This inventor holds 2 USPTO granted patents. Top assignees: Point Research Corporation, Other. Active years: 2004-2005.
Company Filing History:
1 out of 2 
1 out of 834,453 Years Active: 2004-2005
Title: Innovations of Robert R. Marshall
Introduction
Robert R. Marshall is an accomplished inventor based in Walnut, California. He has made significant contributions to navigation technology, holding a total of 2 patents. His work focuses on improving the accuracy and functionality of navigation devices, particularly for personal use.
Latest Patents
One of Marshall's latest patents is the "Gyro Aided Magnetic Compass." This invention combines an electronic magnetic compass with an angular velocity sensing gyroscope. It integrates an angular velocity output signal from a gyroscope to determine the angle of motion. The initial magnetic heading is obtained from a geomagnetic sensor and serves as a reference for the integrated angular velocity signal. The invention adapts the time interval for blending the geomagnetic heading signal with the angular velocity output signal based on the reliability of the magnetic field. Additionally, it allows for dynamic calibration of the angular velocity sensor to correct for gyroscope bias and scale factor.
Another notable patent is the "Navigation Device for Personnel on Foot." This device enhances dead reckoning navigation for individuals on foot, utilizing accelerometers to detect abnormal steps and modify navigation calculations. It can identify various movements, such as running, walking sideways, or backwards, and compensates for these actions. One embodiment of this invention is a pedometer that attaches to the user's waist or torso, employing algorithms to accurately track distance and direction traveled.
Career Highlights
Throughout his career, Robert R. Marshall has worked with various companies, including Point Research Corporation. His innovative contributions have significantly impacted the field of navigation technology.
Collaborations
Marshall has collaborated with notable individuals in his field, including Robert W. Levi.
Conclusion
Robert R. Marshall's inventions reflect his dedication to advancing navigation technology. His patents demonstrate a commitment to improving user experience and accuracy in personal navigation devices.