Method and system for processing positioning signals based on predetermined message data segment
First Claim
Patent Images
1. A method for processing positioning signals in a ranging receiver using predetermined message data bit sequences, comprising:
- collecting signal samples from positioning signals received at the ranging receiver from a plurality of transmitters, the signal samples comprising message data modulation, each transmitter having an associated identification code;
selecting a pre-determined carrier frequency offset (CFO) from a plurality of CFOs;
designating an epoch of a signal sample as a first epoch of a predetermined message data segment, contained within the sample;
compensating the signal sample for the selected CFO;
removing the message data modulation from the signal sample;
determining whether an adequate correlation peak exists for the designated epoch; and
when an adequate correlation peak exists, determining a time-of-arrival for the predetermined message data segment at the ranging receiver based on the adequate correlation peak.
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Abstract
A method and system for determining a geolocation of an object includes collecting a positioning signal including a predetermined message data segment. A time of arrival of the predetermined message data segment may be determined in the positioning signal. Information based on the time of arrival may be provided for determination of a geolocation of an object. The time of arrival of the predetermined message data segment may be determined based on a time search for the predetermined message data segment in the positioning signal.
115 Citations
36 Claims
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1. A method for processing positioning signals in a ranging receiver using predetermined message data bit sequences, comprising:
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collecting signal samples from positioning signals received at the ranging receiver from a plurality of transmitters, the signal samples comprising message data modulation, each transmitter having an associated identification code;
selecting a pre-determined carrier frequency offset (CFO) from a plurality of CFOs;
designating an epoch of a signal sample as a first epoch of a predetermined message data segment, contained within the sample;
compensating the signal sample for the selected CFO;
removing the message data modulation from the signal sample;
determining whether an adequate correlation peak exists for the designated epoch; and
when an adequate correlation peak exists, determining a time-of-arrival for the predetermined message data segment at the ranging receiver based on the adequate correlation peak. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for determining a geolocation of an object, comprising:
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collecting a positioning signal including a predetermined message data segment;
determining a time of arrival of the predetermined message data segment in the positioning signal; and
providing information based on the time of arrival for determination of a geolocation of the object. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A method for processing positioning signals, comprising:
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collecting positioning signals including multi-bit epoch sequences;
integrating the multi-bit epoch sequences to generate an integration sum; and
subsequently correlating the integration sum to generate a time sequence for geolocation determination of the object. - View Dependent Claims (34)
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35. A system for determining a geolocation of an object, comprising:
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logic encoded in media; and
the logic operable to collect a positioning signal including a predetermined message data segment, to determine a time of arrival of the predetermined message data segment in the positioning signal and to provide information based on the time of arrival for determination of a geolocation of the object.
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36. A system for determining a geolocation of an object, comprising:
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means for collecting a positioning signal including a predetermined message data segment;
means for determining a time of arrival of the predetermined message data segment in the positioning signal; and
means for providing information based on the time of arrival for determination of a geolocation of the object.
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Specification