Patent ID: 7039421
Filing Date: 2006-05-02
Classification: G01C,G01S

Abstract:
1. A system for determining the position of an object, comprising: a reference transmitter device arranged in a fixed position, said reference transmitter device including: a) a reference time supplying means for supplying a reference time signal indicating a reference time; b) a first signal generator for generating a first information signal containing at least the transmission time of the first information signal that is determined from the reference time signal; and c) a first transmitter for transmitting the first information signal and/or the reference time signal, said first transmitter including: two or more transmitter/receiver devices arranged in fixed positions with respect to each other and to the reference transmitter device, each transmitter/receiver device including: d) a first time supplying means for supplying a first time signal indicating a first time; e) a first receiver for receiving the reference time signal from the reference transmitter device; f) a synchronizer for processing the first time signal and the reference time signal and for synchronizing the first time with the reference time in consideration of the transit times of the reference time signal from the reference transmitter device to the transmitter/receiver device; g) a second signal processor for generating a second information signal containing at least the transmission time of the second information signal that is determined from the first time signal; and h) a second transmitter for transmitting the second information signal, said second transmitter including: a position determining device for determining the position of the object, said object including the position determining device and said position determining device including: i) a second time supplying means for supplying a second time signal indicating a second time; j) a second receiver for receiving a reception signal containing the first information signal and the second information signals, said second receiver means including: k) a processor for processing the reception information signals, said processing means including: