发明名称 |
CALIBRATION FOR WIRELESS LOCATION SYSTEM |
摘要 |
An external calibration method comprises the steps of transmitting a first reference signal from a reference transmitter; receiving the first reference signal at first and second receiver systems; (10-2A-10-2C); determining a first error value by comparing a measured TDOA value with a theoretical TDOA value associated with the known locations of the receiver systems and the known location of the reference transmitter; and utilizing the first error value to correct subsequent TDOA measurements associated with a mobile transmitter to be located. An internal calibration method comprises the steps of injecting a comb signal into the first receiver system; utilizing the comb signal to obtain an estimate of the manner in which the transfer function varies across the bandwidth of the first receiver system; and utilizing the estimate to mitigate the effects of the variation of the first transfer function on the time measurement made by the first receiver system. |
申请公布号 |
WO0041403(A3) |
申请公布日期 |
2000.09.21 |
申请号 |
WO1999US29505 |
申请日期 |
1999.12.13 |
申请人 |
TRUEPOSITION, INC. |
发明人 |
STILP, LOUIS, A. |
分类号 |
G01S19/25;G01S1/02;G01S1/24;G01S3/02;G01S5/02;G01S5/06;G01S19/03;G01S19/09;G01S19/11;G01S19/46;G01S19/48;H04W4/22;H04W64/00 |
主分类号 |
G01S19/25 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|