Patent ID: 6535833
Filing Date: 2003-03-18
Classification: G01S,H03H

Abstract:
A positioning system, comprising:a) a filter, responsive to an initial estimate of a state of motion of an object, and an initial value of state covariance, and further responsive to a succession of a plurality of measurements of the state, each plurality of measurements of the state corresponding to a different instant of time, for statistically determining a succession of state estimates; and b) a measurement engine, responsive to information provided at least in part by a cellular base station and from which a measurement of the state can be determined, for providing the succession of the pluralities of measurements of the state; wherein the filter comprises means for determining individual association probabilities, each corresponding to a respective state measurement from among the pluralities of state measurements at respective instants of time, for weighting innovations corresponding to each of the measurements in the pluralities of measurements of the state.