Method and a system for location estimation using location estimated

A system for location estimation comprising:

• a plurality of target terminals for transmitting and receiving a wireless signal;
• a plurality of reference terminals each arranged at a known location for transmitting and receiving the wireless signal;
• and
• a location estimator for receiving the wireless signal transmitted by said plurality of target terminals and said plurality of reference terminals;
• said location estimator acquiring information necessary for location estimation from the wireless signal received from said plurality of reference terminals, and finding out a first estimated location for each of said plurality of target terminals on a basis of the acquired information necessary for the location estimation and the location of said plurality of reference terminals;
• said location estimator acquiring information necessary for location estimation from the wireless signal received from said plurality of reference terminals and said plurality of target terminals, and finding out a second estimated location for each of said plurality of target terminals on the basis of the information necessary for the acquired location estimation, the first estimated location of ones of said plurality of target terminals other than the target terminal of which the estimated location is being found out, and the location of said plurality of reference terminals.

A system for location estimation comprising:

• a plurality of target terminals for transmitting and receiving a wireless signal;
• and
• a plurality of reference terminals arranged at known locations for transmitting and receiving a wireless signal;
• each of said plurality of target terminals having a location estimator enclosed therein for receiving a location estimation information signal transmitted from said plurality of reference terminals, measuring information necessary for location estimation from the location estimation information signal received, and finding out a first estimated location of the target terminal in question on a basis of the measured information necessary for location estimation, and a location of said plurality of reference terminals;
• said location estimator transmitting the location estimation information signal including information on the first estimated location;
• said location estimator measuring, on receipt of the location estimation information signal transmitted from ones of said plurality of target terminals other than said target terminal in question, the information necessary for location estimation from the location estimation information signal received;
• said location estimator finding out a second estimated location of said target terminal in question on the basis of the information necessary for location estimation measured from the location estimation information signal transmitted from said target terminals other than said target terminal in question, the first estimated location of said target terminals other than said target terminal in question contained in the location estimation information signal received, the information necessary for location estimation measured from the location estimation information signal transmitted from said plurality of reference terminals, and the location of said plurality of reference terminals.