Abstract
The GNSS industry is focusing on potential threats to satellite navigation integrity, such as intentional and unintentional interference, signal-in-space (satellite) and ground support infrastructure anomalies, shared spectrum issues, and multipath. The experience of the International Space Station (ISS program, the Space Shuttle program, the Crew Return Vehicle (CRV) program and) other users of GNSS indicate that navigation outages due to receiver software issues may pose as great a risk, if not more, to the user than threats currently under study. The improvement in GNSS receiver tracking capability and navigation accuracy has been accompanied by an increase in software quantity and complexity. Current and future GNSS receivers will interface with multiple systems that will further increase software complexity. Rather than viewing GNSS receivers as “plug and play” devices, they should be regarded as complex computers that interface with other complex computers, sometimes in safety-critical applications. The high cost of meeting strict software quality standards, and the proprietary nature of GNSS receiver software, makes it more difficult to ensure quality software for safety-critical applications. Lack of integrator and user insight into GNSS software complicates the integration and test process, leading to cost and schedule issues.
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Goodman, J.L. (2003). A Software Perspective on GNSS Receiver Integration and Operation. In: Rycroft, M. (eds) Satellite Navigation Systems. Space Studies, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0401-4_13
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DOI: https://doi.org/10.1007/978-94-017-0401-4_13
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