS TIME - T M I TC P R O C ESSING - SPIN R A T E I C A L C ULATION ' - C OM M A N D E D I C O N TROL F C T I I I I - AUTOMATIC C O N T R OL F C T V'I JiiDM1 ! _l a.. 1 SPI N R E F SPIN S E G P4LS E INERT R E F G E N E R A T OR : RAM ,_j Ll_C24_4j I J INIOiJ T uT ( BU F F E R S 2 L I � . > M TANK THERM P R E SSURE TOX MAINFOLD THERM TCA RCE MONITOR CONNECTOR > rt rt ,...

In any year the atmospheric density varies more than a which considered both 2 0 0 and 2 3 5 nmi altitudes for free f ly and sortie factor of three going from 2 3 5 to 2 0 0 nmi . 0 N M s '·4 V\ ! I / f ! 1 , ·· \ \ I \ � I \ \) ' •• i � : I ' .. II llOlll T l'OSl 111J< IDtll .. •• Y ••Z � \ \ .. I \ .. GRAVITY GRADIENT CYCLIC MOMENTUM 3500 N M S _,I '\. :1, l'OS��lllN ' ...... ' .. ,/ . , ... Fig . 4 . ,, "" .. , �-- '• -· - L£ID(I ·- x ·- y ·- z ' ,.. - ""'··-...... \ "" '. Olll'e l t i-m !

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