Guidance and navigation system for an aircraft

Abstract

The present invention relates to a guidance and navigation system for an aircraft, the system comprising: - a GNSS receiver (R) configured to receive GNSS signals, as well as SBAS signals in at least one SBAS service area, these signals comprising GNSS and SBAS messages provided with at least one item of authentication information encrypted by means of a private key, and the receiver (R) comprising a signal processing module (SP) provided with a module (ETM) for extracting and transmitting these messages; and - a device (DD) for extracting the at least one item of authentication information from the messages transmitted by the signal processing module (SP) and for the decryption thereof by means of a public key configured to output at least one item of information on the validity / invalidity of the received messages.

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