Redundancy Management Unit (RMU)

Our redundant avionics solution includes two Integrated Avionics Units and a triple redundant Redundancy Management Unit (RMU). This system provides an avionics solution for long duration GEO or other missions, as well as shorter missions with extremely high reliability requirements. The redundant system accommodates specific mission requirements by tailoring existing IAU design and board heritage. The RMU design accommodates hot, warm, or cold sparing in an A/B side implementation. Features include scheduled “wake up” for verifying “B” side functionality and various watch dog functions.

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Features

Literature

Qty 2 4-pole relays (12A each pole)
Qty 2 Auxiliary 28V power relays (4.5A)
Qty 33 X-strapped RS422/LVDS Rx
Qty 36 X-strapped RS422/LVDS Drivers
Qty 4 LVDS X-Point switches
Qty 20 Analog X-strap circuits
Qty 2 RMU current analogs
Qty 2 Lazarus relays
TMR circuitry
+3.3V & +5V Converters, EMI filters
Hosts ARC & AUX boards

ARC Board

RDB Power Control
Qty 3 functionally identical circuits (SFT)
Qty 3 CXS-810, DMX, & EGSE uplink command decode
Qty 3 CMD and TLM interfaces to primary and secondary IAU each
512K (effective) bytes spacecraft state data storage
Manual / Autonomous modes
TMR circuitry for IAU converter inhibits
Qty 3 fused protected +3.3V converters and EMI filters

AUX Board

Qty 28 total RS422 / LVDS Drivers
Currently configured for 24 RS422 & 4 LVDS drivers

Redundancy Features

2 Parallel IAUs (A/B Side
1 RMU

Autonomous Mode

Monitors health of primary IAU, resets primary IAU on anomaly detection
Make before break side swap to Secondary IAU on next anomaly

Manual Mode

Hardware uplink commandable control over all functions
Make before break side swap to Secondary IAU on next anomaly

Spacecraft State Storage

512K bytes TMR’d storage
State data periodically refreshed by primary IAU
On side swap, state data available to secondary IAU for fast recovery

Cross-Strap

X-strap control of RS422, LVDS, SERDES, and analog interfaces
I/O directed to primary IAU when on, autonomously redirected to secondary IAU on side swap

QTY 2 Diode Assemblies