NASA says a spacecraft in its Starling CubeSat swarm has decided its personal orbit with out GPS by observing different satellites and orbital particles, figuring out them in a saved catalogue and treating their predicted positions as reference factors.
The flight experiment, introduced on 17 August 2026, is known as FALCON, quick for Quick Autonomous Misplaced-in-space Catalog-based Optical Navigation. It mixed EraDrive’s Period-Core software program with cameras already carried by the four-spacecraft Starling mission.
NASA calls the self-orbit dedication end result a primary for optical navigation based mostly on a spacecraft’s relative place to different objects in house. That may be a particular first. Spacecraft have navigated with out GPS and used cameras for navigation earlier than.
FALCON turned passing objects into reference factors
Star trackers usually {photograph} stars so a spacecraft can work out which approach it’s pointing. Different spacecraft and particles also can cross the sphere of view. FALCON retained these detections and in contrast them with an onboard catalogue containing the anticipated orbits of about 20,000 identified objects.
Based on NASA’s 17 August mission report, matched objects then acted as optical reference factors for figuring out Starling’s orbit. The system didn’t want a reside GPS repair or a floor operator to inform it the place the observer spacecraft was.
{The catalogue} nonetheless issues. FALCON was not recognising arbitrary items of particles from look alone. It was associating measured instructions with identified objects whose predicted paths had already been established by ground-based monitoring.
That makes “shifting landmarks” a helpful shorthand, however an incomplete one. A landmark is effective as a result of its place is thought. Right here, the identified place is a time-dependent orbital prediction fairly than a hard and fast level on a floor.
A shifting landmark requires orbital arithmetic
A mountain stays fastened on a map. A satellite tv for pc doesn’t. FALCON has to propagate catalogue orbits ahead in time, predict which objects must be seen, match measured instructions to believable identities and use the altering geometry to estimate the observer’s personal place and velocity.
The Stanford Space Rendezvous Laboratory’s project description says the cameras measure bearing angles to seen resident house objects. As soon as a detection is matched to an id, its catalogue orbit provides geometric data for the observer’s place resolution.
A 2025 FALCON technical preprint describes batch and sequential orbit-determination strategies. In simulation, the prototype recovered a misplaced observer’s orbit in lower than one revolution with sub-kilometre accuracy when appropriate reference objects had been obtainable.
The brand new NASA announcement establishes that the tactic labored in orbit. It doesn’t publish a numerical error for Starling’s self-position estimate, so the sooner simulated accuracy shouldn’t be offered because the measured flight end result.
The primary-of-its-kind declare is slender
FALCON isn’t the primary spacecraft to function with out GPS, nor the primary to make use of optical navigation. Deep-space probes have lengthy taken photos of planets, moons and stars to refine their trajectories. The novelty NASA identifies is self-orbit dedication from the relative positions of different human-made objects seen by an optical digicam.
SpaceDaily lately reported how Perseverance now matches surface panoramas to orbital maps to find itself on Mars. Each programs transfer localisation work onto the automobile, however their landmarks differ. Perseverance recognises terrain fastened to a planetary floor; FALCON makes use of objects following separate orbits.
The excellence issues when projecting the end result past Earth. The Starling flight demonstrated one navigation structure in low-Earth orbit, the place a dense, mature catalogue already exists. It didn’t display the identical system working across the Moon or Mars.
The identical observations improved {the catalogue}
NASA additionally examined the method in reverse. As soon as Starling had noticed and recognized surrounding objects, these measurements had been used to refine their predicted paths. Over three days, FALCON improved orbit estimates for greater than 200 objects with out floor intervention, NASA says.
This doesn’t imply Starling tracked each object within the 20,000-entry onboard catalogue. {The catalogue} provided potential identities and predicted positions. The digicam noticed a a lot smaller subset chosen by geometry, lighting, sensitivity and timing.
Additionally it is solely a part of the orbital inhabitants. SpaceDaily’s recent account of the debris environment notes that about 46,000 objects are actually tracked round Earth, whereas much more smaller fragments stay under routine monitoring thresholds. Variations in catalogue date, entry and inclusion guidelines additionally make 20,000 and 46,000 totally different measures fairly than a contradiction.
Onboard updates may shorten the hole between statement and a revised orbit estimate. Which will enhance visitors consciousness and collision screening, however one optical payload can’t present steady protection of each orbit, and an orbit estimate nonetheless carries uncertainty.
The Moon and Mars case nonetheless wants infrastructure
GPS protection is strongest close to Earth. Across the Moon or Mars, future spacecraft will want different methods to ascertain place with out ready for an entire navigation resolution from Earth. NASA’s Starling mission overview presents autonomous swarms as one potential foundation for navigation companies and distributed science past low-Earth orbit.
FALCON can’t merely carry Earth’s particles catalogue to the Moon and proceed unchanged. A lunar or Martian model would wish its personal helpful inhabitants of identified spacecraft, shared timing and orbit data, enough digicam visibility and a way for conserving the native catalogue correct. A sparse early community could provide fewer helpful sight traces than low-Earth orbit.
Later in 2026, NASA plans to increase the experiment so all 4 Starling spacecraft can share monitoring information and refine their positions collectively. That flight end result will present whether or not one satellite tv for pc’s shifting landmarks can grow to be a sensible navigation community.
