Positioning method and apparatus
First Claim
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1. A positioning method for a radio system, the method comprising:
- receiving signals at a unit of the system;
applying at least one test on the received signals prior to processing the signals;
wherein applying the test comprises determining whether a signal level of the received signal is above a threshold value;
in accordance with the applied test, selecting one of;
a correlation processing operation and a leading edge processing operation; and
performing the selected one of the correlation processing operation and the leading edge processing operation,wherein applying the test further includes;
in response to the level of the received signal being below the threshold value, selecting the correlation processing operation.
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Abstract
In a GPS or GSM system using DSSS signals, accurate and robust time-of-flight signal processing is achieved by selection of leading-edge or correlation techniques based on a variety of tests and environmental conditions.
21 Citations
11 Claims
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1. A positioning method for a radio system, the method comprising:
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receiving signals at a unit of the system; applying at least one test on the received signals prior to processing the signals; wherein applying the test comprises determining whether a signal level of the received signal is above a threshold value; in accordance with the applied test, selecting one of;
a correlation processing operation and a leading edge processing operation; andperforming the selected one of the correlation processing operation and the leading edge processing operation, wherein applying the test further includes; in response to the level of the received signal being below the threshold value, selecting the correlation processing operation.
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2. A positioning method for a radio system, the method comprising:
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receiving signals at a unit of the system; applying at least one test on the received signals to select a processing operation on the signals, the operation being one of the following;
a correlation processing operation and a leading edge processing operation;wherein the applied test comprises; determining whether a signal level of the received signal is above a threshold value; when the level of the received signal is below the threshold value, selecting the correlation processing operation; when a leading edge gradient is below a gradient threshold value, selecting the leading edge processing operation; and effecting the selected operation. - View Dependent Claims (3)
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4. A positioning method for a radio system, the method comprising:
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receiving signals at a unit of the system; applying at least one test on the received signals prior to processing the signals to select a processing operation on the signals, the operation being one of the following;
a correlation processing operation, and a leading edge processing operation;then effecting the selected operation; and measuring a gradient using the formula;
i=Cdv/DtWhere, V=voltage of a signal waveform, C=capacitance, i=current, and t=time.
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5. A positioning apparatus for a radio system, the apparatus comprising:
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a receiver which receives radio frequency signals which have potentially suffered at least one of noise degradation and multi-path degradation in a propagation environment; testing means for testing the received radio frequency signals, which have not been subject to a correlation processing operation, for at least noise degradation and multi-path degradation and selecting one of; a correlation processing operation and a leading edge processing operation based on the testing; and a processor which subsequently processes the tested radiofrequency signals with the selected one of the correlation based processing operation and the leading edge processing operation. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A positioning method for a radio system, the method comprising:
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receiving signals at a unit of the system; applying at least one test on the received signals prior to processing the signals to select between a correlation processing operation and a leading edge processing operation, the test including; determining whether a signal level of the received signal is above a threshold value; in response to the level of the received signal being below the threshold value, selecting the correlation processing operation; when the level of the received signal is above the threshold value, testing whether a leading edge gradient value is above a gradient threshold value; in response to the leading edge gradient value being below the gradient threshold value, selecting the leading edge processing operation; and in response to the leading edge gradient value being above the gradient threshold value, selecting the correlation processing operation.
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Specification