GB2308034A - Detection of spread spectrum signals - Google Patents
Detection of spread spectrum signalsInfo
- 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
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.
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)
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)
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 |
-
1995
- 1995-09-20 GB GB9704593A patent/GB2308034B/en not_active Expired - Fee Related
Patent Citations (4)
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)
Title |
---|
IEEE Transactions of Microwave Theory and Techniques, June 94 USA vol. 42, no. 6 ISSN 0018-9480 * |
Cited By (12)
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 |