ECSS New Work Item Proposal
(including Working Group Terms of Reference)
NWIP-006
Issue 1.1
25 Jan 2012
Gyros terminology and performance requirements
CHANGE LOG
Issue 1.0
22ND November 2011
First Version sent for TA Vote for Approval
Issue 1.1
25th January 2012
First revision
1 Purpose of NWIP
The purpose of the NWIP is to initiate an ECSS WG aimed at producing a Gyros terminology
and performance requirements standard, analogue to the ECSS-E-ST-60-20C (“Star sensors
terminology and performance specification”) already produced for the star sensors, taking
benefit of existing standards on gyros (see §4).
2 Justification and Scope of document
Some gyros terminology and performance requirements information are spread over several
documents, mainly gyros suppliers (proprietary) documents and IEEE standards. The IEEE
standards insist more on the general specification, the testing and the qualification process
than on the performance requirements.
A synthesis on the gyros terminology and functional performance is needed
- to define a terminology consistent with the diverse gyro technologies and in line with
the gyros user needs,
- as well as to define performance metrics and comprehensive performance
requirements specification that will allow comparison of gyros from differing
suppliers
Four main topics are intended to be addressed in the draft document:
1. Terminology
2. Descriptive overview
3. Functional requirements
4. Performance requirements.
The verification topic is restricted to performance requirements verification. The other
verification topics are considered tackled in other standards and technology-specific in some
aspects ; the completeness of this new standard and its consistency wrt other existing
standards will be an objective of the WG.
The terminology chapter will encompass the terms from the gyro users semantics rather than
the gyros manufacturers detailed vocabulary, in order to avoid terms which are specific to
Page 1 of 4
ECSS New Work Item Proposal
(including Working Group Terms of Reference)
NWIP-006
Issue 1.1
25 Jan 2012
gyros technologies and/or gyros suppliers as well as not used outside of the gyro suppliers
internal documentation.
The descriptive overview will provide description of the main types of existing gyros and of
their main components as well as a digest of the diverse technology principles used (FOG,
HRG,…).
The functional requirements chapter will address redundancy architecture, time
synchronisation and time tagging, start-up and transient behaviours.
The performance requirements chapter will list and define the performance requirements of
gyros (e.g. Angular random Walk, Rate Random Walk, Bias Instability,…), the related errors
sources as well as the recommended verification method(s) (i.e. Allan variance).
The detailed scope shall be defined by the WG during its first working meeting.
3 Intended programs and target users
All types of European Space programmes embarking gyros.
4 Inputs for WG activities
The draft shall be consistent with the complete set of ECSS standards.
While the Working Group may consider any other relevant information during its activities,
the following documents shall be considered:
1.
2.
3.
- Technical references
4.
ECSS-E-ST-60-10C
Control Performance
5.
ESSB-HB-E-003
ESA Pointing Error Engineering Handbook
6.
ECSS-E-ST-60-20C
specification
Stars sensors terminology and performance
7.
IEEE Std 517-1974
Guide and Test Procedure for Single-Degree-ofFreedom Rate-Integrating Gyros
8.
IEEE Std 528-2001
9.
IEEE Std 529-1980
Supplement for Strapdown Applications to IEEE
Standard Specification Format Guide and Test Procedure for Single-Degree-of Freedom Rate-Integrating Gyros
10.
ANSI/IEEE Std 813-1988
IEEE Specification Format Guide and Test Procedure
for Two-Degree-of-Freedom Dynamically Tuned Gyros
11.
IEEE Std 647-1995
IEEE Standard Specification Format Guide and Test
Procedure for Single-Axis Laser Gyros
12.
IEEE Std 952-1997
IEEE Standard for Inertial Sensor Terminology
IEEE Standard Specification Format Guide and Test
Page 2 of 4
ECSS New Work Item Proposal
(including Working Group Terms of Reference)
NWIP-006
Issue 1.1
25 Jan 2012
Procedure for Single-Axis Interferometric Fiber Optic Gyros
13.
Existing gyros requirements specification documents (from Space programs
ITTs)
- Complementary references
14.
ECSS-P-00
Standardisation Policy
15.
ECSS-P-001
Glossary of Terms
16.
ECSS-E-00
Space Engineering - Policy and Principle
17.
ECSS-M-30
Project phasing and planning
18.
ECSS-E-10A
Space engineering – System engineering
19.
ECSS-E-ST-10-09C
Reference Coordinate System
20.
ECSS-E-60A
Control engineering
5 Activities and tasks
The Working Group shall perform the following activities:
a.
The WG shall prepare a work-plan for its activities conforming to the milestones (see
§6), and describing the schedule of activities and resources needed to achieve the
schedule.
b.
The WG shall prepare for information and checking, an outline of the proposed
standard identifying at least the table of contents and possible source documents to
generate the standard.
c.
The WG shall issue a first draft of the standard to get feedback from experts and project
representatives from industry and agencies
d.
The WG shall produce a draft of the standard in line with the scope and the convenor
shall send it to the ECSS Secretariat for checking conformity.
e.
The WG convenor shall resolve with the ECSS Secretariat any comment from the
conformity check, involving the WG if the comments impact on the technical contents.
After resolution of the comments, he shall produce a final draft for Review.
f.
The WG convenor shall update the draft with the accepted dispositions to the DRRs,
involving the WG if the changes to introduce affect heavily the technical content of the
standard, and submit the final draft to the ECSS Executive via the ECSS Secretariat.
6 Milestones
April 2012
WG kick-off (detailed scope of the document)
Q3 2012
Document outline draft
Q1 2013
First draft issue
Q2 2013
Review of comments from experts and project representatives from industry
and agencies
Q3 2013
Q4 2013
Submit WG draft for conformity check
Submit WG draft for formal review
Page 3 of 4
NWIP-006
ECSS New Work Item Proposal
(including Working Group Terms of Reference)
Issue 1.1
25 Jan 2012
7 WG composition
The WG shall include representatives from gyros users and experts from the AOCS
community (agencies, Gyros procurement, AOCS architect, Gyros suppliers), as support to
the document preparation.
8 Manpower and missions
WG Chair and supports
To be refined at Kick-off meeting
TBD man-year
9 Outputs
The outputs of this NWIP should be:
- work plan
- periodical progress reports
- outline of the document
- first draft of the document for comments
- draft of the document for conformity check
- draft of the document for formal review
- Updated draft after public review.
10 Originator
This section shall contain the name, organization and address, telephone number, e-mail of
the originator.
Name:
Bénédicte Girouart
Organization:
ESA – Control Systems Division
Address:
ESTEC - Keplerlaan 1 PO Box 299 2200 AG Noordwijk ZH - The Netherlands
Telephone:
+31 (0) 71 565 87 14
e-mail:
benedicte.girouart@esa.int
Page 4 of 4