EP0508405A1
Expired / Lapsed
EP
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System for measuring position by using global positioning system and receiver for global positioning system
Assignee: Sharp Corp
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Filing: 1992-04-08
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Granted: —
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Expires: 2012-04-08
Abstract
Abstract A GPS position measuring system includes at least one mobile station and a base station associated with the mobile station. The mobile station is provided with an antenna (30) for receiving one or more GPS signals from the corresponding GPS satellites, an amplifying and frequency converting circuit (31) for amplifying the received signal and converting the amplified GPS signal into a signal on an IF band, an analog-to-digital converter (32) for converting the signal on the IF band into a digital signal, and a writing unit (33) for writing the digital signal into a memory card in order to transfer the digital signal to the base station.
Inventors
- 👤 Naoki Okamoto
- 👤 Takeshi Okamoto
- 👤 Masao Miyazaki
- 👤 Tomozo Ohta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:02
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/03; G01S19/09; G07; G07C; G07C5/00; G07C5/008; G07C5/08; G07C5/0841; G07C5/085; G07C5/0858
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A GPS position measuring system having at least one mobile station (27) and a base station (21) associated with said mobile station, characterized in that said mobile station includes: means (30) for receiving a GPS signal from a GPS satellite; means (31) for converting the received GPS signal into a signal on an intermediate-frequency (IF) band; means (32) for converting the analog signal on the IF band into a digital signal; and means (33) for processing the digital signal in order to transfer it to said base station; said base station including: means (34, 35, 36, 37) for deriving a position of said mobile station by using the digital signal transferred from said mobile station to said base station.
Claim 2
Dependent Claim
27 words
A GPS position measuring system according to claim 1, characterized in that said processing means includes means for storing a digital signal converted by said converting means.
Claim 3
Dependent Claim
34 words
A GPS position measuring system according to claim 2, characterized in that said storing means is one of a memory card, an IC card, another type of semiconductor storage device, and a magnetic medium.
Claim 4
Dependent Claim
29 words
A GPS position measuring system according to claim 3, characterized in that said storing means is means for transmitting a digital signal converted by said converting means with wireless.
Claim 5
Dependent Claim
75 words
A mobile station used for GPS position measuring system, characterized in that said mobile station comprises: means (30) for receiving a GPS signal from a GPS satellite; means (31) for converting the received GPS signal into a signal on an intermediate-frequency (IF) band; means (32) for converting the analog signal on the IF band into a digital signal; and means (33) for processing the digital signal in order to transfer it to said base station.
Claim 6
Dependent Claim
25 words
A mobile station according to claim 5, characterized in that said processing means includes means for storing a digital signal converted by said converting means.
Claim 7
Dependent Claim
32 words
A mobile station according to claim 6, characterized in that said storing means is one of a memory card, an IC card, another type of semiconductor storage device, and a magnetic medium.
Claim 8
Dependent Claim
27 words
A mobile station according to claim 7, characterized in that said storing means is means for transmitting a digital signal converted by said converting means with wireless.
Claim 9
Dependent Claim
108 words
A GPS receiver, characterized in that comprises: means (60) for receiving a plurality of GPS (Global Positioning System) signal from a plurality of GPS satellite; means (61) for converting a signal involving the received GPS signals into an IF signal; means (62) for converting the IF analog signal into a digital signal involving a plurality of GPS signal components; means (63,64) for storing the converted digital signal before signal processing with respect to deriving a position of the GPS receiver; means (65) for reading the digital signal from said storing means; and means (66,67) for deriving the position of the GPS receiver by using the read digital signal.
Claim 10
Dependent Claim
38 words
A GPS receiver according to claim 9, characterized in that the digital signal is read out of said storing means at a faster speed than the speed at which the digital signal is written to said storing means.
Claim 11
Dependent Claim
32 words
A GPS receiver according to claim 10, characterized in that said deriving means includes means for sampling a signal of a specified satellite from the read digital signal by said reading means.
References Cited (Backward Citations)
EP0155776A1
Cited
GB2241623A
Cited
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