Phonesat

Phonesat. A series of pioneering CubeSat missions developed by NASA's Ames Research Center to demonstrate the use of commercial smartphone technology as the primary avionics system for a satellite. Launched between 2013 and 2014, these low-cost spacecraft aimed to prove that sophisticated, mass-produced consumer electronics could survive and operate in the harsh environment of low Earth orbit. The project significantly advanced the concept of spacecraft miniaturization and helped lower the barrier to entry for space exploration.

Overview

The Phonesat project emerged during a period of rapid innovation in the CubeSat and NewSpace sectors, driven by goals to drastically reduce space mission costs. Initiated by engineers at NASA Ames Research Center, the core premise was to utilize the advanced computing power, sensors, and cameras of commercial smartphones, like the Google Nexus One and Samsung Nexus S, as the main flight computer. This approach bypassed the need for expensive, radiation-hardened space-grade components traditionally used in satellites like the Hubble Space Telescope. The program was managed under the NASA Office of the Chief Technologist and aligned with broader initiatives such as the Small Spacecraft Technology Program.

Development and Design

Development was led by a team at NASA Ames Research Center, including key engineers who had worked on prior NASA missions like the Lunar Atmosphere and Dust Environment Explorer. The design centered on a standard 1U CubeSat structure, where a commercial smartphone was integrated as the satellite's brain. The Google Nexus One (used in Phonesat 1.0) and Samsung Nexus S (used in Phonesat 2.0) provided the main processor, gyroscope, accelerometer, and high-resolution camera. The satellite bus, built from readily available commercial off-the-shelf components, included external solar cells, a beacon radio system, and a larger external lithium-ion battery to supplement the phone's power. Rigorous testing at facilities like the Ames thermal vacuum chamber validated the design's resilience to space environment stresses.

Missions and Operations

The first missions, Phonesat 1.0a and 1.0b (also called Alexander and Graham), launched on the maiden flight of the Orbital Sciences Corporation Antares rocket from the Mid-Atlantic Regional Spaceport in April 2013. They demonstrated basic "beacon" operations, transmitting health data via radio amateur frequencies. The more advanced Phonesat 2.0 (Bell) launched on the SpaceX Falcon 9 in November 2013 and was deployed from the International Space Station via the Nanoracks CubeSat deployer. It tested a two-way S-band radio, used its phone's camera to image Earth, and employed a novel reaction wheel system for attitude control. All satellites operated successfully for their planned 7 to 14-day missions before re-entering the Earth's atmosphere.

Impact and Legacy

The Phonesat project proved that consumer smartphone technology could reliably function in space, validating a disruptive approach to satellite design. Its success directly influenced subsequent NASA missions, including the Nodes cubesat network and elements of the MarCO Mars flyby cubesats. The open-source nature of much of its design and software, shared through platforms like GitHub, empowered a global community of citizen scientists, university teams, and commercial entities like Planet Labs. It stands as a landmark in the small satellite revolution, demonstrating rapid, low-cost technology demonstration and contributing to the proliferation of CubeSat applications in Earth observation and deep space exploration.

Technical Specifications

The Phonesat series adhered to the 1U CubeSat standard, measuring 10x10x10 cm. Phonesat 1.0 utilized the Google Nexus One smartphone with a 1 GHz Qualcomm Snapdragon processor, 512 MB RAM, and a 5-megapixel camera. Phonesat 2.0 upgraded to the Samsung Nexus S with a 1 GHz ARM Cortex-A8 CPU, 16 GB storage, and added a Sierra Wireless S-band transceiver. Power was provided by body-mounted triple-junction solar cells charging a 5-watt-hour external lithium-ion battery. Attitude determination used the phone's internal MEMS gyroscope and magnetometer, while Phonesat 2.0 incorporated three reaction wheels for active control. Communication for 1.0 was via a simple 437 MHz radio amateur beacon, while 2.0 used both the beacon and a 2.4 GHz S-band link for faster data downlink.

Category:NASA spacecraft Category:CubeSats Category:Technology demonstration satellites Category:Spacecraft launched in 2013 Category:Spacecraft launched in 2014