Abstract: Some implementations herein related to an authentication equipment (AE) that receives an in-phase-quadrature phase (I/Q) spectrum recording of a covert data sequence indicative of received spectra of a signal over which an overt data sequence is transmitted and an overt time and position solution. The AE derives from the overt data sequence. indicating a position and a time at which the position was derived. The AE processes the I/Q spectrum recording to derive an independent time and position solution indicating another position where the I/Q spectrum recording was recorded and another time at which the I/Q spectrum was recorded at the another position. The AE determines whether the overt time and position solution and the independent time and position solution are a match. The AE authenticates the overt time and position solution based on the overt time and position solution and the independent time and position solution being a match.

Abstract: A receiver authenticates a wideband (WB) signal from global navigation satellites (GNSS) using a narrowband (NB) signal that is also transmitted from the satellites. The NB signal includes segments that are transmitted in time and frequency slots of successive transmission frames. The NB signal is less susceptible to a smart WB jammer. Also, the NB signal segments may also be transmitted at a relative power level with respect to the WB signal, where the relative power level may vary in a known pattern so as to distinguish the WB signal of the satellite from a stronger WB signal from a smart jammer.

Abstract: A receiver authenticates a wideband (WB) signal from global navigation satellites (GNSS) using a narrowband (NB) signal that is also transmitted from the satellites. The NB signal includes segments that are transmitted in time and frequency slots of successive transmission frames. The NB signal is less susceptible to a smart WB jammer. Also, the NB signal segments may also be transmitted at a relative power level with respect to the WB signal, where the relative power level may vary in a known pattern so as to distinguish the WB signal of the satellite from a stronger WB signal from a smart jammer.