Patent ID: 8031110
Filing Date: 2011-10-04
Classification: G01S

Abstract:
1. A method for eliminating user position biases caused by satellite constellation changes or differential signal gain/loss comprising: (A) determining an unbiased user's position by using a radio receiver, wherein said unbiased user's position is determined by using an “initial transmitter constellation”; (B) detecting a “detectable event” by using said radio receiver, wherein said detectable event causes a bias relative to said initially unbiased user's position, and wherein said detectable event transitions said initial transmitter constellation into a “biased transmitter constellation”; (C) measuring the bias caused by said detectable event; wherein said bias is selected from the group consisting of: {a position bias; and a pseudo range bias}; (D) performing an update process by accumulating each said bias caused by at least one said detectable event to generate an accumulated bias; and (E) eliminating said accumulated bias at each Epoch by using a correction process.