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EP0083480A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Receivers for navigation satellite systems

Assignee: UK Secretary of State for Defence
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Filing: 1982-12-10
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Granted: —
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Expires: 2002-12-10
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Abstract

Abstract The present invention provides a receiver for a navigation satellite system such as NAVSTAR, which includes an antenna (1) for receiving an incoming coded, time-based, spread spectrum signal which includes navigational data from a plurality, P, of satellites, means (23) for deriving baseband I and Q components of each of the signals, means (10, 11) for digitising the I and Q components, a Fast Fourier Transform (FFT) processor (13) for transforming the digitised I and Q components and their respective codes, and means (15a to 15d) arranged to multiply together the transformed components and codes derived for each of the P satellite signals and to inverse transform the signals and to then determine correlation peaks in the inverse transformed signals.

Inventors

  • 👤 John Kilvington

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 11:36
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/24; G01S19/30

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 89 words
A receiver for a navigation satellite system comprising an antenna for receiving an incoming coded, time-based, spread- spectrum signal which includes navigational data from a plurality, P, of satellites, and means for convolving a segment of the signal with its code by Fourier transforming the segment, multiplying the transform point by point with the segment to give a resultant signal and inverse transforming the resultant signal to produce a correlation peak at a point having a position which gives the relative shift between the incoming signal and the code.
Claim 2
Dependent Claim 89 words
A receiver for a navigation satellite system comprising an antenna for receiving an incoming coded, time-based, spread- spectrum signal which includes navigational data from a plurality, P, of satellites, and means for convolving a segment of the signal with its code by Fourier transforming the segment, multiplying the transform point by point with the segment to give a resultant signal and inverse transforming the resultant signal to produce a correlation peak at a point having a position which gives the relative shift between the incoming signal and the code.
Claim 3
Dependent Claim 93 words
A receiver as claimed in claim 1 wherein said means for convolving a segment of the signal with its code includes means for deriving baseband I and Q components of each of the signals, means for digitising the I and g components, a Fast Fourier Transform (FFT) processor for transforming the digitised I and Q components and their respective codes, multiplier means arranged to multiply together the transformed components and codes derived for each of the P satellite signals, an inverse FFT processor arranged to inverse transform the signals from the multiplier means.
Claim 4
Dependent Claim 20 words
A receiver as claimed in claim 2 further including scanning means for determining correlation peaks in the inverse transformed signals.
Claim 5
Dependent Claim 11 words
A receiver substantially as claimed herein with reference to the drawings.

References Cited (Backward Citations)

US3680105A Cited
US4114155A Cited

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