Abstract: A receiver system is disclosed. The receiver system may include an omnidirectional receiver configured to receive an incoming signal, a directional receiver configured to receive the incoming signal, and an integrity controller. The integrity controller may be configured to determine an integrity of the incoming signal by synchronizing a clock of the omnidirectional receiver and a clock of the directional receiver, receiving an omnidirectional signal of the incoming signal, receiving a directional signal of the incoming signal, translating between a phase of the omnidirectional signal and a phase of the directional signal based on the synchronizing, ensuring a signal equivalency based on the translating, calculating an angle of arrival of the incoming signal based on carrier phase differences associated with the directional signal, and identifying the incoming signal as a trusted satellite signal based on a comparison of the angle of arrival with an expected angle of arrival.

Abstract: A system may include a receiver node. The receiver node may include a communications interface and a controller. The receiver node is time synchronized with a transmitter node to apply Doppler corrections to the receiver node's own motions relative to a common reference frame. The receiver node may be configured to: The receiver node may be configured to: based at least on the receiver node being time synchronized with the transmitter node to apply Doppler corrections and the common reference frame, use Doppler null scanning (DNS) to determine DNS derived information, the DNS derived information including a bearing and the receiver node's relative position relative to the transmitter node; and output a position, navigation, and timing (PNT) solution based at least on the DNS derived information.