Method and system for localizing mobile communications terminals
AssigneeTelecom Italia S.p.A.
InventorGiorgio Ghinamo
Life of this patent
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Abstract
A method of determining a geographic position of a user terminal including a receiver of signals of a global navigation satellite system, the method including the user terminal: performing pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system; calculating a first estimated position thereof by a weighted least square method; calculating post-fit residuals for the first estimated position; comparing the calculated post-fit residuals to a first threshold and: in case the first threshold is exceeded, calculating a second estimated position using a Monte-Carlo method, otherwise retaining the first estimated position as the geographic position of the mobile communications terminal.
Claims8
A method of determining a geographic position of a user terminal comprising a receiver of signals of a global navigation satellite system, the method comprising:
- performing, at the user terminal, pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system;
- calculating, at the user terminal, a first estimated position thereof by means of a weighted least square method;
- calculating, at the user terminal, post-fix residuals for the first estimated position;
- comparing, at the user terminal, the calculated post-fix residuals to a first threshold;
- in case the first threshold is exceeded, calculating, at the user terminal, a second estimated position using a Monte-Carlo method;
- and
- in case the first threshold is not exceeded, retaining, at the user terminal, the first estimated position as the geographic position of the mobile communications terminal.
A user terminal comprising:
- a receiver configured to receive signals from a global navigation satellite system;
- and
- a processor circuit configured to:
- perform pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system;
- calculate a first estimated position thereof by means of a weighted least square method;
- calculate post-fix residuals for the first estimated position;
- compare the calculated post-fix residuals to a first threshold;
- in case the first threshold is exceeded, calculate a second estimated position using a Monte-Carlo method;
- and
- in case the first threshold is not exceeded, retain the first estimated position as the geographic position of the mobile communications terminal.
Dependencies are inferred from the claim text.