Pulse or digital communications – Repeaters – Testing
Patent
1997-05-23
1999-12-14
Le, Amanda T.
Pulse or digital communications
Repeaters
Testing
375206, 375210, 375343, 327336, H04B 1500
Patent
active
060027088
ABSTRACT:
A network of localizers determines relative locations in three-dimensional space to within 1 cm by cooperatively measuring propagation times of pseudorandom sequences of electromagnetic impulses. Ranging transmissions may include encoded digital information to increase accuracy. The propagation time is determined from a correlator circuit which provides an analog pseudo-autocorrelation function sampled at discrete time bins. The correlator has a number of integrators, each integrator providing a signal proportional to the time integral of the product of the expected pulse sequence delayed by one of the discrete time bins, and the non-delayed received antenna signal. With the impulses organized as doublets the sampled correlator output can vary considerably in shape depending on where the autocorrelation function peak falls in relation to the nearest bin. Using pattern recognition the time of arrival of the received signal can be determined to within a time much smaller than the separation between bins. Because operation of standard CMOS circuitry generates noise over a large frequency range, only low-noise circuitry operates during transmission and reception. To provide the time accuracy necessary for distancing, a high-frequency clock operates during inter-localizer communications. The high-frequency clock uses a phase-lock loop circuit to increase the clock rate and a programmable delay to provide still finer time graduations. A stage in the low-frequency clock uses low-noise circuitry during transmissions and receptions, and standard circuitry at other times.
REFERENCES:
patent: 4357609 (1982-11-01), Spencer
patent: 4374335 (1983-02-01), Fukahori et al.
patent: 4506267 (1985-03-01), Harmuth
patent: 4513285 (1985-04-01), Pike et al.
patent: 4559606 (1985-12-01), Jezo et al.
patent: 4707839 (1987-11-01), Andren e al.
patent: 5003271 (1991-03-01), Swanson
patent: 5072141 (1991-12-01), Eisenbart et al.
patent: 5134408 (1992-07-01), Harmuth
patent: 5179573 (1993-01-01), Paradise
patent: 5184135 (1993-02-01), Paradise
patent: 5216691 (1993-06-01), Kaufmann
patent: 5220332 (1993-06-01), Beckner et al.
patent: 5274271 (1993-12-01), McEwan
patent: 5345471 (1994-09-01), McEwan
patent: 5361070 (1994-11-01), McEwan
patent: 5365516 (1994-11-01), Jandrell
patent: 5408235 (1995-04-01), Doyle et al.
patent: 5432827 (1997-07-01), Mader
patent: 5488662 (1996-01-01), Fox et al.
patent: 5523758 (1996-06-01), Harmuth
patent: 5742635 (1998-04-01), Sanderford, Jr.
"Spread Spectrum Systms," R. C. Dixon, John Wiley and Sons, Second Edition, 1984, chapter 2.
"Frequency-Sharing and Spread-Spectrum Transmission with Large Relative Bandwidth," H. F. Harmuth, IEEE Transactions on Electromagnetic Compatibility, vol. EMC-20, No. 1 Feb. 1978, pp. 232-239.
"An Overview of Impulse Radar Phenomenon," D. L. Black, IEEE AES Systems Magazine, Dec. 1992, pp. 6-11.
"Shift Register Sequences," S. W. Golomb, Aegean Park Press, Laguna Hills, CA, 1982, pp. 2-6 and 24-30.
"New approach to microwave reflectometry: correlation: reflectometry via stochastic noise signals," V. S. Korosteljov, et al., IAEA Technical Meeting on Microwave Reflectometry for Fusion Research, Abingdon, England, Mar. 1992.
"Noise-Modulated Distance Measuring Systems,", B. M. Horton, Proceedings of the I.R.E., May, 1959, pp. 821-828.
"CCD Time-Integrating Correlator," B. E. Burke and D. L. Smythe, Jr., IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 736-744.
"Programmable, Four Channel, 128-Sample, 40-Ms/s Analog-Ternary Correlator," S. C. Munroe, et al., IEEE Journal of Solid-State Circuits, vol. 25, No. 2, Apr. 1990, pp. 425-430.
"CMOS Active Filter Design at Very High Frequencies," Y.-T. Wang and A. A. Abidi, IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, pp. 1562-1574.
"A Ratio-Independent Algorithmic Analog-to-Digital Conversion Technique," P. W. Li, et al., IEEE Journal of Solid-State Circuits, vol. SC-19, No. 6, Dec. 1984, pp. 828-836.
"A BiCMOS Time Interval Digitizer For High-Energy Physics Instrumentation," M. J. Loinaz and B. A. Wooley, IEEE 1993 Custom Integrated Circuits Conference, pp. 28.6.1-28.6.4.
"Charge-Pump Phase-Lock Loops," F. M. Gardener, IEEE Transactions on Communications, vol. Com.-28, No. 11, Nov. 1980, pp. 1849-1858.
"Radiation of Nonsinusodial Electromagnetic Waves," H. F. Harmuth, Academic Press, San Diego, CA, 1990, pp. 36-47.
"DC Motors, Speed Controls, Servo Systems," Electro-Craft Corporation,Hopkins, MN, Third Edition, 1975, pp. 4-31 and 4.32.
"Guide to GPS Positioning," D. Wells, Canadian GPS Associates, Second Printing, 1987, pp. 4.10 to 4.15 and 6.0 to 6.6.
"The GPS message on the hardware platform," P. Mattos, Electronics World+Wireless World, Feb. 1993, pp. 146-151.
"Global Positioning System," Institute of Navigation, Washington. D.C., vol. 1, 1980, pp. 81-86.
Loinaz, et al., A BiCMOS Time Interval Digitizer for High-Energy Physics Instrumentation, IEEE 1993, pp. 28.6-28.6.2.
Harmuth, Radiation of Nonsinusoidal Electromagnetic Waves, Academic Press, Inc., San Diego CA 1990, pp. 36-47.
Wells, et al., Guide to GPS Positioning, Canadian GPS Associates, Second Printing, 1987, pp. 4.10-4.15 and 6.0-6.6.
Burke, et al., A CCD Time-Integrating Correlator, IEEE Jornal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 736-744.
Glazer, GPS Receiver Operation, Institute of navigation, Washington, D.C. vol. 1, 1980, pp. 81-86.
Horton, Noise-Modulated Distance Measuring Systems, Proceedings of the I.R.E., May 1959, pp. 821-828.
Fleming Robert Alan
Kushner Cherie Elaine
Aether Wire & Location, Inc.
Le Amanda T.
LandOfFree
Spread spectrum localizers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spread spectrum localizers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum localizers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-870424