Patent US882874A successfully refreshed from Google Patents.
Patent EP0598518A1 successfully refreshed from Google Patents.
EP0598518A1
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EP
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Method of calculating GPS measuring deviation and navigation system using same
Assignee: Pioneer Corp
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Filing: 1993-11-02
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Granted: —
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Expires: 2013-11-02
Abstract
Abstract A navigation system includes: GPS receiving device (4) for receiving satellite information including accuracy information supplied from a plurality of GPS satellites and outputting at least the accuracy information, a measuring position as a receiving point calculated from the satellite information, and a declining rate of measuring accuracy calculated on the basis of the position of the GPS satellites; deviation calculating device (7) for calculating a GPS measuring deviation by using the accuracy information and the declining rate of the measuring accuracy; map information storing device (10) for storing map information including digitalized road information; and current position estimating device (7) for estimating a current position by searching the road information within the radius of the GPS measuring deviation around the measured position.
Inventors
- 👤 Shingo Pioneer Electronic Corporation Kuwahara
- 👤 Satoshi Pioneer Electronic Corporation Odagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:31
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/38; G01S19/39; G01S19/42; G01C; G01C21/00; G01C21/26; G01C21/28; G01C21/30; G01S19/396
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A navigation system characterized in that said navigation system comprising: GPS receiving means (4) for receiving satellite information including accuracy information supplied from a plurality of GPS satellites and outputting at least the accuracy information, a measuring position as a receiving point calculated from the satellite information, and a declining rate of measuring accuracy calculated on the basis of the position of the GPS satellites; deviation calculating means (7) for calculating a GPS measuring deviation by using the accuracy information and the declining rate of the measuring accuracy; map information storing means (10) for storing map information including digitalized road information; and current position estimating means (7) for estimating a current position by searching the road information within the radius of the GPS measuring deviation around the measured position.
Claim 2
Dependent Claim
32 words
A navigation system as claimed in claim 1, characterized in that the navigation system further comprises: deviation storing means (9) for storing the GPS measuring deviation obtained by the deviation calculating means.
Claim 3
Dependent Claim
31 words
A navigation system as claimed in claim 2, characterized in that said stored deviation data is renewed, each time measuring calculation is carried out and the GPS measuring deviation is renewed.
Claim 4
Dependent Claim
100 words
A navigation system as claimed in claim 3, characterized in that the navigation system further comprises: measuring dimension detecting means (7) for detecting whether the measuring dimension is two or three, and wherein if the three dimension measuring is detected, said deviation calculating means calculates the GPS measuring deviation according to the following equation: L = PDOP · Σ (URAi) ² ( i +1 to4 ) wherein PDOP is the declining rate of the measuring accuracy on three dimensional measuring and the values of URAi (i = 1 to 4, i : integer) are each accuracy information of four satellites.
Claim 5
Dependent Claim
102 words
A navigation system as claimed in claim 3, characterized in that the navigation system further comprises: measuring dimension detecting means for detecting whether the measuring dimension is two or three, and wherein if the two dimension measuring is detected, said deviation calculating means calculates the GPS measuring deviation according to the following equation: L = HDOP · Σ(URAi) ² ( i =1 to4 ) wherein PDOP is the declining rate of the measuring accuracy on two dimensional measuring and the values of URAi (i = 1 to 4, i : integer) are each accuracy information of three satellites and the maximum thereof.
Claim 6
Independent Claim
106 words
A method of calculating GPS measuring deviation obtained by a deviation calculating device which calculates the GPS measuring deviation from accuracy information and a declining rate of measuring accuracy, characterized in that the method comprising steps of: detecting whether GPS satellite information is obtained or not; obtaining accuracy information of each captured satellites; obtaining a declining rate of measuring accuracy; detecting whether a measuring dimension is two or three; obtaining a maximum URA value of those of three satellites and using the maximum URA value as the satellites, if the two measuring dimension is detected; calculating a GPS measuring deviation; and storing the GPS measuring deviation.
Claim 7
Dependent Claim
71 words
A method according to claim 6, characterized in that if the three dimension measuring is detected, the GPS measuring deviation is calculated according to the following equation: L = PDOP · Σ (URAi) ² ( i =1 to4 ) wherein PDOP is the declining rate of the measuring accuracy on three dimensional measuring and the values of URAi (i = 1 to 4, integer) are each accuracy information of four satellites.
Claim 8
Dependent Claim
75 words
A method according to claim 6, characterized in that if the two dimension measuring is detected, the GPS measuring deviation is calculated according to the following equation: L = HDOP · Σ (URAi) ² ( i= 1 to4 ) wherein PDOP is the declining rate of the measuring accuracy on two dimensional measuring and the values of URAi (i = 1 to 4, integer) are each accuracy information of three satellites and the maximum thereof.
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JPH01109276A
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JPH03291583A
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