Richard F Woo

US Patent:

6760393, Jul 6, 2004

Filed:

May 4, 2000

Appl. No.:

09/564683

Inventors:

Jalal Alisobhani - Crona Del Mar CA
Donald K. Leimar - Rancho Palos Verdes CA
Richard Kai-Tuen Woo - Orange CA
Mark Philip Kaplan - Culver City CA

Assignee:

Navcom Technology, Inc. - Redondo Beach CA

International Classification:

H04L 700

US Classification:

375365, 375368, 375376

Abstract:

A communication device includes a transmitter and receiver. The transmitter includes an M-ary encoder configured to generate an M-1 number of distinctive symbols each comprising k bits. M is equal to 2k and k is a positive integer. The transmitter also includes a code generator configured to produce spread spectrum codeword sequences based on the symbols generated by the M-ary encoder and based on a first and a second Gold code polynomials. The transmitter sends a radio signal based on the spread spectrum codeword sequences. The receiver is configured to receive the radio signal. The receiver includes a first shift register configured to receive an input signal generated based on the received radio signal and a second shift register configured to receive and circularly shift a locally generated codeword sequence that is identical to the codeword sequence used to encode the symbols.

US Patent:

20050002481, Jan 6, 2005

Filed:

Jul 3, 2003

Appl. No.:

10/614098

Inventors:

Richard Woo - Orange CA, US
Mark Rentz - Torrance CA, US
Scott Stephens - Phoenix AZ, US
Mark Kaplan - Culver City CA, US
Andrea Woo - Orange CA, US
Russell Woo - Palo Alto CA, US

International Classification:

H04L007/00

US Classification:

375354000, 375219000, 342118000

Abstract:

A positioning system includes a plurality of devices configured to exchange RF signals with one another. A first device periodically receives a message from each other device during time slots assigned them. The received message includes information representing a time of arrival at the other device of a respective message transmitted by the first device. A time of arrival of the message from each of the other devices is determined by the first device. The first device periodically transmits messages to the other devices, each transmitted message including information representing the determined time of arrival for at least one of the other devices. A range from the first device to each of a plurality of the other devices is determined as function of the determined time of arrival of the message from the other device and the time of arrival information in the message from the other device.

US Patent:

58085823, Sep 15, 1998

Filed:

Feb 5, 1997

Appl. No.:

8/795608

Inventors:

Richard Kai-Tuen Woo - Orange CA

Assignee:

Litton Consulting Group, Inc. - Redondo Beach CA

International Classification:

G01S 502

US Classification:

342357

Abstract:

A global positioning system receiver includes an inbound signal terminal to receive an inbound global positioning system signal having an inbound PRN code from a global positing system signal source. A local PRN code generator is configured to generate a local PRN code. A discriminator is coupled to the inbound signal terminal and to the local PRN code generator and configured to compare the inbound signal and the local PRN code and to generate a discriminator signal containing a positive portion and a negative portion. A processor is coupled to the discriminator and configured to receive the discriminator signal to process the discriminator signal to determine a bit code and to determine a distance from the global positing system signal source based on said bit code. In one embodiment, the discriminator includes an acquisition mode configured to acquire the inbound PRN code wherein the discriminator has a first gate width and a tracking mode configured to track the PRN code wherein the discriminator has a second gate width less than the first gate width. Advantages of the invention include improved multipath signal rejection.

US Patent:

6259401, Jul 10, 2001

Filed:

Apr 14, 1998

Appl. No.:

9/060399

Inventors:

Richard Kai-Tuen Woo - Orange CA

Assignee:

Navcom Technology, Inc. - Redondo Beach CA

International Classification:

G01S 502

US Classification:

34235712

Abstract:

A global positioning system receiver includes an inbound signal terminal to receive an inbound global positioning system signal having an inbound PRN code from a global positing system signal source. A local PRN code generator is configured to generate a local PRN code. A discriminator is coupled to the inbound signal terminal and to the local PRN code generator and configured to compare the inbound signal and the local PRN code and to generate a discriminator signal containing a positive portion and a negative portion. A processor is coupled to the discriminator and configured to receive the discriminator signal to process the discriminator signal to determine a bit code and to determine a distance from the global positing system signal source based on said bit code. In one embodiment, the discriminator includes an acquisition mode configured to acquire the inbound PRN code wherein the discriminator has a first gate width and a tracking mode configured to track the PRN code wherein the discriminator has a second gate width less than the first gate width. Advantages of the invention include improved multipath signal rejection.