Patent ID: 6812887
Filing Date: 2004-11-02
Classification: G01S

Abstract:
A method for conserving power in a positioning system receiver used in connection with a positioning system providing ranging signals, the receiver using the ranging signals to determine a state of motion of the receiver, the method comprising:a) a step (32) of performing at least a predetermined number of solutions of the state of motion of the receiver using a filter solution based on a mix of models of the motion of the receiver, a mix that is varied from one solution to the next according to a predetermined criteria, and of providing the model mix used in each solution; and b) a step (35) of adopting a partial duty cycle indicating a percentage of time selected receiver components are powered off, the percentage of time based on the mix of models used in successive solutions; wherein the step (32) of performing at least a predetermined number of solutions of the state of motion of the receiver is performed at least once during a time in the partial duty cycle when the selected receiver components are powered off.