Telescience testbed examination aboard Japanese Experiment Module (JEM): life and material science experiments.

Area of Science:

• Space Science and Technology
• Telescience Operations
• Human-Computer Interaction in Space

Background:

• The National Space Development Agency of Japan (NASDA) conducted a telescience ground testbed experiment in 1991.
• Telescience is crucial for enabling remote control and monitoring of space experiments.
• Understanding communication requirements is vital for effective space mission operations.

Purpose of the Study:

• To define scientists' communication requirements for telescience.
• To assess the impact of transmission delay and bandwidth on experiment operations.
• To evaluate the performance of telescience system components.

Main Methods:

• Conducted a ground testbed experiment simulating space operations.
• Utilized three typical experiments: microscopic operations, image furnace, and onboard training.
• Analyzed data transmission rates (kbps/Mbps) and roundtrip communication delay (seconds).

Main Results:

• Motion video at 320 kbps was sufficient for general observation and communication.
• Detailed observation in microscopic experiments required 1.5 Mbps or higher bandwidth.
• A 4-second roundtrip transmission delay was acceptable for interactive communication.

Conclusions:

• Bandwidth requirements for telescience vary based on the complexity of experimental observation.
• Effective telescience relies on balancing communication bandwidth and acceptable transmission delays.
• The findings informed the design and implementation of future space communication systems.