A METHOD, A SYSTEM, A TRANSPONDER, AND A POSITION DETECTION APPARATUS FOR A PRECISE MEASUREMENT OF A POSITION

• US 20170168154A1
• Filed: 03/31/2015
• Published: 06/15/2017
• Est. Priority Date: 04/01/2014
• Status: Active Grant

• Current Assignee: Nitiu AB
• Original Assignee: Utvecklingsavdelningen I Sverige AB
• Inventors: Wallin, Kjell
• Granted Patent: US 10,495,744 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 13/74 Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
• CPC Class Codes: G01S 13/76 wherein pulse-type signals are transmitted
• CPC Class Codes: G01S 13/767 Responders; Transponders teaching or practice apparatus for gun-aiming or gun-laying using reflecting targets or active targets F41G3/26
• CPC Class Codes: G01S 13/785 Distance Measuring Equipment [DME] systems
• CPC Class Codes: G01S 13/788 Coders or decoders therefor; Special detection circuits
• CPC Class Codes: G01S 13/84 for distance determination by phase measurement
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location

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.

Claims

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.

2. The method according to claim 1, wherein the modulation of the received pseudo number sequence further comprises:

a differential modulation by means of the at least two predetermined number of clock cycles in such a way that information from the transponder is encoded within the modulated pseudo number sequence.

3. The method according to claim 2, wherein the detection of the clock correction factor further comprises:

decoding the information from the transponder by means of decoding the time delay of the modulated pseudo number sequence.

4. The method according to claim 1, wherein the generated pseudo number sequence is a pseudo random binary sequence.

5. A system for determining a distance, comprising:

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.

6. The system according to claim 5, wherein the means for modulation of the received pseudo number sequence further comprises:

means for a differential modulation by means of the at least two predetermined delay times in such a way that an identifier of the transponder is encoded within the modulated pseudo number sequence.

7. The system according to claim 5, wherein the means for detection of the clock correction factor further comprises:

means for decoding the identity of the transponder by means of decoding the timing of the modulated pseudo number sequence.

8. The system according to claim 5, wherein the means for generating the pseudo number sequence is a means for generating a pseudo random binary sequence.

9. A position detection apparatus, comprising:

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.

10. The position detection apparatus according to claim 9, wherein the means for detection of the clock correction factor further comprises:

means for decoding the identity of the transponder by means of decoding the timing of the modulated pseudo number sequence.

11. The position detection apparatus according to claim 9, wherein the means for generating the pseudo number sequence is a means for generating a pseudo random binary sequence.

12. A transponder comprising:

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.

13. The transponder according to claim 12, wherein the means for modulation of the received pseudo number sequence further comprises:

means for a differential modulation by means of the at least two predetermined delay times in such a way that an identifier of the transponder is encoded within the modulated pseudo number sequence.