Using SpaceWire time codes for spacecraft time synchronization: SpaceWire missions and applications, short paper

This is a high-level study into the validation of a unified electric power and communications architecture for modern spacecraft systems. We leverage from blending the European Cooperation for Space Standardisation (ECSS) SpaceWire and the IEEE 802.3 Power over Ethernet (PoE) standards for a common onboard power and communications interface. The focus of the work has been communication performance. The requirements from the protocols of both standards were analysed and combined to create a full protocol stack for SpaceWire PoE. The stack is implemented on an embedded platform represented as a proof-of-concept SpaceWire PoE system. The results of functional testing demonstrate SpaceWire PoE as a valid solution that meets the requirements of both protocols. For the 100 Mb/s links, the SpaceWire PoE throughput is on a par (97.39%) with Ethernet (97.52%) and SpaceWire (99.2%). Shared communication and power architecture is intended for decentralised operation achieving greater autonomy of the integrated subsystems. This potentially may lead to standardisation of electrical, mechanical and communication interfaces across spacecraft subsystem manufacturers, easing harness complexity and routing during the assembly, integration and test (AIT) phase of the spacecraft as well as saving mass and launch cost.

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“…These studies include broader quality of services such as: i. Distribution of SpaceWire time codes for spacecraft synchronisation [17]. ii.…”

Section: Related Researchmentioning

confidence: 99%

SpaceWire communications in power over ethernet environment

Martin

Zaidi

2022

CEAS Space J

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Design of a mission network system using SpaceWire for scientific payloads onboard the Arase spacecraft

Takashima

Ogawa

Asamura

et al. 2018

Earth Planets Space

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Arase is a small scientific satellite program conducted by the Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency, which is dedicated to the detailed study of the radiation belts around Earth through in situ observations. In particular, the goal is to directly observe the interaction between plasma waves and particles, which cause the generation of high-energy electrons. To observe the waves and particles in detail, we must record large volumes of burst data with high transmission rates through onboard mission network systems. For this purpose, we developed a high-speed and highly reliable mission network based on SpaceWire, as well as a new and large memory data recorder equipped with a data search function based on observation time (the time index, TI, is the satellite time starting from when the spacecraft is powered on.) with respect to the orbital data generated in large quantities. By adopting a new transaction concept of a ring topology network with SpaceWire, we could secure a redundant mission network system without using large routers and having to suppress the increase in cable weight. We confirmed that their orbit performs as designed.

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Using SpaceWire time codes for spacecraft time synchronization: SpaceWire missions and applications, short paper

Cited by 2 publications

References 1 publication

SpaceWire communications in power over ethernet environment

SpaceWire communications in power over ethernet environment

Design of a mission network system using SpaceWire for scientific payloads onboard the Arase spacecraft

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