Lunar Navigation Enhanced with GNSS for Earth-Moon Spacecraft

Lunar Navigation Enhanced with GNSS for Earth-Moon Spacecraft
by Simon Mansfield
Sydney, Australia (SPX) Jul 18, 2024

A new study has advanced the navigation of spacecraft between Earth and the Moon using the Global Navigation Satellite System (GNSS). By utilizing an adaptive Kalman filter, the research addresses issues such as weak signals and poor observation conditions near the Moon, significantly enhancing the accuracy and reliability of future space missions.

As lunar exploration accelerates, there is an increasing need for advanced navigation technologies that surpass traditional Earth-based systems. This study tackles the challenge of weak GNSS signals and spacecraft maneuvers in the lunar environment, highlighting the necessity for sophisticated integrated navigation systems. By combining GNSS, Inertial Navigation System (INS), and star trackers, the research offers improved accuracy and stability in space navigation, which is critical for the success of future space missions.

Researchers from Shandong University, in collaboration with the Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, published their findings (DOI: 10.1186/s43020-024-00140-x) in the journal Satellite Navigation on July 01, 2024. The study presents an adaptive Kalman filter to boost GNSS performance for spacecraft operating in the Earth-Moon space.

The adaptive algorithm introduced in this study significantly enhances the accuracy of spacecraft navigating the challenging Earth-Moon space using GNSS signals. Simulation results show remarkable improvements in navigation precision, with position and velocity accuracies reaching less than 50 meters and 0.2 m/s near the Moon, respectively. By employing the Carrier-to-Noise ratio (C/N0) and innovation vectors, the algorithm effectively mitigates GNSS signal degradation. The integration of GNSS with INS and star trackers compensates for dynamic model instabilities, ensuring highly reliable and precise navigation. This development marks a major advancement in autonomous navigation, essential for the success of future lunar and deep space missions.

Dr. Tianhe Xu, a leading space science researcher, emphasized the impact of this study: "Integrating GNSS, INS, and star trackers marks a significant advancement in autonomous space navigation. This approach not only enhances precision but also fortifies the robustness of spacecraft operations in deep space, heralding new possibilities for future interstellar missions."

This technology has the potential to revolutionize space travel, offering more dependable and precise navigation methods for lunar and interstellar missions. It is poised to support upcoming lunar projects and deep space explorations, providing robust autonomous navigation capabilities designed to meet the unique challenges of space environments.

Research Report:Navigation performance analysis of Earth-Moon spacecraft using GNSS, INS, and star tracker