Position bias amelioration method and apparatus in GNSS receiver
AssigneeTrimble Navigation Limited
InventorHassan Abou Ghaida
Life of this patent
Estimating the term…
Abstract
A method of eliminating user position biases caused by satellite constellation changes or differential signal gain/loss is provided. The method comprises: (A) substantially continuously determining an unbiased user's position by using a radio receiver”; (B) detecting a “detectable event” by using the radio receiver; (C) measuring a bias caused by the detectable event; (D) performing an update process by accumulating each bias caused by at least one detectable event to generate an accumulated bias; and (E) eliminating the accumulated bias at each Epoch by using a correction process.
Claims25
A method for eliminating user position biases caused by satellite constellation changes or differential signal gain/loss comprising:
- (A) substantially continuously 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 position bias in said initially unbiased user's position;
- and wherein said detectable event transitions said initial transmitter constellation into a “biased transmitter constellation”;
- (C) measuring a 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.
An apparatus for eliminating user position biases caused by satellite constellation changes or differential signal gain/loss comprising:
- (A) a radio receiver means configured for substantially continuously determining an unbiased user's position;
- wherein said unbiased user's position is determined by using an “initial transmitter constellation”;
- (B) a means for detecting a “detectable event”;
- wherein said detectable event causes a position bias in said initially unbiased user's position;
- and wherein said detectable event transitions said initial transmitter constellation into a “biased transmitter constellation”;
- (C) a means for measuring a 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) a means for performing an update process by accumulating each said bias caused by at least one said detectable event to generate an accumulated bias;
- and
- (E) a means for eliminating said accumulated bias at each Epoch by using a correction process.
An article comprising:
- a storage medium having stored thereon instructions that, when executed, result in a computing platform having the capability to eliminate user position biases caused by satellite constellation changes or differential signal gain/loss by executing an algorithm further comprising:
- (A) substantially continuously 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 position bias in said initially unbiased user's position;
- and wherein said detectable event transitions said initial transmitter constellation into a “biased transmitter constellation”.
- (C) measuring a 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.
Dependencies are inferred from the claim text.