System and method for positioning using hybrid spectral compression and cross correlation signal processing

摘要

The present invention relates to a system and method for positioning and navigation using hybrid spectral compression and cross correlation signal processing of signals of opportunity, which may include Global Navigation Satellite System (GNSS) as well as other wideband energy emissions in GNSS obstructed environments. Examples of these signals of opportunity include but are not limited to GPS, GLONASS, cellular Code Division Multiple Access (CDMA) communications signals, and 802.11 Wi-Fi. Combining spectral compression with spread spectrum cross correlation enables extraction of code and carrier observables without the need to implement the tracking loops (e.g. Costas tracking loop) commonly used in conventional GNSS receivers. For applications where dynamics and transmission medium may make it difficult to continuously track carrier phase, the hybrid approach of the present invention has significant utility.

主权项

1. A system for providing physical state information comprising:
a plurality of ranging signal transmitters (RSTs) that each emit a spread spectrum radio frequency (RF) emission at a corresponding predetermined spread spectrum chipping frequency within a transmission medium, wherein a given RST is designated as a reference spectral compressor and translator (SCT); an interceptor that receives the spread spectrum RF emissions emission propagated through the transmission medium from each of the plurality of RSTs:
a spectral compressor configured to process the intercepted spread spectrum RF emissions using spectral compression utilizing a non-linear operation to produce at set of observables for the plurality of RSTs suitable for physical state estimation;wherein the non-linear operation comprises:
splitting each spread spectrum RF emission into an in-phase component and delayed component;mixing each of the in-phase and delayed components to recover a corresponding predetermined spread spectrum chipping rate;wherein a set of reference observables that characterizes a physical state of the reference SCT is received from the reference SCT; a physical state estimator configured to determine at least one member of the relative physical state between the interceptor and the plurality of RSTs based on the non-linear operations and on the set of reference observables.