Robust Low-Frequency Spread-Spectrum Navigation System
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Accused Products
Abstract
Methods and apparatus are described for a navigation system. A process includes providing a plurality of transmitters distributed throughout a desired coverage area; locking the plurality of transmitters to a common timing reference; transmitting a signal from each of the plurality of transmitters. An apparatus includes a plurality of transmitters distributed throughout a desired coverage area; wherein each of the plurality of transmitters comprises a packet generator; and wherein the plurality of transmitters are locked to a common timing reference.
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Citations
42 Claims
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1-27. -27. (canceled)
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28. A radiolocation transmitter, comprising:
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a packet generator configured to generate radiolocation data; a pseudo-noise (PN) code generator configured to generate a PN code; a radiolocation signal generator coupled to the packet generator and the PN code generator, where the radiolocation signal generator is configured to process the PN code and the radiolocation data to generate a spread-spectrum radiolocation signal; and an output component configured to transmit the spread-spectrum radiolocation signal as a ground-wave or sky-wave signal. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A radiolocation transmitter, comprising:
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a packet generator configured to generate radiolocation data; a pseudo-noise (PN) code generator configured to generate a PN code; a radiolocation signal generator coupled to the packet generator and the PN code generator, where the radiolocation signal generator is programmed to process the PN code and the radiolocation data to generate a hybrid spread spectrum waveform that combines direct sequence modulation with a frequency hopping, a time hopping, or a time gating protocol; and an output component configured to transmit the hybrid spread-spectrum waveform as a radiolocation signal. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification