APPENDIX AVI212 Spezifikationen PDF herunterladen (Seite 41)

Gaia

GAIA.ASU.SP.ESM.00007

Issue 2.00

Page 41 of 79

Astrium Ltd owns the copyright of this document which is supplied in confidence and which shall not be used for any purpose other than that for which it is supplied and shall not in

whole or in part be reproduced, copied, or communicated to any person without written permission from the owner.

GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc

3.6.7 Fine Sun Sensor Interfaces

Gaia comprises 3 Fine Sun Sensors (FSS) cross-strapped to each EIU.

Each FSS provides (see Figure 3.6-3):

• A Detector Voltage signal to the EIU, selected from one-of-eight multiplexed voltages;

• Q1 - Q4 being representative of the sun incidence on each of the FSS detector quadrants

• T1 - T4 being test voltages to allow closed-loop system testing with FSS HWIL.

• 3 address lines inputs (A0 - A2) for multiplex selection.

• A 'Sun Presence' voltage signal to the EIU (being the sum of Q1 - Q4).

• Inputs for 4 test voltages (T1 - T4) to verify operation of the FSS conditioning electronics and

allow FSS HWIL testing.

• A built-in thermistor to provide temperature data to the EIU.

Fine Sun Sensor

Current/Voltage Conversion

& Signal Conditioning

Signal Selection

T1 T2 T3 T4

4-Quadrant

Detector

Selected

Detector

Voltage

Thermistor

Sun-Presence

Voltage

(sum[Q1.Q4])

EIU

Thermistor

Acquisition

Analog Voltage

Acquisition

Analog Voltage

Acquisition

CMOS bi-level

A1 A2

Secondary

Power Supply

±14V

Figure 3.6-3: FSS - Block Diagram

AVI-4142/CREATED/T

The Avionics SCOE shall provide facilities for FSS Simulation (towards the EIU) and for stimulating

the FSS with test voltages when the real FFS are HWIL.

AVI-4143/CREATED/T

It shall be possible to select either FSS Simulation mode or FSS HWIL Test for any of the 3 FSS

independently.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 78 79

Kommentare zu diesen Handbüchern

Keine Kommentare

APPENDIX AVI212 Spezifikationen Seite 41

Kommentare zu diesen Handbüchern