What does it take to explore deep space without so much as a single GPS signal and move data at speeds that leave radio in the dust? The U.S. Space Force will soon learn, as its Boeing-developed X‑37B Orbital Test Vehicle gets set to launch on the USSF‑36 mission from Kennedy Space Center. Planned for 11:50 p.m. Eastern, the launch aboard a SpaceX Falcon 9 will send the uncrewed, 29‑foot‑long spaceplane into orbit for a mission whose duration remains classified. The booster, making its sixth flight, will return to Cape Canaveral’s Landing Zone 2 just eight minutes after launch, potentially delivering late‑night sonic booms across Central Florida.
The X‑37B, looking like a miniaturized space shuttle with a 14‑foot wingspan, has accumulated over 4,200 days in orbit over seven flights since 2010. Its size means it can fly within routine rocket fairings, which allows it to be compatible with several launch vehicles, ranging from United Launch Alliance’s Atlas V to SpaceX’s Falcon Heavy. Missions have varied from low‑Earth to highly elliptical orbits, experimenting with everything from Hall-effect thrusters to solar power beaming. The reusability and flexibility of the spacecraft have made it a bright shining spot for Boeing during issues with other programs.
The Space Force has revealed two headline experiments for OTV‑8. The first is a demonstration of high-bandwidth laser communication, aimed at proliferated low-Earth orbit satellite constellations like Starlink. Laser links take advantage of the shorter infrared light wavelength to transfer significantly more data than radio, with less susceptibility to jamming and interception. As Gen. Chance Saltzman, Chief of Space Operations, put it, OTV‑8’s laser communications demonstration will mark an important step in the U.S. Space Force’s ability to leverage proliferated space networks as part of a diversified and redundant space architectures. In so doing, it will strengthen the resilience, reliability, adaptability and data transport speeds of our satellite communications architecture.
Operating these systems in space is no small accomplishment. Low‑Earth orbit satellites move at about 17,000 miles per hour and need to point with precision to set up and sustain optical links. Mechanical vibration, thermal movement, and atmospheric disturbance during downlinks can all interrupt the beam. The X‑37B’s mission is to test if these problems are surmountable in a military setting, enabling secure, high‑capacity inter‑satellite networks.
The second and perhaps more revolutionary payload is advertised as “the highest performing quantum inertial sensor ever tested in space.” Conventional inertial navigation systems rely on accelerometers and gyroscopes to monitor movement, but their accuracy decays with time unless corrected from outside. GPS typically serves that purpose, but GPS signals can be jammed, spoofed, or absent in deep space, underwater, or in wartime. OTV‑8’s quantum inertial sensor utilizes atom interferometry: atoms cooled to close to absolute zero are separated into superposition states, then split into two paths before recombining. Their resulting interference pattern stores tiny changes in rotation and acceleration.
Since atoms are identical and not affected by many of the types of drift that afflict mechanical systems, quantum sensors are capable of sustaining precision over long periods of time without external adjustments. Past missions, like NASA’s Cold Atom Laboratory and the MAIUS‑1 of Germany, have already proven atom interferometry in space but not in the form of a small, mission‑sized navigation system. This flight takes the technology from laboratory physics into working aerospace hardware. Col. Ramsey Horn, Space Delta 9 commander, described it as “a welcome step forward for operational resilience in space,” adding, “Whether navigating beyond Earth-based orbits in cislunar space or operating in GPS-denied environments, quantum inertial sensing allows for robust navigation capabilities when GPS navigation is not possible.”
The potential goes far beyond spacecraft operations. A successful demonstration might empower future lunar or Martian missions with autonomous navigation, unconnected to signals from Earth. On Earth, submarines, aircraft, and surface ships could gain from GPS‑independent location in hot or remote zones. The technology has already demonstrated favor in laboratory tests: in 2024, Boeing and AOSense completed the world’s first in‑flight test of quantum inertial navigation on a crewed aircraft, keeping GPS‑free accuracy for around four hours.
As the countdown continues, the X‑37B awaits on Pad 39A, shrouded in the Falcon 9’s payload fairing. Its service module, deployed for the third time, increases capacity for experiments. Classified aspects of the mission are not revealed, but objectives announced alone extending the envelope of optical communications and quantum navigation portend a great advance in space systems robustness. Whether the spaceplane remains for hundreds or more than 900 days in orbit, its return will most probably have technologies that promise to revolutionize the way spacecraft communicate and navigate back home.
