Method of position determination
AssigneeKoninklijke Philips Electronics N.V.
InventorJosi Rosenfeld
Life of this patent
Estimating the term…
Abstract
A device includes an antenna for receiving an incoming signal. A multiplier multiplies the incoming signal with an output from a carrier generator in order to mix down signal the incoming signal. The output of the multiplier is provided to correlators for sequential correlation with a replica code of the mixed down signal provided from a code generator, in order to produce correlation data including I (imaginary) and Q (real) channels. The correlation data is then passed to a signal processor which adjusts appropriately both the code generator and the carrier generator to provide accurate position measurement in indoor environments with multiple diffuse reflections.
Claims12
A method of position determination in a radio system, the method comprising the acts of:
- multiplying a signal received by a multiplier with a carrier signal from a carrier generator to form a mixed down signal;
- correlating the mixed down signal with a replica signal from a code generator to form a correlated signal;
- processing the correlated signal with an optimization function comprising an exponential term in combination with a second term to form an output signal that provides a position measurement in indoor environments with multiple diffuse reflections;
- and
- feeding back the output signal to control the carrier generator and the code generator for improving accuracy of the position measurement;
- wherein the exponential term is in the form Be−αt and the second term is of the form:
- τ
- o
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- (
- 1
- -
- τ
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- 2
- t
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- .
An apparatus for position determination of a radio system, the apparatus comprising:
- a carrier generator for providing a carrier signal;
- a multiplier for multiplying a received signal with the carrier signal to form a mixed down signal;
- means to correlate the mixed down signal with a replica signal and form a correlated signal;
- a code generator to provide the replica signal;
- and
- means to process the correlated signal with an optimization function comprising an exponential term in combination with a second term to form an output signal that provides a position measurement in indoor environments with multiple diffuse reflections;
- wherein the output signal is fed back to control the carrier generator and the code generator for improving accuracy of the position measurement;
- wherein the exponential term is in the form Be−αt and the second term is of the form:
- τ
- o
-
- (
- 1
- -
- τ
- o
- 2
- t
- 2
-
- )
- .
Dependencies are inferred from the claim text.