ISO INTERNATIONAL STANDARD 14950 First edition 2004-02-15 Space systems Unmanned spacecraft operability Systemes spatiaux - Opérabilite des satellites non habités Reference number ISO 14950:2004(E) SO ISO2004 E*eqr[tkijvgf"d["WPG.'E1"1gpqxc."8I"4:226"Ocftkf.'Urckp"cmn'tkijv "Ygf"Hgd'36*27<3 29"WVE"4246 ISO 14950:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel.+ 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii E*eqr[tkijvgf"d["WPG.'E1"1gpqxc."8I"4:226"Ocftkf.'Urckp"cm'tkijv'tgugtxgf+*"Ygf"Hgd’36*27<39<29"WVE*4246 @IsO2004-Allrightsreserved knni"cwintiInf ISO14950:2004(E) Contents Page Foreword IV 0 Introduction. iv 0.1 Spacecraft operation ....... 0.2 Spacecraft operability... 0.3 Conventions .... 0.4 Guidelines for applicability ..... 1 2 Normativereferences 3 Termsand definitions. 4 Abbreviated terms.. 5 Autonomy levels 6 General requirements 6.1 Observability . 6.2 Commandability 8 6.3 Compatibility 6.4 Security 8 6.5 Safety. 6.6 Flexibility 6.7 Efficiency 9 6.8 Testability .... 6.9 Applicability matrix. 10 7 Detailedrequirements .10 7.1 Spacecraftobservability requirements.. 10 7.2 Spacecraft commandability requirements 12 7.3 Memory management ..... 14 7.4 On-board processing functions ... 15 7.5 Equipment/subsystem-specificrequirements. 19 Annex A (informative) Mission constants ili cwvintkInfl ISO 14950:2004(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO non-governmental, in liaison with sO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. Sc 14, Space systems and operations iv IS0 2004 - All rights reserved rwvintkInff ISO 14950:2004(E) 0 Introduction 0.1 Spacecraft operation Theoperationofaspacecraftisanactivityperformedfromamissioncontrolcentreinorderto: a) ensure availability of mission and science products/services or data; b) carry out routine housekeeping operations; c) recover from on-board contingencies; lifetime. 0.2 Spacecraft operability The operability is a feature of the spacecraft itself that enables a specified ground segment comprising hardware, software, personnel, and procedures, to operate the space segment during the complete mission lifetime of the spacecraft, by using a minimum of resources, whil