Flight-Ready Precise and Robust Carrier-Phase GNSS Navigation Software for Distributed Space Systems
Samuel Y. W. Low, Toby Bell, Simone D'Amico

TL;DR
This paper develops and tests a high-precision, robust GNSS navigation software for Distributed Space Systems, incorporating advanced filtering, fault detection, and modular design, demonstrated on the VISORS mission.
Contribution
It introduces a comprehensive navigation software architecture with a Consider Kalman Filter, fault detection, and modular design tailored for DSS, validated through extensive testing and real mission data.
Findings
Achieved sub-centimeter relative positioning accuracy.
Demonstrated robustness against measurement anomalies.
Validated software performance on the VISORS mission.
Abstract
This paper presents the full requirements analysis, design, development, and testing of high-precision navigation flight software for Distributed Space Systems (DSS) using Carrier Phase Differential GNSS (CDGNSS). Five main contributions are made. First, a survey of flown and upcoming DSS missions with stringent precision requirements is conducted, from which a thorough requirements analysis is distilled to guide development and testing. Second, a real-time navigation functional architecture is designed, and adopts a sparse and regularized Consider Kalman Filter with options for numerical stability in-flight. The filter rigorously accounts for uncertainties in process noise, measurement noise, and biases. It tracks float ambiguities with integer resolution where possible. The covariance correlation structure is preserved under all navigation modes, including contingencies and outages.…
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