Timothy R Schempp

US Patent:

7089452, Aug 8, 2006

Filed:

Sep 25, 2002

Appl. No.:

10/255029

Inventors:

Arthur Leonard Rubin - Brea CA, US
Timothy Robert Schempp - Anaheim CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G06F 11/00

US Classification:

714 32, 34235702, 701214

Abstract:

Mechanisms and techniques provide a system to evaluate operational integrity of a data processing system such as an area augmentation system by obtaining at least one set of distribution data related to information processed by the data processing system. The set(s) of distribution data can include corrections information and integrity bounds information related to the corrections information. The system applies a moment generating function to the set of distribution data to produce a moment bounded distribution data result and compares the moment bounded distribution data result to an integrity limit to determine if the data processing system operates within an acceptable integrity threshold. The system can be used in real-time or non-real time with sets of distribution data that are non-Gaussian, non-symmetric and/or non-unimodal.

US Patent:

8344946, Jan 1, 2013

Filed:

Aug 23, 2010

Appl. No.:

12/860954

Inventors:

Gregory S. Um - Torrance CA, US
Mark Wayne Biggs - Fullerton CA, US
Timothy Schempp - Anaheim CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 19/20

US Classification:

34235758

Abstract:

A method and apparatus for directly estimating depleted ionosphere delay in a GPS receiver and using the estimate for improved navigation precision in satellite based augmentation systems.

US Patent:

7019687, Mar 28, 2006

Filed:

Nov 22, 2004

Appl. No.:

10/994707

Inventors:

Timothy R. Schempp - Anaheim CA, US
Robert M. Fries - Irvine CA, US
Thomas L. McKendree - Huntington Beach CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H04B 7/185

US Classification:

34235702, 34235706

Abstract:

Methods and apparatus for providing integrity alert information include embedding the integrity alert message in a longer message stream that is broadcast to a receiver in order to meet a predetermined time to alert. In one particular embodiment, the receiver is a GPS receiver, the longer message is a navigation signal, and the integrity alert message is a 50 bit word containing an updated user range accuracy index. Advanced GPS users recognize the embedded integrity alert message by its message ID, pass a parity check on the integrity alert message and use the updated user range accuracy index in subsequent signal processing. Legacy GPS users fail parity on the integrity alert message and discard the message. The impact on legacy users is negligible since the infrequent alerts will only occasionally cause data to be discarded.

US Patent:

20220291392, Sep 15, 2022

Filed:

Mar 10, 2021

Appl. No.:

17/197186

Inventors:

- Waltham MA, US
Timothy R. Schempp - Fullerton CA, US

International Classification:

G01S 19/07
B64G 1/24
G06F 1/12

Abstract:

A system and method are provided for delivering orbit and clock corrections for Global Navigation Satellite Systems (GNSS) having: (1) reduced orbit and clock discontinuities when changes in ephemeris message from a satellite occur; (2) reduced quantization error by quantifying quantization error by fitting data within the constraints of the output message to prevent broadcast of large errors; and (3) reduced potential errors caused by old but active data.