Satellite formation flying

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Satellite formation flying is the concept that multiple satellites can work together in a group to accomplish the objective of one larger, usually more expensive, satellite.[1] Coordinating smaller satellites has many benefits over single satellites including simpler designs, faster build times, cheaper replacement creating higher redundancy, unprecedented high resolution, and the ability to view research targets from multiple angles or at multiple times. These qualities make them ideal for astronomy, communications, meteorology, and environmental uses.[2]

Types of formations[edit]

Landsat-7 being trailed by EO-1 covering the same area at different times

Depending on the application, there are three formations possible: trailing, cluster, and constellation.[1]

  • Trailing formations are formed by multiple satellites orbiting on the same path. They are displaced from each other at a specific distance to produce either varied viewing angles of one target or to view a target at different times. Trailing satellites are especially suited for meteorological and environmental applications such as viewing the progress of a fire, cloud formations, and making 3D views of hurricanes. Notable pairs are Landsat 7 with EO-1, the "A-train" consisting of CALIPSO and CloudSat (among others), and Terra with Aqua.
  • Cluster formations are formed by satellites in a dense (relatively tightly spaced) arrangement. These arrangements are best for high resolution interferometry and making maps of Earth. TechSat-21 was a suggested satellite model capable of operating in clusters.

Usually, these formations are made up of numerous small satellites. A micro satellite weighs under 100kg and a nano satellite weighs under 10kg. Magnetosheric Constellation, for instance, would be composed of 100 micro satellites.(see [1])

This technology has become more viable thanks to the development of autonomous flying. With an on board computer and this algorithm, satellites may autonomously position themselves into a formation. Previously, ground control would have to adjust each satellite to maintain formations. Now, satellites may arrive at and maintain formations with faster response time and have the ability to change the formation for varied resolution of observations. Also, satellites may be launched from different spacecraft and rendezvous on a particular path. This advance was made possible by Dave Folta, John Bristow, and Dave Quinn at NASA’s Goddard Space Flight Center (GSFC).[1]

Cluster formation for the proposed TechSat-21 mission.

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