Patent US2475481A successfully refreshed from Google Patents.
Patent EP0177203A2 successfully refreshed from Google Patents.
EP0177203A2
Expired / Lapsed
EP
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Radio navigation system
Assignee: Decca Ltd
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Filing: 1985-09-09
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Granted: —
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Expires: 2005-09-09
Abstract
Abstract A phase or time-displacement radionavigation system comprises a terrestrial station (8), satellite stations (10,11) and a mobile receiver (9) which compares signals from the terrestrial station and each satellite to determine respective position lines defining a position fix.
Inventors
- 👤 Stepen Gregory Hazeltine
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:15
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/24; G01S1/30; G01S1/306
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
A radionavigation system wherein, at a receiver, range-difference measurements are made in response to signals received from a terrestrial station and a satellite so as to provide an indication of a position line passing through the location of the receiver.
Claim 2
Dependent Claim
40 words
A radionavigation system wherein, at a receiver, range-difference measurements are made in response to signals received from a terrestrial station and a satellite so as to provide an indication of a position line passing through the location of the receiver.
Claim 3
Dependent Claim
41 words
A radionavigation system according to claim 1, and comprising at least one terrestrial station and at least one earth satellite, the receiver being arranged to make respective range-difference measurements in response to signals received from the terrestrial station and each satellite.
Claim 4
Dependent Claim
53 words
A system according to claim 1 or claim 2 in which the terrestrial station provides one signal and each satellite radiates a signal of defined modulation, the receiver being arranged to convert the modulation into a signal which can be compared with the signal from the terrestrial station to determine the position line.
Claim 5
Dependent Claim
74 words
A receiver for use in a system according to claim 3 and comprising means for receiving a signal from at least one terrestrial station, means for receiving modulated signals from at least one satellite, means for deriving the modulation therefrom, means for converting said modulation into a form where it can be compared with the signal from the terrestrial station, and means for performing the comparison to provide an indication of said position line.
References Cited (Backward Citations)
No citation records indexed.
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