# CORTEX framework guides spacecraft docking with 8 mm error on hardware testbed

- Published: 2026-11-07 05:14 UTC
- Section: Sky & Space › Space
- Tags: spacecraft docking, autonomous rendezvous, CORTEX framework, satellite servicing, orbital robotics, space debris mitigation
- URL: https://realtech.media/news/rt-cbaad48e25213a36b78664d5_cortex_framework_guides/

**Researchers presented an autonomous trajectory guidance system that achieved millimeter-level docking accuracy during lab and software tests.**

![CORTEX framework guides spacecraft docking with 8 mm error on hardware testbed](https://realtech.media/media/2026/11/82e95a7519d2698e.jpg)
*NASA, Wikimedia Commons, Public domain*

Aerospace engineers have developed and validated CORTEX (Convex Optimization for Rendezvous Trajectory EXecution), an autonomous guidance framework designed for close-range rendezvous with uncooperative spacecraft, according to a paper published in Acta Astronautica [1]. The system calculates approach trajectories and tracks them under dynamic, actuation, and sensing uncertainties without requiring real-time commands from Earth.

Autonomous rendezvous capabilities are aimed at servicing inactive satellites and managing orbital debris, where communication delays prevent direct ground control [1]. According to European Space Agency estimates cited by the authors, low Earth orbit contains roughly 19,440 satellites, of which 3,540 are non-functioning, along with more than 8,000 metric tons of orbital debris [1]. CORTEX schedules rendezvous operations around illumination conditions, aiming to complete proximity operations during sunlight windows rather than in darkness [1].

## Algorithmic Architecture and Trajectory Replanning

The framework combines a visual perception pipeline with convex-optimization-based trajectory planning and tracking [1]. CORTEX continuously evaluates trajectory deviations against safety constraints. If thruster malfunctions or external perturbations push the spacecraft away from its nominal path, the system either replans a new approach trajectory or executes an abort maneuver, retreating into a passively safe holding orbit to protect the keep-out zone [1].

## Numerical Simulations and Hardware Testing

The engineering team evaluated CORTEX through a two-tier validation program [1]. First, a numerical Monte-Carlo campaign of 500 trials per error regime was executed on a Basilisk-based simulation platform incorporating orbital dynamics, perception, and attitude control [1]. Under the highest simulated error conditions, the software achieved a terminal docking accuracy of 25.99 ± 21.00 mm in relative position and 0.371 ± 0.440 mm/s in relative velocity [1].

Physical validation followed with 18 nominal and off-nominal test runs on a planar air-bearing hardware testbed equipped with cold-gas thrusters and motion-capture feedback [1]. During hardware stress testing involving artificial thruster shutdowns and manual perturbations, the spacecraft achieved terminal errors of 8.09 ± 5.29 mm in relative position and 2.23 ± 1.72 mm/s in relative velocity [1].

## Sources

1. [Acta Astronautica](https://doi.org/10.1016/j.actaastro.2026.08.041)
2. [EurekAlert](https://www.eurekalert.org/news-releases/1150881)

---

Source: RealTech, realtech.media — https://realtech.media/news/rt-cbaad48e25213a36b78664d5_cortex_framework_guides/