摘要：Secure, reliable position and time information is indispensable for many civil GNSS applications such as guiding aircraft, tracking freight, synchronizing power grids and cellular networks, and time-stamping financial transactions. This article introduces a cooperative signal authentication architecture in which civil GNSS signals, as well as the encrypted military signals on the same frequency, are sampled by a user receiver and several ad-hoc cross-check receivers at the same time. Cross-correlation of these sampled signals are used to authenticate the signal received by the user receiver
