Steven A Gronemeyer

US Patent:

6496145, Dec 17, 2002

Filed:

Oct 4, 2001

Appl. No.:

09/971297

Inventors:

Steven A. Gronemeyer - Cedar Rapids IA

Assignee:

SiRF Technology, Inc. - San Jose CA

International Classification:

G01S 316

US Classification:

342378, 34235706, 375208

Abstract:

A signal detector is provided in which complex samples of a received signal are multiplied by data representative of a hypothesis, and the resulting product data is coherently integrated over a desired duration to provide correlation data representative of the level of correlation between the hypothesis and the signal. In one embodiment, the signal detector is part of a GPS receiver.

US Patent:

6577271, Jun 10, 2003

Filed:

Mar 30, 1999

Appl. No.:

09/281566

Inventors:

Steven A. Gronemeyer - Cedar Rapids IA

Assignee:

Sirf Technology, INC - San Jose CA

International Classification:

G01S 316

US Classification:

342378, 342382, 34235706, 375208

Abstract:

A signal detector is provided in which complex samples of a received signal are multiplied by data representative of a hypothesis, and the resulting product data is coherently integrated over a desired duration to provide correlation data representative of the level of correlation between the hypothesis and the signal. In one embodiment, the signal detector is part of a GPS receiver.

US Patent:

6636178, Oct 21, 2003

Filed:

Oct 4, 2001

Appl. No.:

09/971293

Inventors:

Steven A. Gronemeyer - Cedar Rapids IA

Assignee:

SiRF Technology, Inc. - San Jose CA

International Classification:

G01S 316

US Classification:

342378, 34235706, 34235712, 375130, 375140, 375147, 375150

Abstract:

A signal detector is provided in which correlation analyses of multiple segments of a received signal from separate and distinct periods of time are combined to improve the detection capability of the signal detector. In one embodiment, the signal detector is part of a GPS receiver.

US Patent:

6662107, Dec 9, 2003

Filed:

Oct 30, 2001

Appl. No.:

10/021119

Inventors:

Steven A. Gronemeyer - Cedar Rapids IA

Assignee:

SiRF Technology, Inc. - San Jose CA

International Classification:

G01C 2100

US Classification:

701213, 701214, 34235712, 342358

Abstract:

Power is conserved in a Global Positioning System (GPS) receiver by shutting down selected components during periods when the GPS receiver is not actively calculating the GPS receiver location. A low power time keeping circuit accurately preserves GPS time when the selected components are deactivated. When the selected components are turned on in response to a wake-up command, time provided from the low power time keeping circuit, corrected for actual operating temperatures, and data from the GPS clock temperature/frequency table, are used to recalibrate time from a GPS oscillator. Positions of the GPS satellites are then estimated such that the real GPS time is quickly determined from the received satellite signals. Once real GPS time is determined from the detected satellite signals, the selected components are deactivated. The process described above is repeated such that accurate GPS time is maintained by the low power time keeping circuit.

US Patent:

6714158, Mar 30, 2004

Filed:

Apr 18, 2000

Appl. No.:

09/552759

Inventors:

Paul A. Underbrink - Lake Forest CA
Steven A. Gronemeyer - Cedar Rapids IA

Assignee:

SiRF Technology, Inc. - San J ose CA

International Classification:

H04B 7185

US Classification:

34235712, 34235715

Abstract:

A data detection circuit within a global positioning system (GPS) satellite receiver operates to detect and decode data sent in a spread spectrum signal. The data detection circuit receives input from a radio receiver, the information containing data from a plurality of satellites. The data is supplied to a circular memory device, which determines which data corresponds to which satellite. The memory device sends the received signal to a matched filter, which decodes the signal received from each satellite. This signal is analyzed to determine whether a phase inversion due to data modulation on the received signal is present. The phase inversion can occur at boundaries, known as data epochs, in the received signal, and corresponds to data in the received signal. This data contains information relating to the position of each satellite and is collected by the data detection circuit for use by the GPS receiver.

US Patent:

6778136, Aug 17, 2004

Filed:

Dec 13, 2001

Appl. No.:

10/017115

Inventors:

Steven A. Gronemeyer - Cedar Rapids IA

Assignee:

SiRF Technology, Inc. - San Jose CA

International Classification:

G01S 514

US Classification:

34235715, 34235712

Abstract:

Upon reception of four GPS signals from GPS satellites and determining four pseudo ranges, along with ephemeris data previously stored in the GPS receiver, the location of the GPS receiver and real time clock time error is determined. The GPS receiver is in possession of four pseudo ranges and determines four unknown coordinate values (x, y, x, and time) identifying the location of the GPS receiver and real time clock error. The process of solving for four pseudo range formulas simultaneously with each pseudo range formula having an unknown âxâ, âyâ âzâ, and time coordinates of the GPS receiver, results in identification of the coordinates and time of the GPS receiver. In a similar process, the GPS receiver receiving four GPS signals from four GPS satellites is able to determine four pseudo ranges. Using the four pseudo ranges, four pseudo range equations unknown values for âxâ, âyâ, âzâ and time can be solved for simultaneously.

US Patent:

6850557, Feb 1, 2005

Filed:

Apr 18, 2000

Appl. No.:

09/551047

Inventors:

Steven A. Gronemeyer - Cedar Rapids IA, US

Assignee:

SiRF Technology, Inc. - San Jose CA

International Classification:

H04B 1707
H04B 1713

US Classification:

375150, 342357, 342378, 701213, 455 121

Abstract:

A signal detector employs a coherent accumulation system that coherently combines the correlation results derived from segments of samples of a received signal. The segments may have non-uniform lengths and may have been obtained over different and non-overlapping time periods. The segments are obtained during sampling windows of arbitrary length and at arbitrary times, and the results of processing the segments are successively combined in a coherent manner (separate magnitude and phase accumulation) until a threshold signal-to-noise ratio (SNR) has been achieved. Coherent integration is enabled by introducing a carrier phase offset as well as a code phase offset, so that different segments are aligned in carrier phase as well as code phase. Although not limited to this application, in one implementation example, the signal detector is used in connection with and as part of a global positioning system (GPS) receiver.

US Patent:

6917331, Jul 12, 2005

Filed:

Apr 25, 2003

Appl. No.:

10/423137

Inventors:

Steven Gronemeyer - Cedar Rapids IA, US

Assignee:

SiRF Technology, Inc. - San Jose CA

International Classification:

G01S003/16

US Classification:

342378, 34235706, 342382

Abstract:

A signal detector is provided in which complex samples of a received signal are multiplied by data representative of a hypothesis, and the resulting product data is coherently integrated over a desired duration to provide correlation data representative of the level of correlation between the hypothesis and the signal. In one embodiment, the signal detector is part of a GPS receiver.