What if the world’s most sophisticated spaceplane has a navigation system that is not reliant on GPS at all?
Thursday evening late, in weather that improved as Hurricane Erin had moved north into the Atlantic, SpaceX Falcon 9 is scheduled to blast off from Kennedy Space Center’s Launch Complex 39A, carrying the U.S. Space Force’s X‑37B Orbital Test Vehicle on its eighth mission, USSF‑36/OTV‑8. The Boeing-developed, unmanned spaceplane close to nine meters long with a payload bay the width of a pickup truck bed has already spent over 4,208 days in orbit space on past flights. On this flight, it will test two technologies that might change how spacecraft communicate and navigate far from home: a high-bandwidth laser communications system and what the Space Force refers to as “the world’s highest performing quantum inertial sensor ever used in space.”
Col. Ramsey Horn, Space Delta 9 commander, added emphasis to the importance: OTV‑8’s quantum inertial sensor demonstration is a welcome step forward for operational resilience in space. 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 quantum inertial sensor on the X‑37B is based on atom interferometry, a method that cools atoms to the brink of absolute zero so that they exhibit wave-like behavior. Lasers split each atom into a superposition state, directing it down two paths at the same time before recombining them. The interference pattern created encodes incredibly accurate information regarding acceleration and rotation. Unlike traditional inertial navigation systems based on mechanical gyroscopes and accelerometers that can build up drift over time, quantum sensors take advantage of the stable nature of atoms to provide orders of magnitude greater sensitivity and long-term accuracy independent of external references.
The unit is being tested in orbit for use in operations for the first time. Although NASA’s Cold Atom Laboratory and Germany’s MAIUS-1 mission have demonstrated the physics of space, OTV-8’s payload is packaged as a light, ruggedized system that can be used for real-world missions to navigate spacecraft in deep space, submarines underwater, or aircraft through GPS-jammed airspaces. In military situations, where GPS jamming and spoofing are increasingly prevalent, the capability for autonomous navigation could be the deciding factor.
The second large experiment laser communications is aimed at another weak point: the necessity of secure, high-capacity data transmission. With their much shorter wavelength than radio waves, infrared light is used to transmit laser links that can transmit many times more data per second. Their narrow, tightly focused beams are naturally more difficult to intercept or jam. OTV‑8 will demonstrate inter-satellite laser connections with proliferated low-Earth orbit constellations, a capability that, if demonstrated, could provide robust, high-rate communications for military space vehicles from LEO to cislunar space.
The Falcon 9 booster allocated to this mission, B1092, is flying for the sixth time after launching NROL‑69, CRS‑32, GPS III‑7, and several Starlink batches before. It will be landing return-to-launch-site at Landing Zone 2, as part of SpaceX’s plan to reduce recovery until new pads are completed at LC‑39A and SLC‑40. The reuse is in line with the company’s more extensive thrust towards high-cadence, cost-effective launches a model that has allowed missions such as OTV‑8 to take flight on flight-proven hardware.
After achieving orbit presumably a 500‑kilometer, 49.5‑degree inclination the X‑37B would stay airborne for hundreds of days. Its configuration, including a deployable solar array and hypergolic-fueled propulsion for on-orbit maneuvers, is conducive to long, flexible missions. Previous flights have demonstrated technologies from Hall-effect thrusters for secure communication satellites through solar power beaming ideas and even biological experiments for NASA.
Although most of OTV‑8’s manifest is still classified, the reported tests mark a change: from demonstrating fundamental spaceflight durability to launching state-of-the-art systems that might support the next generation of autonomous, robust space operations. To the Space Force, achievement would be navigating and communicating architectures less reliant on susceptible Earth-bound infrastructure. To the aerospace industry, it represents a turning point in transitioning quantum sensing and laser communications from lab demonstrations into the harsh environment of space.
