| 摘要 |
A location determination system ( 100 ) utilizes a low accuracy timing infrastructure ( 106 ) to synchronize a personal tracking device ( 120 ) having high accuracy timing location determination devices integrated therein. The PTD ( 120 ) includes a radio frequency (RF) location unit ( 102 ) and integrated sensors, such as altimeter ( 132 ), GPS receiver ( 134 ) and inertial navigation unit (IMU) ( 136 ). The RF location unit ( 102 ) receives a synchronization command from the low accuracy timing infrastructure ( 106 ) and provides timing data representing range information in response thereto. The range information is used by the high accuracy timing infrastructure ( 180 ) to compute updated X, Y, Z coordinates of the PTD ( 120 ).
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