Edison Demonstration of Smallsat Networks (EDSN) was a failed (launch failure)

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constellation A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the earliest constellation ...

by NASA Ames, developed as a technology demonstration of satellite networking. The constellation would have consisted of 8 identical satellites. The satellites followed the CubeSat specifications for a 1.5U CubeSat. EDSN was funded through the Small Spacecraft Technology Program (SSTP). Additionally, NASA Ames has partnered with NASA Marshall,

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, and

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. All 8 CubeSats were destroyed during a launch failure of the Super Strypi rocket on November 3, 2015.

Mission

The eight identical spacecraft used absolute timing obtained from GPS satellites to maintain a schedule. Each day, one satellite would have acted as a Captain and the rest would have acted as Lieutenants. Each spacecraft was able to act as a Captain, and the role of Captain would have rotated through the constellation each 25-hour period. Lieutenants would only communicate with the Captain, and the Captain would have been responsible for downlinking to an Earth station.

Lifetime

NASA had estimated a 60-day mission lifetime, at which time the satellites would have drifted apart beyond the 100–120 km estimated range of the cross link and would have no longer been able to network.

Orbit

The constellation was planned for a 500 km altitude.

Design

EDSN was using Triangular Advanced Solar Cells (TASC) for power generation. Intersatellite communications would have been on

UHF Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (on ...

via a tapespring antenna. Ground communications would have been via an S-band patch antenna. The spacecraft would have used magnetometers and

gyroscopes A gyroscope (from Ancient Greek γῦρος ''gŷros'', "round" and σκοπέω ''skopéō'', "to look") is a device used for measuring or maintaining orientation and angular velocity. It is a spinning wheel or disc in which the axis of rot ...

as attitude determination instruments and reaction wheels and torque coils for attitude control. Cross link would have occurred via the UHF transceiver and on a UHF monopole with an estimated maximum range of 100–120 km. The link would have been initiated when the captain pings the specific Lieutenant's ID. The specified Lieutenant would have then responded with data to be downlinked. Downlink would have occurred on S-Band between the current captain and ground station. The flight computer was a Samsung Nexus S

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