Jeffrey J Jorgensen

US Patent:

6590524, Jul 8, 2003

Filed:

May 10, 2000

Appl. No.:

09/568104

Inventors:

Michael G. Farley - Cedar Rapids IA
Jeffrey J. Jorgensen - Cedar Rapids IA
Jeffrey L. Tuohino - Cedar Rapids IA
Susan R. Schellenberg - Cedar Rapids IA
Wilmer A. Mickelson - Cedar Rapids IA
Mitchell A. Corcoran - Mt. Vernon IA

Assignee:

Rockwell Collins, Inc. - Cedar Rapids IA

International Classification:

G01S 502

US Classification:

34235706, 34235714, 701213

Abstract:

Disclosed is a method which synchronizes a slave time with a master time. The master time is derived from a received signal. The master time is compared to the slave time to detect any offset of the slave time relative to the master time. If an offset is detected, the slave time is adjusted to correct the offset. Also disclosed is a method of synchronizing a pseudolite transmitter time with GNSS time. The transmitter time is compared to GNSS time to detect any offset of the transmitter time. The transmitter time is adjusted to correct the offset if an offset is detected. Also disclosed is an improved pseudolite. The pseudolite has a pseudolite transmitter and GNSS receiver. The pseudolite transmitter time is synchronized with GNSS time.

US Patent:

20010050949, Dec 13, 2001

Filed:

Jul 25, 1997

Appl. No.:

08/901039

Inventors:

CHARLES A. POPECK - CEDAR RAPIDS IA, US
GARY B. GREEN - CEDAR RAPIDS IA, US
JEFFREY L. TUOHINO - CEDAR RAPIDS IA, US
JEFFREY J. JORGENSEN - CEDAR RAPIDS IA, US

International Classification:

H04K001/00

US Classification:

375/148000

Abstract:

A spread-spectrum demodulation system which can separate known incoming broad-band signals from a received signal, allowing separation of interfering signals and acquisition and tracking of multiple signals with widely varying power. Each signal is despread using a locally generated code, and then separated by narrow-band excision. The effect of that locally generated code on each of the remaining signals is eliminated by mixing again with a locally generated code.