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US 12,181,557 B2Granted
Low-frequency radio navigation system
AssigneeArbiter Systems, Incorporated
InventorWilliam J. Dickerson
Life of this patent
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AssigneeArbiter Systems, Incorporated
InventorWilliam J. Dickerson
Estimating the term…
Systems and methods for a low-frequency radio navigation system are described. The system may include a transmitter comprising a base coded modulator configured to generate a base modulation and a data coded modulator configured to generate a data modulation; wherein the transmitter radiates a continuous, constant-power chirped-FM spread spectrum signal, comprising: the base modulation; and the data modulation, wherein the data modulation is orthogonal to the base modulation. The system may also include a receiver comprising a digital signal processor, wherein at least one matched filter coupled to the digital signal processor, the at least one matched filter configured to decode said base modulation and data-encoded modulation and provide a correlation function for received signals received from at least three geographically-spaced transmitters.
A low-frequency radio navigation system comprising:
A method for determining a voltage step timing in a direct digital stepped synthesizer in a transmitter, comprising:
An apparatus for determining a voltage step timing in a direct digital stepped synthesizer in a transmitter, comprising:
A non-transitory computer readable medium storing code for determining a voltage step timing in a direct digital stepped synthesizer in a transmitter, the code comprising instructions executable by a processor to:
A method for estimating signal corrections, comprising:
An apparatus for estimating signal corrections, comprising:
A non-transitory computer readable medium storing code for estimating signal corrections, the code comprising instructions executable by a processor to:
Dependencies are inferred from the claim text.