GB2308034A - Detection of spread spectrum signals - Google Patents

Detection of spread spectrum signals

Info

Publication number
GB2308034A
GB2308034A GB9704593A GB9704593A GB2308034A GB 2308034 A GB2308034 A GB 2308034A GB 9704593 A GB9704593 A GB 9704593A GB 9704593 A GB9704593 A GB 9704593A GB 2308034 A GB2308034 A GB 2308034A
Authority
GB
United Kingdom
Prior art keywords
spread spectrum
output
correlation function
produce
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9704593A
Other versions
GB2308034B (en
GB9704593D0 (en
Inventor
Andrew Warren Houghton
Christopher Deal Reeve
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB9419106A external-priority patent/GB9419106D0/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9704593A priority Critical patent/GB2308034B/en
Publication of GB9704593D0 publication Critical patent/GB9704593D0/en
Publication of GB2308034A publication Critical patent/GB2308034A/en
Application granted granted Critical
Publication of GB2308034B publication Critical patent/GB2308034B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/04—Details
    • G01S3/043—Receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

A spread spectrum signal detection system comprising two spatially separated receivers, a correlator, such as a time integrating correlator employing acoustic-optic cells, which is connected to the outputs from the two receivers to produce a signal representative of the cross correlation function of the two spread spectrum signals, a filter arranged to transmit only the central portion of the cross correlation function and a signal processor to produce the cross spectral density and thereby determine the presence of the spread spectrum signal. The direction of arrival of the spread spectrum signal can be determined by measurement of the angle of the phase slope of the cross spectral density. The acoustic-optic cells can be Bragg cells. The output signal from one of the receivers can be applied to a first Bragg cell arranged to point modulate light from a laser light source, the output then being transmitted through a beam expander to a second Bragg cell to which the output signal from the second receiver can be applied, the output from the second Bragg cell then being detected by a photo-detector array. The output from the second Bragg cell can be spatially filtered by providing adjustable imaging optics arranged such that only light corresponding to the central portion of the cross correlation function is transmitted. The processor can be arranged to demodulate the signals to produce data corresponding to the central portion of the cross correlation function and to Fourier transform the data to produce the cross spectral density.
GB9704593A 1994-09-22 1995-09-20 Detection of spread spectrum signals Expired - Fee Related GB2308034B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9704593A GB2308034B (en) 1994-09-22 1995-09-20 Detection of spread spectrum signals

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9419106A GB9419106D0 (en) 1994-09-22 1994-09-22 Detection of spread spectrum signals
PCT/GB1995/002222 WO1996009558A1 (en) 1994-09-22 1995-09-20 Detection of spread spectrum signals
GB9704593A GB2308034B (en) 1994-09-22 1995-09-20 Detection of spread spectrum signals

Publications (3)

Publication Number Publication Date
GB9704593D0 GB9704593D0 (en) 1997-04-23
GB2308034A true GB2308034A (en) 1997-06-11
GB2308034B GB2308034B (en) 1998-02-25

Family

ID=26305668

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9704593A Expired - Fee Related GB2308034B (en) 1994-09-22 1995-09-20 Detection of spread spectrum signals

Country Status (1)

Country Link
GB (1) GB2308034B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6975264B2 (en) 2001-08-08 2005-12-13 Astrium Limited Signal separating system
US7068211B2 (en) 2000-02-08 2006-06-27 Cambridge Consultants Limited Methods and apparatus for obtaining positional information
WO2015126894A1 (en) * 2014-02-18 2015-08-27 Raytheon Company Analog signal processing method for accurate single antenna direction finding
US9485125B2 (en) 2014-06-16 2016-11-01 Raytheon Company Dynamically reconfigurable channelizer
US9590760B2 (en) 2014-06-03 2017-03-07 Raytheon Company Analog RF memory system
US9645972B2 (en) 2014-06-16 2017-05-09 Raytheon Company Butterfly channelizer
US10027026B2 (en) 2014-09-18 2018-07-17 Raytheon Company Programmable beamforming system including element-level analog channelizer
US10084587B1 (en) 2017-07-28 2018-09-25 Raytheon Company Multifunction channelizer/DDC architecture for a digital receiver/exciter
US10348338B2 (en) 2016-10-06 2019-07-09 Raytheon Company Adaptive channelizer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4652817A (en) * 1985-02-14 1987-03-24 Itek Corporation Acousto-optic chip rate detector
US4845502A (en) * 1988-04-07 1989-07-04 Carr James L Direction finding method and apparatus
US4847862A (en) * 1988-04-07 1989-07-11 Trimble Navigation, Ltd. Global positioning system course acquisition code receiver
US5296861A (en) * 1992-11-13 1994-03-22 Trimble Navigation Limited Method and apparatus for maximum likelihood estimation direct integer search in differential carrier phase attitude determination systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4652817A (en) * 1985-02-14 1987-03-24 Itek Corporation Acousto-optic chip rate detector
US4845502A (en) * 1988-04-07 1989-07-04 Carr James L Direction finding method and apparatus
US4847862A (en) * 1988-04-07 1989-07-11 Trimble Navigation, Ltd. Global positioning system course acquisition code receiver
US5296861A (en) * 1992-11-13 1994-03-22 Trimble Navigation Limited Method and apparatus for maximum likelihood estimation direct integer search in differential carrier phase attitude determination systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE Transactions of Microwave Theory and Techniques, June 94 USA vol. 42, no. 6 ISSN 0018-9480 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7068211B2 (en) 2000-02-08 2006-06-27 Cambridge Consultants Limited Methods and apparatus for obtaining positional information
US7227493B2 (en) 2000-02-08 2007-06-05 Cambridge Consultants Limited Methods and apparatus for obtaining positional information
US6975264B2 (en) 2001-08-08 2005-12-13 Astrium Limited Signal separating system
WO2015126894A1 (en) * 2014-02-18 2015-08-27 Raytheon Company Analog signal processing method for accurate single antenna direction finding
US9588213B2 (en) 2014-02-18 2017-03-07 Raytheon Company Analog signal processing method for accurate single antenna direction finding
US9590760B2 (en) 2014-06-03 2017-03-07 Raytheon Company Analog RF memory system
US9485125B2 (en) 2014-06-16 2016-11-01 Raytheon Company Dynamically reconfigurable channelizer
US9645972B2 (en) 2014-06-16 2017-05-09 Raytheon Company Butterfly channelizer
US10027026B2 (en) 2014-09-18 2018-07-17 Raytheon Company Programmable beamforming system including element-level analog channelizer
US10965023B2 (en) 2014-09-18 2021-03-30 Raytheon Company Programmable beamforming system including element-level analog channelizer
US10348338B2 (en) 2016-10-06 2019-07-09 Raytheon Company Adaptive channelizer
US10084587B1 (en) 2017-07-28 2018-09-25 Raytheon Company Multifunction channelizer/DDC architecture for a digital receiver/exciter

Also Published As

Publication number Publication date
GB2308034B (en) 1998-02-25
GB9704593D0 (en) 1997-04-23

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030920