Patent ID: 8825435
Filing Date: 2014-09-02
Classification: G01C

Abstract:
1. A subject location tracking process comprising: communicating radiofrequency signals from a radiofrequency sensory integration module with a remote RF transceiver beacon, said radiofrequency sensory integration module forming a system with an ankle mounted inertial tracking module and a microprocessor, and operative without line of sight with said remote RF transceiver beacon; determining a measured range between said radiofrequency sensory integration module and said beacon with software in said radiofrequency sensory integration module; accessing a database of known positions for the beacon to estimate a predicted range; computing an error value between the measured range and the predicted range, or between said radiofrequency signals and a predicted range, wherein positional data as to location of the system from said inertial tracking module is used to compute the predicted range; communicating a corrected position to said inertial tracking module to aid in resetting or correcting an orientation value or a velocity values as generated by an inertial module sensor within said inertial tracking module; adding a weighing factor to the measured range based on the error prior to determining the location data for the subject by trilaterating the location of the subject target; determining location data of the subject with said microprocessor and displaying the location; and wherein said microprocessor processes sets of data being generated in tandem by said radiofrequency sensory integration module and an inertial sensor in said inertial tracking module to form a mutually corrective system.