Jeffrey G Sanders

US Patent:

6970500, Nov 29, 2005

Filed:

Jul 31, 2001

Appl. No.:

09/919217

Inventors:

Jeffrey D. Sanders - San Jose CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

H04B001/69

US Classification:

375150

Abstract:

Apparatus and methods for determining the timing of the data bit transitions. “N” assumptions of data bit transitions are used for determining N integrations of an incoming spread signal for data bit time periods where N is the data bit time period divided by the code time period. In a first variation, the N assumptions use N start times separated by code time periods. In a second variation, the N assumptions use N sign inversion times separated by code time periods. In either variation the unsigned values of the N integrations, respectively, may be combined for several data bit time periods. The assumed transition timing that results in the strongest of the N integrations is indicative of the timing of the data bit transitions.

US Patent:

7230568, Jun 12, 2007

Filed:

Nov 5, 2004

Appl. No.:

10/982158

Inventors:

Krishnaranjan S. Rao - Sunnyvale CA, US
Gregory C. Best - San Francisco CA, US
Jeffrey D. Sanders - San Jose CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G01S 5/14

US Classification:

34235712

Abstract:

A global navigation satellite system (GNSS) receiver using phase lock loops for strong GNSS signals and automatic frequency control (AFC) loops for weak GNSS signals on a satellite-by-satellite basis. The phase lock loops or the AFC loops associated with particular GNSS satellites generate frequency feedback adjustments for tracking the carrier frequencies of the incoming GNSS signals in order to determine pseudoranges for calculating a location fix. The transition from an AFC loop to a phase lock loop is controlled for each GNSS signal depending on location quality parameters including a history of previous loop transitions, knowledge of whether a transition is in-progress, and a conditional PDOP. The conditional PDOP is the calculated PDOP where the pseudorange from the particular GNSS signal is removed from the computation of the location fix.

US Patent:

7266144, Sep 4, 2007

Filed:

Aug 8, 2005

Appl. No.:

11/199407

Inventors:

Jeffrey D. Sanders - San Jose CA, US

International Classification:

H04B 1/00

US Classification:

375150

Abstract:

Apparatus and methods for determining the timing of the data bit transitions. “N” assumptions of data bit transitions are used for determining N integrations of an incoming spread signal for data bit time periods where N is the data bit time period divided by the code time period. In a first variation, the N assumptions use N start times separated by code time periods. In a second variation, the N assumptions use N sign inversion times separated by code time periods. In either variation the unsigned values of the N integrations, respectively, may be combined for several data bit time periods. The assumed transition timing that results in the strongest of the N integrations is indicative of the timing of the data bit transitions.

US Patent:

20070098131, May 3, 2007

Filed:

Oct 31, 2005

Appl. No.:

11/261489

Inventors:

Daniel Pappone - San Jose CA, US
Daniel Sommerville - Soquel CA, US
Teddy McDowell - San Jose CA, US
John Lynch - Greenville SC, US
David Galbally - Madrid, ES
Venkat Ramani - San Jose CA, US
Jeffrey Sanders - Santa Cruz CA, US
Matthew O'Connor - Fremont CA, US

International Classification:

G21C 17/00

US Classification:

376245000

Abstract:

A system and method for predicting acoustic loads expected on a boiling water reactor (BWR) may include a BWR scale model, a test fixture for generating air flow in the scale model, and one or measurement devices for monitoring system behavior to predict how acoustic loads may affect plant operation for the BWR being evaluated.

US Patent:

20110043373, Feb 24, 2011

Filed:

Aug 20, 2009

Appl. No.:

12/544869

Inventors:

Gregory C. Best - San Francisco CA, US
Andrew Ansell - Santa Clara CA, US
Gwen Byard - Mountain View CA, US
James W. Jervis - Sunnyvale CA, US
Jeffrey D. Sanders - San Jose CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G06K 7/02

US Classification:

34082549

Abstract:

A reverse RFID location system is based on set of RFID tags in which each tag stores data representing its position.

US Patent:

61917311, Feb 20, 2001

Filed:

Aug 25, 1999

Appl. No.:

9/384086

Inventors:

Paul W. McBurney - San Francisco CA
Jeffrey D. Sanders - San Jose CA

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

H04B 7185

US Classification:

34235705

Abstract:

A global positioning system (GPS) receiver having a fast time to first fix using the velocity of a GPS satellite and an approximate time. The GPS receiver includes a GPS antenna for receiving a GPS signal, radio frequency circuitry for downconverting and sampling the GPS signal, a reference timer for providing a reference clocking signal, a digital signal processor for receiving the sampled GPS signal, and a microprocessor for executing program codes in a memory. The digital signal processor cooperates with the microprocessor for correlating the sampled GPS signal to an internal GPS replica signal based upon the reference clocking signal. The memory includes program codes for a pseudorange detector for measuring code phase offsets, a directional cosine calculator for calculating unit vectors, a satellite velocity calculator for calculating vector velocities, a pseudorange linearizer for determining linearized pseudoranges, and a velocity-enhanced location calculator. The velocity-enhanced location calculator uses an approximate absolute time with the linearized pseudoranges, unit vectors, and velocities of five or more GPS satellites for determining a GPS-based location for the GPS receiver before receiving a Z-count in a GPS signal. The error in the approximate time may be up to at least 100 seconds.

US Patent:

20230033108, Feb 2, 2023

Filed:

Oct 7, 2022

Appl. No.:

17/961980

Inventors:

- Los Gatos CA, US
Sergey Kondrashov - Los Gatos CA, US
Jeffrey Dwain Sanders - San Jose CA, US
Zvi Alon - Los Altos Hills CA, US
Benjamin Victor Duane Henry - Los Gatos CA, US
Sam Arditi - Discovery Bay CA, US

International Classification:

H04L 7/033
H04B 3/54
H03L 7/08

Abstract:

A transmitter includes a modulator configured to digitally generate a communication signal whose modulation represents coded information to be transmitted to a local management unit. The transmitter can include a control unit configured to generate harmonic frequencies that are in-phase, inverted, or out-of-phase from a raw signal using fundamental frequencies for modulation.

US Patent:

20210320500, Oct 14, 2021

Filed:

Apr 8, 2021

Appl. No.:

17/225885

Inventors:

- Campbell CA, US
Sergey Kondrashov - Los Gatos CA, US
Jeffrey Dwain Sanders - San Jose CA, US
Benjamin Victor Duane Henry - San Jose CA, US

International Classification:

H02J 3/38
H04B 3/54
H04B 3/32
H04B 1/04

Abstract:

A transmitter having: an oscillator to generate a clock signal and synthesize frequencies for modulating a message to generate first signals to a first direct current power line, and a control circuit to adjust timing of the first signals in synchronization with second signals transmitted in a second direct current power line disposed in a vicinity of the first direct current power line, by synchronizing phase of the first and second signals or by transmitting the first and the second signals in separate time windows.