Scientists at the University of Kentucky have developed a technique called Alternating Magnetic Field Forces (AMFF) that allows satellites to communicate and adjust positions using magnetic fields without interfering with others. This method aims to extend mission lifespans by replacing limited propellant fuel with renewable solar power. Tests on Earth demonstrated successful control of three satellites at precise distances.
Satellites typically rely on finite propellant fuel for movement in space, limiting their operational lifespan. To address this, researchers have explored alternatives like Electromagnetic Formation Flying (EMFF), which uses solar-powered electromagnetic coils to generate magnetic fields for maneuvering. However, EMFF faces challenges from magnetic coupling, where a satellite's field affects all nearby objects, complicating control beyond two units.
A new approach, Alternating Magnetic Field Forces (AMFF), tackles this by employing unique interaction frequencies. This enables two satellites to coordinate on one frequency while using different ones for others, preventing unwanted interference. Developed by a team at the University of Kentucky, the concept was tested in a ground-based simulation using three satellites on low-friction linear rails powered by high-pressure air. Equipped with laser ranging modules, the satellites achieved exact positioning as defined by the researchers.
The team did not respond to interview requests. Alvar Saenz Otero from the University of Washington praised the advance, noting, “The complexity of formation flying systems takes a big jump from two units to three units.” Yet he questioned its applicability to low Earth orbit constellations like Starlink, adding, “Everything we ever did for EMFF was always about deep space operations.” Potential interferences from Earth's atmosphere, the moon, and the sun pose further hurdles.
Ray Sedwick from the University of Maryland highlighted scaling issues: “It’s not something that applies at a constellation level.” He suggested superconducting coils could extend range but acknowledged significant technical challenges remain. The research, detailed in a preprint on arXiv (DOI: 10.48550/arXiv.2601.05408), represents progress in sustainable space operations, though large-scale implementation appears distant.