Position tracking system
First Claim
Patent Images
1. A position tracking system, comprising:
- at least three continuous-wave, simultaneously-transmitting radio frequency transmitting stations disposed in spaced relation to each other, one of which stations generating a signal at a first fixed frequency, and the other transmitting stations each generating a signal at a fixed frequency differing therefrom and from each other; and
a mobile receiving station simultaneously receiving the different frequency signals and responsive thereto to convert each frequency signal differing from said first frequency to said first frequency and simultaneously comparing the phase difference therebetween to produce an output signal indicative of the location of said mobile receiving station relative to the location of said transmitting stations.
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Abstract
The present invention is an improved position tracking system utilizing at least three cw transmitting stations generally symmetrically disposed about an area of interest, and also including a mobile receiving station receiving the transmitted signals, converting the received signals to a common frequency, and comparing the phase difference between the converted signals to produce and output signal indicating the location of the mobile station relative to any desired point or points in the area of interest.
75 Citations
21 Claims
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1. A position tracking system, comprising:
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at least three continuous-wave, simultaneously-transmitting radio frequency transmitting stations disposed in spaced relation to each other, one of which stations generating a signal at a first fixed frequency, and the other transmitting stations each generating a signal at a fixed frequency differing therefrom and from each other; and a mobile receiving station simultaneously receiving the different frequency signals and responsive thereto to convert each frequency signal differing from said first frequency to said first frequency and simultaneously comparing the phase difference therebetween to produce an output signal indicative of the location of said mobile receiving station relative to the location of said transmitting stations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A position tracking system, comprising:
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stationary signal generating means including at least three fixed- radio frequency transmitting stations in spaced relationship generally symmetrically disposed on a field of interest for generation by each of said transmitting stations a different-frequency cw signal; and mobile receiving means including a radio frequency signal receiver mounted on a mobile unit movable on the field of interest for receiving said different frequency signals, converting the frequency of each of said signals to a common frequency, comparing the phase differences between said common frequency signals, and producing therefrom an output indicative of the location of said mobile unit relative to desired locations on the field of interest. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification