GENERALIZED HIGH PERFORMANCE NAVIGATION SYSTEM

摘要

A generalized high performance navigation system is provided using low earth orbit (LEO) satellites. In one embodiment, a method of performing navigation includes receiving a LEO signal from a LEO satellite, decoding a navigation signal from the LEO signal, receiving first and second ranging signals from first and second ranging sources, respectively, determining calibration information associated with the first and second ranging sources, and calculating a position using the navigation signal, the first and second ranging signals, and the calibration information. In another embodiment, a method of providing a LEO signal from a LEO satellite includes providing a plurality of transmit channels over a plurality of transmit slots, where the transmit channels comprise a set of communication channels and a set of navigation channels, generating a first pseudo random noise (PRN) ranging overlay corresponding to a navigation signal, applying the first PRN ranging overlay to a first set of the navigation channels, and combining the communication channels and the navigation channels into a LEO signal. The method also includes broadcasting the LEO signal from the LEO satellite. A low earth orbit (LEO) satellite data uplink is also provided. A method includes broadcasting the data uplink signal to the LEO satellite. Various approaches to localized jamming of navigation signals are further provided. Modulated noise signals are broadcast over an area of operations to provide a plurality of jamming bursts corresponding to the navigation signal. The jamming bursts are configured to substantially mask the navigation signal in the area of operations.