Robust Low-Frequency Spread-Spectrum Navigation System
2 Assignments
0 Petitions
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.
36 Citations
46 Claims
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1-27. -27. (canceled)
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28. A method, comprising:
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receiving a plurality of radiolocation signals that have a hybrid spread spectrum waveform that combines direct sequence modulation with a frequency hopping, a time hopping, or a time gating protocol, where the plurality of radiolocation signals share a common timing reference; and determining a location of a receiver based on a reception of the plurality of radiolocation signals. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A method, comprising:
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receiving a ground-wave radiolocation signal at a receiver; receiving a sky-wave radiolocation signal at the receiver; and correlating the ground-wave radiolocation signal with the sky-wave radiolocation signal to determine a three-dimensional location of the receiver based on radiolocation data received from the ground-wave radiolocation signal and radiolocation data received from the sky-wave radiolocation signal. - View Dependent Claims (35, 36, 37)
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38. A method, comprising:
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receiving a ground-wave or a sky-wave spread spectrum radiolocation signal at a receiver; producing a correlation waveform with a series of narrow doublet pulses that correspond to transitions of a pseudorandom code associated with the spread spectrum radiolocation signal; applying the series of narrow doublet pulses to the spread spectrum radiolocation signal to obtain radiolocation information from the spread spectrum radiolocation signal; and determining a location of the receiver based on the radiolocation information. - View Dependent Claims (39, 40, 41, 42)
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43. A method, comprising:
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receiving a plurality of spread spectrum radiolocation signals at a receiver; determining a location of the receiver based on receipt of the plurality of spread spectrum radiolocation signals; and rotating a directional antenna of the receiver to determine a bearing associated with the receiver based on the spread spectrum radiolocation signals. - View Dependent Claims (44, 45, 46)
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Specification