Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 46 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.9 Standard High Power Pulse Command Generation
The Gaia EIU provides 48+48 Standard High Power Pulse Commands (SHP) for de-centralised power
switching or reconfiguration of Spacecraft units.
AVI-3599/CREATED/T
To allow testing of the Spacecraft when the EIU is missing the Avionics SCOE shall provide SHP
generation in place of the EIU.
AVI-1075/EIU-754,EIU-755,GSE-SYS-398/T
The Avionics SCOE shall provide simulation of 96 SHP outputs in accordance with the following
interface specification: [AD06] Table 3.5-22 (SHP Command Source Specification).
AVI-1091/GSE-SYS-398/T
In all test modes, the Avionics SCOE shall generate SHP commands asynchronously in accordance
with commands received on the CDMU/EIU SpaceWire BUS.
AVI-3600/GSE-SYS-398/T
In all test modes, generation of an SHP command shall occur within 10ms of reception of its
corresponding command received on the CDMU/EIU SpaceWire BUS.
3.6.10 Standard High Power Pulse Command Acquisition
The Gaia Spacecraft provides Standard High Power (SHP) Pulse Commands for de-centralised power
switching and reconfiguration of Spacecraft units. SHP generation is distributed among the Spacecraft units
as follows:
• 48+48 Type 1 SHP - CDMU
• 48+48 Type 1 SHP - EIU
AVI-1144/EIU-754,EIU-755, CDMU-754,CDMU-755, GSE-SYS-744/T
The Avionics SCOE shall provide interfaces to acquire 192 SHP commands in accordance with the
following interface specification: [AD06] Table 3.5-23 (SHP Command Receiver Specification)
AVI-1626/CREATED/T
SHP Acquisition shall provide status (ON/OFF) and measurement of the individual command pulse
widths as detailed below:
Pulse Width measurement resolution 100.0 us - for nominal pulse width 32-64ms
Table 3.6-7: SHP Command Pulse Measurement Specification
AVI-1890/CREATED/T
Measurement of SHP Command pulses shall be triggered asynchronously by detection of an
incoming pulse with the following specifications:
• Pulse Width > 1ms
• Pulse Amplitude > 10.0V
AVI-1629/CREATED/T
SHP status (ON/OFF) shall be made available to the RTS for closed-loop testing.
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