Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 37 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.6 Combined Micropropulsion (MPS) Interfaces
The following requirements will be considered as TBC pending Micropropulsion supplier selection. The
requirements given are indicative of the interfaces and necessary functionality to be provided.
The Gaia Combined MPS subsystem is controlled and monitored by the Spacecraft Micropropulsion
Electronics unit (MPE) and comprises:
2 x Micropropulsion Electronics (MPE) units in (1+1) cold redundancy, providing the control and monitoring
of:
• 16 x Latch Valves (LV) operating in (8+8) cold redundancy
• 16 x Latch Valves status micro-switches operating in (8+8) cold redundancy
• 16 x Flow Control Valves operating in (8+8) cold redundancy to control 2 banks of (8+8)
Microthrusters
• 16 x Gas Flow Monitoring (GFM) sensors operating in (8+8) cold redundancy to measure flow
through 2 banks of (8+8) Microthrusters for closed-loop control
• 16 x Pressure Transducers operating in (8+8) cold redundancy for Regulated Pressure monitoring
AVI-503/CREATED/T
The Avionics SCOE shall provide interfaces to the MPE to simulate the presence of the MPS
subsystem components.
AVI-504/GSE-SYS-735/T
The MPS Interfaces shall comprise the following functions.
LV Command Pulse Acquisition (16 LV, 1 x ON and 1 x OFF commands per Latch Valve)
LV Status Simulation (1 micro-switch simulation per Latch Valve)
FCV Command Pulse Acquisition (16 FCV)
FCV Gas Flow Monitoring Sensor Simulation (16 Sensors)
16 x Pressure Transducer Simulations
3.6.6.1 MPS LV Command Pulse Acquisition
AVI-3558/EIU-706, GSE-SYS-737/T
The MPS LV Command Pulse Acquisition interface shall be provided by fixed loads (32x) simulating
the OPEN and CLOSE coils for each of 16 LV.
AVI-3559/EIU-706, GSE-SYS-737/T
LV Command Acquisition interface shall conform to the following specifications: [AD06] Table 3.5-35
(Latch Valve Interface Specification - Receiver Circuit Specification).
AVI-3560/GSE-SYS-737/T
LV Command Pulse Acquisition shall provide Latch Valve state (OPEN/CLOSE) and measurement of
the Command pulse width, as detailed below:
Pulse WIDTH resolution
100.0 µs - for nominal 50-100ms pulse
Latch Valve STATE OPEN = acquisition of a 'valid' pulse on the corresponding LV
OPEN coil
CLOSED = acquisition of a 'valid' pulse on the corresponding
LV CLOSE coil
A 'valid' pulse shall be as defined in [AD06] Table 3.5-35.
Table 3.6-4: MPS - LV Command Pulse Measurement Specification
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