Pseudorandom noise ranging receiver which compensates for multip

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

375209, 375367, 380 46, H04B 169, H04L 2730

Patent

active

058090649

ABSTRACT:
A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The autocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. The time delay spacing between the (early, late), and (punctual, early-minus-late) correlation signals are dynamically adjusted, such that in an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time; once PRN code lock is achieved, the code delay spacing is narrowed to a fraction of a PRN code chip time.

REFERENCES:
patent: 4203070 (1980-05-01), Bowles et al.
patent: 4426712 (1984-01-01), Gorski-Popiel
patent: 4457006 (1984-06-01), Maine
patent: 4530103 (1985-07-01), Mosley, Jr. et al.
patent: 4611333 (1986-09-01), McCallister et al.
patent: 4754465 (1988-06-01), Trimble
patent: 4785463 (1988-11-01), Janc et al.
patent: 4791378 (1988-12-01), Waltham
patent: 4800577 (1989-01-01), Tachita et al.
patent: 4807256 (1989-02-01), Holmes et al.
patent: 4821294 (1989-04-01), Thomas, Jr.
patent: 4847862 (1989-07-01), Braisted et al.
patent: 4894842 (1990-01-01), Broekhoven et al.
patent: 4932036 (1990-06-01), Goradia et al.
patent: 5016257 (1991-05-01), Wolf et al.
patent: 5495499 (1996-02-01), Fenton et al.
Langley, R.B., "Why is the GPS Signal So Complex?", GPS World, May/Jun. 1990, pp. 56-59.
Article entitled Proceedings of the Satellite Division International Technical Meeting, Sep. 19-23, 1988.
Hagerman, L.L., "Effects of Multipath on Coherent and Non-Coherent Ranging Receivers", The Aerospace Corporation Report No. TOR-0073 (3020-03)-3, 15 May 1973.
Dr. C.R. Cahn, "Spread Spectrum Applications and State-of-the Art Equipment", Magnavox Communications and Navigation, Nov. 22, 1972.
L.A.A. Al-Rawas and R.F. Ormondroyd, "Novel Delay-Lock-Loop Implementation for Reduced Acquisition Time of PN Sequences", Nov. 1983.
R.F. Ormondroyd, et al., "An Improved Delay Lock Loop For Use In Ranging and Data Modulated Spread-Spectrum Systems", IEEE Proceedings, vol. 132, No. 6, Dec. 1985, pp. 291-300.
Walter J. Gill, A Comparison of Binary Delay-Lock Tracking Loop Implementations, IEEE Transactions on Aerospace and Electronic Systems, vol. AES-2, No. 4, Jul., 1966, pp. 415-423.
Digital Communication and Spread Spectrum Systems, by Roger E. Ziemer and Roger L. Peterson, Ch. 9, pp. 419-447, copyright 1985.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Pseudorandom noise ranging receiver which compensates for multip does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pseudorandom noise ranging receiver which compensates for multip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pseudorandom noise ranging receiver which compensates for multip will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-96612

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.