Resilient despreading of terrestrial navigation signals
OwnerBrian G. Ageeinventor
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Abstract
A method and apparatus resiliently despreads terrestrial navigation signals in which the spreading code duration is equal to an underlying baseband symbol rate, including ground beacons based on civil GNSS waveforms, and malicious spoofers. Symbol-rate synchronous channelizers exploit the baseband symbol rate, and means for blindly and resiliently detecting and determining geo-observables of those signals are described. Disclosed techniques can despread signals in arbitrary multipath, and subject to near-far interference in which the relative strength of the interferer is much higher than the despreading gain of the receiver, including near-far tonal and narrowband co-channel interference.
Claims24
A method performed in a receiver, comprising:
- configuring the receiver to select a despreading gain;
- providing for symbol-rate synchronous channelizing of a received signal that comprises at least two navigation signals, to produce a plurality of frequency channels;
- combining the plurality of frequency channels to produce a combined signal;
- and
- estimating the position of the receiver using the combined signal.
An apparatus, comprising:
- one or more processors;
- memory in electronic communication with the one or more processors;
- and instructions stored in the memory and executable by the one or more processors to:
- configure a receiver to select a despreading gain;
- provide for symbol-rate synchronous channelizing of a received signal that comprises at least two navigation signals, to produce a plurality of frequency channels;
- combine the plurality of frequency channels to produce a combined signal;
- and
- estimate the position of the receiver using the combined signal.
Dependencies are inferred from the claim text.