A METHOD, A SYSTEM, A TRANSPONDER, AND A POSITION DETECTION APPARATUS FOR A PRECISE MEASUREMENT OF A POSITION
First Claim
1. A method for determining a distance, comprising:
- providing a position detection apparatus, comprising;
a first processing means;
a first transmitting means;
a first receiving means;
providing a transponder comprising;
a second processing means;
a second receiving means;
a second transmitting means;
generating a pseudo number sequence by means of the first processing means;
transmitting the pseudo number sequence by means of the first transmitting means;
receiving the pseudo number sequence by means of the second receiving means;
modulate the received pseudo number sequence by means of delaying the received pseudo number sequence a predetermined number of clock cycles from a group of at least two predetermined number of clock cycles, by means of the second processing means;
transmitting the modulated pseudo number sequence by means of the second transmitting means;
receiving the modulated pseudo number sequence by means of the first receiving means;
detecting a path time of the pseudo number sequence, by means of delaying and correlating the generated pseudo number sequence with the received modulated pseudo number sequence, wherein the delay time corresponds to the path time, by means of the first processing means;
detecting a clock correction factor for the transponder using the received modulated pseudo number sequence, by means of the first processing means;
calculating a flight time of the pseudo number sequence between the position detection apparatus and the transponder by means of the path time, the clock correction factor, and the predetermined number of clock cycles of the transponder, by means of the first processing means;
calculating the distance between said position detection apparatus and said transponder by means of the flight time, by means of the first processing means.
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Accused Products
Abstract
The present invention relates to a system for determining a distance, a transponder, a position detection apparatus, and a method therefor. The method for determining a distance comprises providing a position detection apparatus (101), and a transponder (105). The method further comprises generating (201) a pseudo number sequence, transmitting (202) the pseudo number sequence, receiving (203) the pseudo number sequence; modulate (204) the received pseudo number sequence by means of delaying the recieved pseudo number sequence a predetermined number of clock cycles from a group of at least two predetermined number of clock cycles. The method further comprises transmitting (205) the modulated pseudo number sequence, recieving (206) the modulated pseudo number sequence, detecting (207) a path time of the pseudo number sequence, by means of delaying and correlating the generated pseudo number sequence with the received modulated pseudo number sequence, wherein the delay time corresponds to the path time, The method further comprises detecting (208) a clock correction factor for the transponder (105) using the received modulated pseudo number sequence, calculating (209) a flight time of the pseudo number sequence between the position detection apparatus and the transponder by means of the path time, the clock correction factor, and the predetermined number of clock cycles of the transponder, and calculating (210) the distance between said position detection apparatus and said transponder by means of the flight time.
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Citations
13 Claims
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1. A method for determining a distance, comprising:
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providing a position detection apparatus, comprising; a first processing means; a first transmitting means; a first receiving means; providing a transponder comprising; a second processing means; a second receiving means; a second transmitting means; generating a pseudo number sequence by means of the first processing means; transmitting the pseudo number sequence by means of the first transmitting means; receiving the pseudo number sequence by means of the second receiving means; modulate the received pseudo number sequence by means of delaying the received pseudo number sequence a predetermined number of clock cycles from a group of at least two predetermined number of clock cycles, by means of the second processing means; transmitting the modulated pseudo number sequence by means of the second transmitting means; receiving the modulated pseudo number sequence by means of the first receiving means; detecting a path time of the pseudo number sequence, by means of delaying and correlating the generated pseudo number sequence with the received modulated pseudo number sequence, wherein the delay time corresponds to the path time, by means of the first processing means; detecting a clock correction factor for the transponder using the received modulated pseudo number sequence, by means of the first processing means; calculating a flight time of the pseudo number sequence between the position detection apparatus and the transponder by means of the path time, the clock correction factor, and the predetermined number of clock cycles of the transponder, by means of the first processing means; calculating the distance between said position detection apparatus and said transponder by means of the flight time, by means of the first processing means. - View Dependent Claims (2, 3, 4)
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5. A system for determining a distance, comprising:
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a position detection apparatus, comprising; a first transmitting means; a first receiving means; a first processing means, comprising; means for generating a pseudo number sequence; means for decoding the modulated pseudo number sequence; means for detecting a path time of the pseudo number sequence, by means of delaying and correlating the generated pseudo number sequence with the received modulated pseudo number sequence, wherein the delay time corresponds to the path time; means for detecting a clock correction factor of the transponder by means of the predetermined delay time of the received modulated pseudo number sequence; means for calculating a flight time of the pseudo number sequence between the position detection apparatus and a transponder by means of the path time, the clock correction factor, and the predetermined delay time of the transponder; means for calculating the distance between said position detection apparatus and said transponder by means of the flight time; a transponder comprising; a second receiving means; a second transmitting means; a second processing means, comprising; means for receiving the pseudo number sequence; means for modulation of the received pseudo number sequence forming the modulated pseudo number sequence, wherein said means for modulation is adapted to modulate the received pseudo number sequence by means of delaying the received pseudo number sequence a predetermined delay time from a group of at least two predetermined delay times; means for sending the modulated pseudo number sequence. - View Dependent Claims (6, 7, 8)
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9. A position detection apparatus, comprising:
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a first transmitting means; a first receiving means; a first processing means comprising; means for detecting a path time of the pseudo number sequence, by means of delaying and correlating the generated pseudo number sequence with the received modulated pseudo number sequence, wherein the delay time corresponds to the path time; means for detecting a clock correction factor of the transponder by means of the predetermined delay time of the received modulated pseudo number sequence; means for calculating a flight time of the pseudo number sequence between the position detection apparatus and the transponder by means of the path time, the clock correction factor, and the predetermined delay time of the transponder; means for calculating the distance between said position detection apparatus and said transponder by means of the flight time. - View Dependent Claims (10, 11)
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12. A transponder comprising:
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means for receiving the pseudo number sequence; means for modulating the received pseudo number sequence forming the modulated pseudo number sequence, wherein said means for modulating is adapted to modulate the received pseudo number sequence by means of delaying the received pseudo number sequence a predetermined delay time from a group of at least two predetermined delay times; means for sending the modulated pseudo number sequence. - View Dependent Claims (13)
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Specification