Autonomous Spacecraft Navigation Based on Pulsar Timing Information

TL;DR

This paper explores an autonomous spacecraft navigation system using pulsar timing data, offering a precise, ground-independent alternative to traditional radio tracking methods, with potential for significant accuracy improvements at large distances.

Contribution

It introduces a novel navigation approach utilizing pulsar signals, achieving autonomous positioning with high accuracy and reducing reliance on ground-based tracking.

Findings

Autonomous navigation accuracy of about 5 km.

Improvement factor of 8 over conventional methods at 10 AU.

Potential for ground-independent spacecraft positioning.

Abstract

We discuss the possibility of an autonomous navigation system for spacecraft that is based on pulsar timing data. Pulsars are rapidly rotating neutron stars that are observable as variable celestial sources of electromagnetic radiation. Their periodic signals have timing stabilities comparable to atomic clocks and provide characteristic temporal signatures that can be used as natural navigation beacons, quite similar to the use of GPS satellites for navigation on Earth. By comparing pulse arrival times measured on-board the spacecraft with predicted pulse arrivals at some reference location, the spacecraft position can be determined autonomously with accuracies on the order of 5 kilometres. For a spacecraft at a distance of 10 astronomical units from Earth (e.g., Earth-Saturn), this means an improvement by a factor of 8 compared to conventional methods. Therefore this new technology is an alternative to standard navigation based on radio tracking by ground stations, without the disadvantages of uncertainty increasing with distance from Earth and the dependence on ground control.