Method for determining a position of a receiver and positioning system for a receiver

• US 9,797,998 B2
• Filed: 03/02/2015
• Issued: 10/24/2017
• Est. Priority Date: 09/01/2012
• Status: Active Grant

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: Ette, Bernd, Holldack, Bernhard
• Primary Examiner(s): Liu, Harry
• Application Number:
  US14/635,578
• Publication Number:
  US 20150168544A1
• Time in Patent Office: 967 Days
• Field of Search: 342442
• CPC Class Codes: G01S 11/06 using intensity measurements
• CPC Class Codes: G01S 5/10 Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements , e.g. omega or decca systemsG01S5/12 takes precedence ; beacons and receivers cooperating therewith G01S1/306, G01S1/308
• CPC Class Codes: G07C 2209/63 Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
• CPC Class Codes: G07C 9/00174 Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys mechanical locks with electric permutation E05B49/00; arrangements for sensing or reading record carriers G06K7/00; electronic switching H03K17/00

Abstract

A method for determining a position of a receiver is provided. The method includes the emission of at least one electromagnetic field by a respective transmitter, an amplitude of the at least one electromagnetic field rotating respectively with respect to the respective transmitter. The method includes the measurement of the at least one electromagnetic field by the receiver and the determination of a differential phase. The method further includes the determination of the position based on the at least one differential phase.

Claims

1. A method for determining a position of a receiver, the method comprising:

emitting at least one electromagnetic field by a respective transmitter, wherein an amplitude of the at least one electromagnetic field rotates respectively as a function of time on a plane of rotation around the respective transmitter;

measuring the at least one electromagnetic field by the receiver;

determining a differential phase for each of the at least one electromagnetic field at the position of the receiver based on the measured at least one electromagnetic field; and

determining the position of the receiver based on the at least one determined differential phase,

wherein the respective transmitter includes at least three inductors arranged on the plane of rotation for the emission of the at least one electromagnetic field.

2. The method as set forth in claim 1, wherein the emission occurs sequentially for two or more electromagnetic fields, wherein the measurement occurs sequentially for the two or more electromagnetic fields, wherein the determination of the position of the receiver based on a triangulation is performed for the at least two differential phases, and wherein the determination of the position of the receiver comprises the determination of a direction and a distance at which the receiver is arranged on the plane of rotation of the electromagnetic field with respect to at least one of the transmitters.

3. The method as set forth in claim 1, wherein the emission and the measurement are performed for an individual electromagnetic field, and wherein the determination of the position of the receiver comprises the determination of a direction at which the receiver is arranged on the plane of rotation of the electromagnetic field with respect to at least one of the transmitters.

4. The method as set forth in claim 1, further comprising receiving an estimation of the position of the receiver, wherein the emission of the at least one electromagnetic field takes the estimation of the position into account.

5. The method as set forth in claim 2, wherein, depending on the estimation of the position of the receiver, the emission occurs either sequentially for the two or more electromagnetic fields or for the individual electromagnetic field.

6. The method as set forth in claim 1, further comprising determining a field intensity for the at least one electromagnetic field at the position of the receiver based on the measured at least one electromagnetic field, wherein the determination of the position of the receiver comprises the determination of a distance of the receiver to the plane of rotation of the electromagnetic field based on the determined field intensity.

7. The method as set forth in claim 1, further comprising modulating the at least one electromagnetic field for the transmission of information to the receiver, wherein the information comprises elements including timing information of a reference phase and/or identifying information of the at least one transmitter.

9. The method as set forth in claim 1, wherein the emission of the at least one electromagnetic field respectively comprises:

phase-shifted supplying of current to the at least three inductors of the at least one transmitter arranged on the plane of rotation of the electromagnetic field; and

the phase-shifted supplying of current taking into account a structurally predetermined angle arrangement of the at least three inductors on the plane of rotation so that a rotational frequency of the electromagnetic field is equal to a frequency of the electromagnetic field.

10. The method as set forth in claim 1, wherein the emission of the at least one electromagnetic field is triggered by a trigger signal transmitted by a control device.

11. The method as set forth in claim 1, wherein the receiver is moveable with respect to the at least one transmitter, wherein the at least one transmitter is connected to a control device, and the method further comprises wirelessly transmitting the determined differential phase and/or of the determined position from the moveable receiver to the control device.

8. A method for determining a position of a receiver, the method comprising:

emitting at least one electromagnetic field by a respective transmitter, wherein an amplitude of the at least one electromagnetic field rotates respectively as a function of time on a plane of rotation around the respective transmitter;

measuring the at least one electromagnetic field by the receiver;

determining a differential phase for each of the at least one electromagnetic field at the position of the receiver based on the measured at least one electromagnetic field; and

determining the position of the receiver based on the at least one determined differential phase;

emitting at least one other electromagnetic field by a respective transmitter, the at least one other electromagnetic field having a frequency that is greater than a frequency of the at least one electromagnetic field;

measuring the at least one other electromagnetic field by the receiver; and

determining a field intensity for each of the at least one other electromagnetic field at the position of the receiver based on the measured at least one other electromagnetic field; and

determining a distance of the receiver to the at least one transmitter based on the at least one detected field intensity,

wherein the determination of the distance of the receiver is performed based on the at least one detected field intensity for determining the position of the receiver in a remote range to the at least one transmitter, wherein the determination of the position of the receiver is performed based on the at least one determined differential phase for determining the position of the receiver in a near range to the at least one transmitter, and wherein the emission and the measurement of the at least one electromagnetic field as well as the determination of the differential phase for each of the at least one electromagnetic field and the determination of the position of the receiver are performed selectively based on the at least one determined differential phase in consideration of the determination of the distance of the receiver.

12. A positioning system for a receiver, the positioning system comprising:

at least one transmitter that is respectively set up to emit an electromagnetic field, an amplitude of the electromagnetic field rotating as a function of time on a plane of rotation around the transmitter;

the receiver that is set up to measure the at least one electromagnetic field, and

a processor unit that performs the steps;

determining a differential phase for each of the at least one electromagnetic field at the position of the receiver based on the measured at least one electromagnetic field; and

determining the position of the receiver based on the at least one determined differential phase,

wherein the at least one transmitter includes at least three inductors arranged on the plane of rotation for the emission of the electromagnetic field.

13. The positioning system as set forth in claim 12, wherein for determining a position of a receiver a method comprises:

emitting at least one electromagnetic field by a respective transmitter, wherein an amplitude of the at least one electromagnetic field rotates respectively as a function of time on a plane of rotation around the respective transmitter;

measuring the at least one electromagnetic field by the receiver;

determining a differential phase for each of the at least one electromagnetic field at the position of the receiver based on the measured at least one electromagnetic; and

determining the position of the receiver based on the at least one determined differential phase.

15. The positioning system as set forth in claim 12, wherein the emission of the at least one electromagnetic field respectively comprises:

phase-shifted supplying of current to the at least three inductors of the at least one transmitter arranged on the plane of rotation of the electromagnetic field; and

the phase-shifted supplying of current taking into account a structurally predetermined angle arrangement of the at least three inductors on the plane of rotation so that a rotational frequency of the electromagnetic field is equal to a frequency of the electromagnetic field.

14. An automobile comprising a positioning system for a receiver, the positioning system comprising:

at least one transmitter, each of which is set up to emit a time-dependent electromagnetic field, wherein an amplitude of the electromagnetic field rotates as a function of time on a plane of rotation around the transmitter; and

the receiver, which is set up to measure the at least one time-dependent electromagnetic field; and

a processor unit that is set up to carry out the steps;

determining a differential phase for each of the at least one electromagnetic field at the position of the receiver based on the measured at least one time-dependent electromagnetic field; and

determining the position of the receiver based on the at least one determined differential phase,

wherein the at least one transmitter includes at least three inductors arranged on the plane of rotation for the emission of the electromagnetic field.

16. The automobile as set forth in claim 14, wherein the emission of the at least one electromagnetic field respectively comprises:

phase-shifted supplying of current to the at least three inductors of the at least one transmitter arranged on the plane of rotation of the electromagnetic field; and

the phase-shifted supplying of current taking into account a structurally predetermined angle arrangement of the at least three inductors on the plane of rotation so that a rotational frequency of the electromagnetic field is equal to a frequency of the electromagnetic field.