As made plain in a report published last year by the Royal Academy of Engineering in the UK, all types of global navigation satellite systems (GNSS) are vulnerable to failure, disruption and interference, and much work has been (and is being) done to assess the possible failure modes and their effects on services, and to develop strategies to detect failures and correct them. Many of the potential problems with GNSS relate to the fact that the signals are very weak – typically less than 1....

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