Abstract: A system for navigation comprising a network for providing a position, navigation, and timing (PNT) service in which a monitor station collects snapshots from satellite signals with a high gain antenna, and publishes the snapshots and associated data to the network. Reference stations access the published snapshots, calculate a reference time of arrival (TOA) for the signal, and publish the reference TOA to the network. Remote stations access the snapshot and reference TOA information and develop a PNT solution for their location. A method for providing PNT as a service to network subscribers in which monitor stations publish snapshots from signals of opportunity, reference stations publish reference TOAs for the snapshots, and remote stations use the published snapshot and reference TOA information to determine a PNT solution. A method of developing a PNT solution in which a remote station accesses information published to a network to develop a pseudo-range.

Abstract: A circuit is shown which utilizes signals transmitted from global positioning system satellites to create change in phase signals. The change in phase signals are measured over a predetermined time interval, one second, and stored. The stored signals are applied to a Kalman filter and back to the storage unit so that each one second time interval includes the information from all previous time intervals. This accumulated information is referred to as accumulated Delta-Range information which permits a more rapid determination of position by the circuit.