Internal Thales Alenia Space

INTERNAL THALES ALENIA SPACE

/ / Reference:: / MTG-TAF-IR-RS-0493
Date:: / 22/07/2011
Issue:: / 231 / Page:: / 1/1616
MTG
IRS
Receiver Assembly Unit (RAU)
Interface Requirement Document
[DRL code :: NA]
[AD code :: AD-03-IRRAU-02]
[PT code :: S121342]
[DRL code:: ]
[AD code:: ]
[ PT code :: indiquer le ou les n° du Product Tree]
Written by / Responsibility
+ handwritten signature if no electronic workflow tool
DAMIEN DUMESTIER / IRS Radiometric Performances Analysis responsible
Verified by
DENIS SCHEIDEL / IRS Technical Manager
VERONIQUE GROSSETETE / Product Assurance Manager
JP CHAMBELLAND / Procurement Manager
Approved by
BRUNO BAILLY / IRS Project Manager

Approval evidence is kept within the documentation management system.

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/ / Reference:: / MTG-TAF-IR-RS-0493
Date:: / 22/07/2011
Issue:: / 231 / Page:: / 1/1616

CHANGE RECORDS

ISSUE / DATE / § CHANGE RECORDS / AUTHOR
1 / 22/07/2011 / First Issue / D Dumestier
2 / 16/09/2011 / Update after pre-TEB / D. Scheidel
3 / 09/11/2011 / Other optical connector then FP/APC can by proposed

DISTRIBUTION LIST

Company / Name

TABLE OF CONTENTS

1.subject

2.applicable documents

2.1Applicable documents

2.2Applicable norms and standards

2.3Reference documents

3.Mechanical interfaces

3.1Dimensions, Mass

3.1.1Alignment

3.2Inertia, Center

3.3Location of connectors

3.4Stiffness

4.Thermal interfaces

4.1Interface temperature requirements

4.2Power dissipation

4.3Thermal contact interface requirements

4.4Thermal coatings

5.Electrical interfaces

5.1Provided to the RAU

6.Optical Interfaces

6.1.1Interface the laser

1.subject...... 6

2.applicable documents...... 7

2.1Applicable documents...... 7

2.2Applicable norms and standards...... 7

2.3Reference documents...... 7

3.Mechanical interfaces...... 8

3.1Dimensions, Mass...... 8

3.1.1Alignment...... 8

3.2Inertia, Center...... 8

3.3Location of connectors...... 9

3.4Stiffness...... 9

4.Thermal interfaces...... 10

4.1Interface temperature requirements...... 10

4.2Power dissipation...... 10

4.3Thermal contact interface requirements...... 10

4.4Thermal coatings...... 11

5.Electrical interfaces...... 11

5.1Provided to the RAU...... 11

6.Optical Interfaces...... 12

6.1.1Interface the laser...... 12

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/ / Reference:: / MTG-TAF-IR-RS-0493
Date:: / 22/07/2011
Issue:: / 231 / Page:: / 1/1616

TABLE OF ANNEX

Annex 1 :: IRD RAU Drawing

LIST OF FIGURES

Figure 5.11 :: Laser connector end

LIST OF TABLES

Table 4.11:: Temperature design

Table 4.12 :: Temperature stability

Table 5.11 :: RAU power supply characteristics

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/ / Reference:: / MTG-TAF-IR-RS-0493
Date:: / 22/07/2011
Issue:: / 231 / Page:: / 1/1616

1.subject

This document is collecting the Interface Requirements applying to the IRS Receiver Assembly Unit (RAU).

It is a complement of the RAU User Requirements Documents. It aims at specifying the RAU interfaces; for general.

For general RAU overview, please refer to URD.

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/ / Reference:: / MTG-TAF-IR-RS-0493
Date:: / 22/07/2011
Issue:: / 231 / Page:: / 1/1616

2.applicable documents

This chapter provides the list of applicable and reference documents.

2.1Applicable documents

Refer to list provided within Generic SOW for Subsystem/Equipment procurement, Document reference MTG-TAF-SA-SW-0153 with applicability defined in the dedicated RAU Specific SOW, Document reference MTG-TAF-IR-SW-0456 issue 01.

2.2Applicable norms and standards

2.3Reference documents

Reference documents are the input of the present document.

Id / Title / Reference
RD1 / IRS RAU URD / MTG-TAF-IR-RS-0484
All rights reserved, 2018, Thales Alenia Space / 100181547K-EN-3

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/ / Reference:: / MTG-TAF-IR-RS-0493
Date:: / 22/07/2011
Issue:: / 231 / Page:: / 1/1616

3.Mechanical interfaces

3.1Dimensions, Mass

#Reference [MTG-IRS-IRD-RAU-REQ-001]

The mass of the RAU shall be lower than 0.5 kg including maturity margin (TBC).

Parent(s) :

#Reference [MTG-IRS-IRD-RAU-REQ-002]

The maximum volume of the RAU shall be lower than: L = TBDmm180mm, W= TBDmm 180mm and H= TBDmm55mm. (TBC) as presented in the drawing in Annex 1.

Parent(s) :

3.1.1Alignment

The RAU is mechanically mounted under the optical bench with three screws (TBC); size and numbers to be discussed with the contractor in an iterative way.

#Reference [MTG-IRS-IRD-RAU-REQ-003]

The RAU mechanical interfaces must allow to alignaligning the unit with the interferometer over the following combined ranges:

In plane translation along the 2 axis ::> 1mm
Rotation in plane :: > 3 mrad

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-030]

The subcontractor shall verify the RAU constraints under survival environments and optical performances (mainly stability) under operational environment. Thermal environments are specified above.

Thermo-elastic effects and interface defects shall be considered in the computation as described hereafter.

The deformations at the OBU interface plane for short term and long-term effects are the following (TBC):

In plane surface stability worst case / Out of plane distortion
Material / Flatness (mm) / Surface roughness
(µm) / Thermal effects (mm/m/°K) / Humidity effects (mm/m) / Maximum distortion*
CFRP / 0.01 / 1.6 / 1.5
any direction / 30
any direction / ± 10 µm at integration ± 30 µm between Bol and Eol

* With respect to a plane defined by any fixation points between the equipment and the structure, the other point(s) could be distant from this plane of the specified value. For the calculation, an infinitely rigid interface shall be considered.

Parent(s):

3.2Inertia, Center

#Reference [MTG-IRS-IRD-RAU-REQ-004]

The mass and the Centre of Gravity shall be indicated by the Supplier and its evolution through the design life traced and reported in the Interface Control Document subsystem design documentation.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-005]

The mass shall be measured with an accuracy of +/- 3% TBC.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-006]

The centre of gravity of the RAU shall be measured with an accuracy of +/- 2 mm (TBC) in all directions.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-007]

Inertia and associated uncertainty and its evolution through the design life shall be traced and reported in the Interface Control Document subsystem design documentation.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-008]

Inertia values shall be given related to the centre of gravity.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-009]

Moments of inertia shall be assessed on the basis of nominal mass values.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-10]

The moments of inertia shall be provided with a +/- 5% tolerance.

Parent(s) ::

3.3Location of connectors

#Reference [MTG-IRS-IRD-RAU-REQ-011]

The interfaces shall be compliant with the connectorsconnector’s location given in RAU Interface drawing presented in TBD annex1drawing.

Parent(s) ::

3.4Stiffness

#Reference [MTG-IRS-IRD-RAU-REQ-012]

The RAU package shall have a first eigen- frequency higher than 450 Hz (TBC).

Parent(s) ::

4.Thermal interfaces

The optical bench is a honeycomb sandwich made of CFRP skins. It is thermally controlled by ATC (sensors & heaters).

Thus, the RAU thermal control is mainly conductive thanks to the interferometer optical bench, which insures ndirectly, its thermal control. A thermal cavity encloses the interferometer bench equipments. The aim of this cavity is to insure a homogenous and stable radiative thermal environment to the optical parts such as the RAU.

4.1Interface temperature requirements

See URD.

#Reference [MTG-IRS-IRD-RAU-REQ-013]

The RAU shall meet the performance requirements with following design temperature at its Temperature Reference Point (TRP).

Table 4.11: Temperature design

Parent(s) :

#Reference [MTG-IRS-IRD-RAU-REQ-014]

The RAU shall meet the performance requirements with following temperature stability at its Temperature Reference Point (TRP). (values are TBC)

Table 4.12 : Temperature stability

Parent(s) :

4.2Power dissipation

#Reference [MTG-IRS-IRD-RAU-REQ-015]

The power dissipation of the RAU shall be less than 1 W (including maturity margin).

Parent(s) ::

4.3Thermal contact interface requirements

#Reference [MTG-IRS-IRD-RAU-REQ-016]

The mounting interface of RAU shall provide a thermal contact surface higher than than 108 C cm² (TBC).

Parent(s) ::

4.4Thermal coatings

#Reference [MTG-IRS-IRD-RAU-REQ-017]

The emissivity of the RAU shall be higher than 0.85 (TBC).

Parent(s) ::

5.Electrical interfaces

5.1Provided to the RAU

#Reference [MTG-IRS-IRD-RAU-REQ-026

All the electrical interfaces provided to the RAU are fully redundant (one Nominal and one Redundant).

#Reference [MTG-IRS-IRD-RAU-REQ-018]

The RAU shall be supplied by secondary power lines with the following characteristics (values are TBC):

Parameters

/ +Vanalog / -Vanalog
Particularity / Common return line
Nominal Voltage (V) / +6 / -6
Tolerance (V) /  5% /  5%
Absolute maximum rating (V) / +10 / -10
Imin (mA) / 70mA / 70mA
Imaxi (mA) / 100mA / 100mA
Short circuit current / 200mA / 200mA
Differential noise
0Hz < BP < 50MHz / <20mVpp / <20mVpp
Reactive load / 1µF<C<20µF
1µH<H<10µH / 1µF<C<20µF
1µH<H<10µH
Switch on/off order / No switch on nor switch off order

Table 5.05.11 : RAU power supply characteristics

Parent(s) ::

Note: An equivalent power source impedance network will be provided in the next issue of the IRD.

#Reference [MTG-IRS-IRD-RAU-REQ-019]

The secondary power lines shall be referenced to the structure at the RAU side.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-020]

The 6 metrology6 RAUsignaloutputsoutputs shall be 100-Ohm differential balanced lines. of 100 Ohm.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-026]

All 6 metrology outputs shall be fully redundedredundant. The nominal (respectively redundant) activated outputs shall be activated when the RAU is power supplied by the nominal (respectively redundant) ICE.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-021]

All 6 metrology outputs shall be active at the same time.

Parent(s) ::

6.Optical Interfaces

6.1.1Interface with the interferometer

Reference [MTG-IRS-IRD-RAU-REQ-031]

The RAU created optical beams are injected into the interferometer; the overall envelope shall comply, without obscuration, with the optical path as specified page 3 of annexe 1 (left part).

#

Reference [MTG-IRS-IRD-RAU-REQ-032]

The RAU shall collect the optical beams coming from interferometer; the overall envelope shall comply, without obscuration, with the optical path as specified page 3 of annexe 1 (right part).

6.1.16.1.2Interfaceswith the laser

Copy laser fiber specification

#Reference [MTG-IRS-IRD-RAU-REQ-022]

The RAU shall accept a nominal and a redundant Laser beam provided on a polarization maintaining fiber.

The laser beam polarization ratio at RAU interface level (connector) is at least 50.

At laser connector end, the slow axis is oriented according to the (reduced) alignment pin with a tolerance better than 5°.

The input interferogram (see URD) will exhibit intensity noise in relation with the laser spectral noise; transposed within the maximum frequency bandwidth of the RAU, the One-sided Power Spectral Density (PSD) of the Relative Intensity Noise (RIN) will be lower than: 10-10/Hz.

Parent(s) ::

The laser beam polarization ratio at RAU interface level (connector) is at least 50.

At laser connector end, the slow axis is oriented according to the (reduced) alignment pin with a tolerance better than 5°.

Figure 1.15.11 : Laser connector end

#Reference [MTG-IRS-IRD-RAU-REQ-023]

The laser must be interfaced thanks to FC/APC (Reduced key) connectors mounted on the RAU structure.

Parent(s) ::

Note: An alternative qualified connector can be proposed; the final acceptance is submitted to the Prime.

#Reference [MTG-IRS-IRD-RAU-REQ-024]

At delivery, the laser connection must accept at least 50 connections/disconnection without performance impact.

Parent(s) ::

#Reference [MTG-IRS-IRD-RAU-REQ-025]

The RAU shall include the following components:

2 Optical fiber connectors, one for each of nominal and redundant laser.

Parent(s) ::

Annex 1: IRD RAU Drawing (3 pages).

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RAU output – Injection Folding mirror:

d1 = 71.8 mm

Injection Folding mirror- CC Apex plane:

d2 = 182.3 mm

CC Apex plane - Reception Folding mirror:

d3 = 171 mm

Reception Folding mirror – RAU reception:

d4 = 164.3 mm

Beamsplitter SP and CP optical thickness:

eZnSe = 20 mm

Overall optical injection and detection paths

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Annex 1 : IRD RAU Drawing

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END OF DOCUMENT

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