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Signal Flow Graphs01:18

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Signal-flow graphs offer a streamlined and intuitive approach to representing control systems, providing an alternative to traditional block diagrams. These graphs use branches to symbolize systems and nodes to represent signals, effectively illustrating the relationships and interactions within the system.
In a signal-flow graph, branches denote the system's transfer functions, while nodes represent the signals. The direction of signal flow is indicated by arrows, with the corresponding...
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SpaceART SpaceWire Sniffer for Link Monitoring: A Complete Communication Analysis in a Time-Constrained Test

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  • 1Department of Information Engineering, University of Pisa, 56122 Pisa, PI, Italy.

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Summary

SpaceWire (SpW) on-board communication requires specialized Electrical Ground Support Equipment (EGSE). The SpaceART EGSE Emulator and SpW Sniffer effectively tested SpW communication for a specific mission scenario, ensuring time constraint compliance.

Keywords:
EGSEOBDHSpaceARTSpaceWirelink analysersnifferspacecrafttest equipmentvalidation

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Area of Science:

  • Space Engineering
  • Aerospace Communications

Background:

  • SpaceWire (SpW) is the standard for on-board communication in current space missions.
  • Developing SpW-compliant devices necessitates specialized Electrical Ground Support Equipment (EGSE) for testing.
  • General-purpose SpW EGSEs may not support all mission-specific communication requirements.

Purpose of the Study:

  • To evaluate the effectiveness of the SpaceART EGSE Emulator for generating and processing SpW packets in a time-constrained scenario.
  • To assess the communication between a device and an Instrument Control Unit (ICU) using SpW.
  • To validate the performance of the SpaceART SpW Sniffer for unobtrusive link analysis and time constraint verification.

Main Methods:

  • Utilized the SpaceART EGSE Emulator to generate and process SpW packets for a specific mission use-case.
  • Employed the SpaceART SpW Sniffer for unobtrusive monitoring and analysis of the SpW link.
  • Conducted comprehensive tests to verify SpW communication and assess compliance with defined time constraints.

Main Results:

  • The SpaceART EGSE Emulator successfully generated and processed specific SpW packets tailored for the ICU communication.
  • The SpaceART SpW Sniffer provided unobtrusive analysis of exchanged SpW data.
  • External assessment of time constraint compliance was achieved through the Sniffer's monitoring capabilities.

Conclusions:

  • The SpaceART EGSE Emulator and SpW Sniffer are effective tools for testing mission-specific SpW communication.
  • Unobtrusive link analysis using the SpW Sniffer is crucial for validating on-board communication and ensuring mission success.
  • The tested EGSE setup facilitated the verification of time-critical SpW communication for the Instrument Control Unit.