IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0461191
(2003-06-13)
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발명자
/ 주소 |
- Sheynblat, Leonid
- Krasner, Norman F.
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
126 인용 특허 :
35 |
초록
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A method and apparatus for determining a reference time associated with a satellite positioning system. In turn, the reference time, in one embodiment, may be used to determine other navigational information. Such navigational information may include, for example, the location/position of a satellit
A method and apparatus for determining a reference time associated with a satellite positioning system. In turn, the reference time, in one embodiment, may be used to determine other navigational information. Such navigational information may include, for example, the location/position of a satellite positioning system (SPS) receiver. In one embodiment, a relative velocity between an SPS receiver and a set of one or more satellites is used to determine an offset between time as indicated by the SPS receiver and the reference time. According to another embodiment of the invention, an error statistic is used to determine the reference time. According to yet another embodiment of the invention, two records, each representing at least a portion of a satellite message, are compared to determine time. In one implementation, the SPS receiver is mobile and operates in conjunction with a basestation to determine time and/or other navigational information according to one or a combination of the methods described.
대표청구항
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1. A method for determining a reference time associated with a satellite positioning system, said method comprising:estimating a position of an entity relative to a set of satellites, said estimation being associated with a first time measurement, wherein said first time measurement and said referen
1. A method for determining a reference time associated with a satellite positioning system, said method comprising:estimating a position of an entity relative to a set of satellites, said estimation being associated with a first time measurement, wherein said first time measurement and said reference time differ by an offset; determining a relative velocity of said set of satellites; and based on said relative velocity of said set of satellites and said estimated position, determining said offset between said first time measurement and said reference time. 2. The method of claim 1, wherein said entity is a mobile satellite positioning system (SPS) receiver.3. The method of claim 1, further comprising:a remote entity receiving an estimation message from said entity to indicate said estimated position, wherein said remote entity determines said offset using said estimation message. 4. The method of claim 3, further comprising:said remote entity providing navigational information based on said offset to said entity. 5. The method of claim 4, wherein said navigational information comprises said reference time.6. The method of claim 4, wherein said navigational information comprises the location of said entity.7. The method of claim 3, said remote entity performing said determining said relative velocity of said set of satellites.8. The method of claim 1,a remote entity performing said determining said relative velocity of said set of satellites; wherein the method further comprises: said remote entity providing at least one of: said relative velocity and data based on said relative velocity to said entity which comprises an SPS receiver; and wherein said SPS receiver determines navigational information based on said at least one of: said relative velocity and data based on said relative velocity. 9. The method of claim 8, wherein said navigational information comprises said offset.10. The method of claim 8, wherein said navigational information comprises a location of said entity.11. The method of claim 1, wherein said estimated position comprises a pseudorange to said set of satellites.12. The method of claim 1,a remote entity performing said determining said relative velocity of said set of satellites; wherein the method further comprises: said remote entity providing navigational information to said entity, said navigational information being based on said relative velocity of said set of satellites. 13. The method of claim 12, wherein said navigational information comprises said offset.14. The method of claim 12, wherein said navigational information comprises a location of said entity.15. The method of claim 1, further comprising:computing said offset by including said relative velocity of said set of satellites in pseudorange residual computations. 16. The method of claim 15, wherein said relative velocity represents a relative velocity between said entity and said set of satellites.17. The method of claim 15, wherein said relative velocity represents a relative velocity between said entity and a remote entity.18. The method of claim 15, further comprising:iteratively repeating said pseudorange residual computations using a new set of data. 19. The method of claim 18, wherein each one of said repeated pseudorange residual computations provides a correction to said position of said entity and said offset.20. A method for determining a reference time associated with a satellite positioning system, said method comprising:an entity estimating a first value associated with a position of a set of satellites relative to said entity, said estimated first value being associated with a first time measurement, wherein said first time measurement associated with said values and said reference time associated with said satellite positioning system differ by an offset; calculating an error statistic for said first value; and based on said error statistic, determining said offset between said first time measurement and said reference time associated with said satellite positioning system. 21. The method of claim 20, further comprising:iteratively repeating said estimating said first value to obtain a plurality of values and a plurality of time measurements associated therewith; minimizing said error statistic for said plurality of values and said plurality of time measurements; and based on said minimized error statistic, determining said offset. 22. The method of claim 20, wherein said first value comprises a pseudorange residual value, and said error statistic includes a sum of squares of said pseudorange residual value.23. The method of claim 22, wherein said sum of squares of said pseudorange residual value is weighted by a weight factor.24. The method of claim 20, further comprising:determining a location of said entity based on said offset. 25. The method of claim 20, further comprising:using said offset to determine GPS system time; synchronizing said entity to said GPS system time. 26. The method of claim 20,a remote entity performing said determining said error statistic; wherein the method further comprises: said remote entity providing navigational information to said entity, which comprises a satellite positioning system (SPS) receiver. 27. The method of claim 26, wherein said navigational information comprises said offset.28. The method of claim 26, wherein said navigational information comprises information to indicate a location of said SPS receiver.29. An apparatus for determining a reference time associated with a satellite positioning system, said apparatus comprising:a storage unit, to store a set of position values, said position values to indicate a relative position of a set of satellites, and wherein each of said set of position values is associated with a time of measurement that differs from said reference time by an offset; and a processing unit, coupled to said storage unit, to determine said offset based on said set of position values and an estimate of a relative velocity of each of said set of satellites. 30. The apparatus of claim 29, wherein said position values indicate a relative position between said set of satellites and a satellite positioning system (SPS) receiver.31. The apparatus of claim 29, wherein said storage unit and said processing unit are included in a base station, and wherein said basestation further comprises:a communication link to provide navigation information based on said offset to a satellite positioning system (SPS) receiver. 32. The apparatus of claim 31, wherein said navigation information comprises a location of said SPS receiver.33. The apparatus of claim 31, wherein said navigation information comprises said relative velocity of each of said set of satellites.34. The apparatus of claim 31, wherein said navigation information comprises a range between said SPS receiver and each of set of satellites.35. The apparatus of claim 29, further comprising a transmitter, coupled to said processor, to allow transmission of information to an entity.36. The apparatus of claim 35, further comprising a mobile satellite positioning system (SPS) receiver.37. The apparatus of claim 36, wherein said entity comprises a base station to receive said information from said SPS receiver.38. The apparatus of claim 37, wherein said information comprises values related to pseudoranges from said SPS receiver to said set of satellites.39. The apparatus of claim 29, wherein said storage unit and said processing unit are included in a cellular network; and wherein said cellular network includes a base station, and wherein said base station further comprises:a communication link to provide navigation information based on said offset to a satellite positioning system (SPS) receiver. 40. The method of claim 15, wherein said relative velocity represents a relative velocity between said set of satellites and a remote entity.
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