[특허]Mobile communication apparatus and position detection method thereof

Pioneer Corporation

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Mobile communication apparatus and position detection method thereof

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-005/14
미국특허분류(USC)	342/357.02; 342/357.1; 342/464
출원번호	US-0125526 (2002-04-19)
우선권정보	JP-0123203 (2001-04-20)
발명자 / 주소	Shioda, Takehiko Nohara, Manabu
출원인 / 주소	Pioneer Corporation
대리인 / 주소	Sughrue Mion, PLLC
인용정보	피인용 횟수 : 8 인용 특허 : 8

초록
▼

When position measurement accuracy of the present position which the base station distance and position measurement part measures from radio waves coming from base stations is not good, a GPS distance and position measurement part measures the present position from radio waves coming from GPS satellites. When position measurement accuracy of the present position obtained by the GPS distance and position measurement part is not good, a position measurement accuracy analysis part compounds the present position obtained by the base station distance and position measurement part with the present position obtained by the GPS distance and position measurement part, and calculates a new position within a range of overlap between a position measurement error of the present position obtained by the base station distance and position measurement part and a position measurement error of the present position obtained by the GPS distance and position measurement part.

대표
청구항
▼

1. A mobile communication apparatus comprising:a base station distance and position measurement part which measures first propagation distances of radio waves coming from base stations and measures a first present position of the mobile communication apparatus from the first propagation distances;a GPS distance and position measurement part which measures second propagation distances of radio waves coming from GPS satellites and measures a second present position of the mobile communication apparatus from second propagation distances; anda position measurement accuracy analysis part which decides one of the first present position and the second present position to be a true present position of the mobile communication apparatus,wherein the base station distance and position measurement part decides a first position measurement error of the first present position, wherein the first position measurement error is decided using measurement results of the first propagation distances of radio waves coming from the base stations and the first present position of the mobile communication apparatus, such that the first position measurement error is decided independent of the radio waves coming from the GPS satellites;the position measurement accuracy analysis part compares the first position measurement error of the first present position with a first predetermined criterion; andwhen the position measurement accuracy analysis part decides that the first position measurement error exceeds the first predetermined criterion, the GPS distance and position measurement part measures the second propagation distances and the second present position; andthe position measurement accuracy analysis part decides that the second present position is adopted as the true present position of the mobile communication apparatus. 2. The mobile communication apparatus as defined in claim 1, wherein the GPS distance and position measurement part decides the second position measurement error of the second present position;the position measurement accuracy analysis part compares the second position measurement error with a second predetermined criterion;when the position measurement accuracy analysis part decides that the second position measurement error exceeds the second predetermined criterion, the position measurement accuracy analysis part calculates a third present position within a range of overlap between the first position measurement error and the second position, measurement error; andthe position measurement accuracy analysis part decides that the third present position is adopted as the true present position of the mobile communication apparatus. 3. The mobile communication apparatus as defined in claim 1, further comprises a controller which stops an operation of the GPS distance and position measurement part at the time of the distance measurement and position measurement by the base station distance and position measurement part. 4. The mobile communication apparatus as defined in claim 2, further comprises a controller which stops an operation of the GPS distance and position measurement part at the time of the distance measurement and position measurement by the base station distance and position measurement part. 5. A position detection method for detecting a position of a mobile communication apparatus, comprising the steps of:measuring a first present position of the mobile communication apparatus from radio waves coming from base stations and a first position measurement error;comparing the first position measurement error with a first predetermined criterion; andmeasuring a second present position of the mobile communication apparatus from radio waves coming from GPS satellites when the first position measurement error exceeds the first predetermined criterion,wherein the first position measurement error is decided using measurement results of first propagation distances of radio waves coming from the base stations and the first presen t position of the mobile communication apparatus, such that the first position measurement error is decided independent of the radio waves coming from the GPS satellites. 6. The position detection method as defined in claim 5, further comprising:measuring a second position measurement error; andcomparing the second position measurement error with a second predetermined criterion; andcalculating a third present position within a range of overlap between the first position measurement error and the second position measurement error when the second position measurement error exceeds the second predetermined criterion. 7. A mobile communication apparatus comprising:a first receiver which receives first radio waves coming from base stations;a second receiver which receives second radio waves coming from GPS satellites;a first calculator which calculates a first position of the mobile communication apparatus and a first error of the first position from the first radio waves, wherein the first error of the first position is decided using measurement results of first propagation distances of the first radio waves coming from the base stations and the first position of the mobile communication apparatus, such that the first error of the first position is decided independent of the second radio waves comma from the GPS satellites;an analyzer which compares the first error with a first predetermined criterion; anda second calculator which calculates a second position of the mobile communication apparatus and a second error of the second position from the second radio waves,wherein the analyzer decides the second present position to be a true present position of the mobile communication apparatus. 8. The mobile communication apparatus as defined in claim 7, wherein the second calculator is turned on to calculate the second propagation distances and the second position when the analyzer determines that the first error exceeds the first predetermined criterion. 9. The mobile communication apparatus as defined in claim 7, wherein the analyzer calculates the third position when the analyzer compares the second error with a second predetermined criterion and decides that the second error exceeds the second predetermined criterion; andthe analyzer decides the third position to be the true present position of the mobile communication apparatus. 10. The mobile communication apparatus as defined in claim 9, wherein the analyzer calculates a third position within a range of overlap between the first error and the second error. 11. A mobile communication apparatus comprising:a first receiver which receives first radio waves coming from base stations;a second receiver which receives second radio waves coming from GPS satellites;a first calculator which calculates a first position of the mobile communication apparatus and a first error of the first position based on the first radio waves, wherein the first error of the first position is decided using measurement results of first propagation distances of the first radio waves coming from the base stations and the first position of the mobile communication apparatus, such that the first error of the first position is decided independent of the second radio waves coming from the GPS satellites; anda second calculator which calculates a second position of the mobile communication apparatus and a second error of the second position based on the second radio waves,wherein an analyzer calculates a third position based on the first position including first error and the second position including a second error, and decides the third position to be a true present position of the mobile communication apparatus. 12. The mobile communication apparatus as defined in claim 11, wherein the analyzer calculates the third position within a range of overlap between the first error and the second error.

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특허 상세정보

Mobile communication apparatus and position detection method thereof

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특허 상세정보

Mobile communication apparatus and position detection method thereof

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이 특허에 인용된 특허 (8)

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IPC 상세정보(version : 201201)

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