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METHOD AND APPARATUS FOR AUTHENTICATING A SATELLITE NAVIGATION SIGNAL USING THE SIGNAL OF THE GALILEO COMMERCIAL SERVICE
METHOD AND APPARATUS FOR AUTHENTICATING A SATELLITE NAVIGATION SIGNAL USING THE SIGNAL OF THE GALILEO COMMERCIAL SERVICE
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机译：利用伽利略商业服务的信号认证卫星导航信号的方法和装置
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摘要
The present invention concerns a method and a system for authenticating an unencrypted satellite navigation signal, containing encoded in it at least one unencrypted channel (E1B), using an encrypted satellite navigation signal (E6B) and an encryption key provided by the operator of the satellite navigation system. The unencrypted satellite navigation signal and the encrypted satellite navigation signal are transmitted by at least one navigation satellite (201). The method foresees to: provide radio means (203, 204, 302, 303) in a first apparatus (208) suitable for receiving such an unencrypted and encrypted satellite navigation signal from at least one navigation satellite (201), the unencrypted and encrypted satellite navigation signal being transmitted by such at least one said navigation satellite (201) at different frequencies (E1/L1, E6); receiving the encrypted satellite navigation signal and the unencrypted signal from at least one navigation satellite (201); carrying out operations of baseband conversion and analogue digital conversion of such unencrypted and encrypted satellite navigation signals (301, 305); digitally processing (306, 309) the unencrypted satellite navigation signal (403, 503) to find at least one component transmitted over an unencrypted channel (E1 B); deriving the transmission time (T0) of such a component of the unencrypted satellite navigation signal, for such an at least one unencrypted channel (E1B), thus found; and generating a replica encrypted satellite navigation signal (401, 501) of the encrypted satellite navigation signal (402, 502) at such a transmission time (T0) thus derived, using the encryption key; checking whether the replica encrypted satellite navigation signal and the encrypted satellite navigation signal are substantially correlated to one another (707); and providing in output the result of such a checking operation.
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