# US 2021/0333335 A1 · Magnetic parking sensor

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- Number: US 2021/0333335 A1
- Document ID: US20210333335A1
- Status: Published application
- Kind: A1
- Application number: 17/264,654
- Filed: 2019-10-15
- Published: 2021-10-28
- Earliest claimed: 2018-11-28
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Peter Bakucz
- Web page: https://patentgrep.com/patent/US20210333335A1

## CPC

- G01R 33/0029: {Treating the measured signals, e.g. removing offset or noise}
- G01R 33/0206: {Three-component magnetometers}
- G01V 3/081: {the magnetic field is produced by the objects or geological structures (characterised by the method of magnetic field measurement G01R33/00)}
- G08G 1/141: {with means giving the indication of available parking spaces}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93})

## Abstract

A magnetic parking sensor including a detection device for detecting geomagnetic measured values in the region of a parking space in three coordinates; a first-in, first-out memory device into which the geomagnetic measured values are loadable; and an ascertainment device. The ascertainment device is configured to map the x and y components of the geomagnetic measured values into complex numbers, the complex numbers being ascertainable depending on the variability of the defined number of the geomagnetic measured values; to define a number system having a defined number of elements in accordance with the variability of the geomagnetic measured value and of the complex numbers; and to ascertain an availability state of the parking space by ascertaining a root λn of the polynomial λ3−(2n−1)λ2−(n−1)2λ−(n2+1), where n=variability of the geomagnetic measured values, λ=auxiliary variable of the number theory.

## Claims

### Claim at position 1

1-9. (canceled)

### Claim 10

A magnetic parking sensor, comprising:
a detection device configured to detect geomagnetic measured values in a region of a parking space in three coordinates;
a first-in, first-out memory device into which the geomagnetic measured values are loadable, a magnetic variability being ascertainable for a defined number of the magnetic measured values in the first-in, first-out memory device; and
an ascertainment device configured to:
map x and y components of the geomagnetic measured values into complex numbers, the complex numbers being ascertainable depending on the variability of the defined number of the geomagnetic measured values;
define a number system having a defined number of elements in accordance with the variability of the geomagnetic measured values and of the complex numbers; and
ascertain an availability state of the parking space by ascertaining a root λn of a polynomial λ3−(2n−1)λ2−(n−1)2λ−(n2+1)
where
n=variability of the geomagnetic measured values;
λ=auxiliary variable,
such that 2×log(λn)/log(n2+1)>a indicates an occupied state of the parking space, and 2×log(λn)/log(n2+1)<a indicates an unoccupied state of the parking space,
where
a=defined threshold value.

### Claim 11 (depends on 10)

The magnetic parking sensor as recited in claim 10, wherein the three-dimensional geomagnetic measured values are mapped into a defined complex number base b=1−i.

### Claim 12 (depends on 10)

The magnetic parking sensor as recited in claim 10, wherein a calculation is executable using the ascertainment device at defined time intervals.

### Claim 13 (depends on 10)

The magnetic parking sensor as recited in claim 10, wherein the first-in, first-out memory device is configured for a power of two of geomagnetic measured values.

### Claim 14 (depends on 13)

The magnetic parking sensor as recited in claim 13, wherein the first-in, first-out memory device is configured for 128 or 256 or 512 or 1024 measured values.

### Claim 15

A system, comprising:
a defined number of mutually networked magnetic parking sensors, each of the magnetic parking sensors including:
a detection device configured to detect geomagnetic measured values in a region of a parking space in three coordinates,
a first-in, first-out memory device into which the geomagnetic measured values are loadable, a magnetic variability being ascertainable for a defined number of the magnetic measured values in the first-in, first-out memory device, and
an ascertainment device configured to:
map x and y components of the geomagnetic measured values into complex numbers, the complex numbers being ascertainable depending on the variability of the defined number of the geomagnetic measured values,
define a number system having a defined number of elements in accordance with the variability of the geomagnetic measured values and of the complex numbers, and
ascertain an availability state of the parking space by ascertaining a root λn of a polynomial λ3−(2n−1)λ2−(n−1)2λ−(n2+1)
where
n=variability of the geomagnetic measured values;
λ=auxiliary variable,
such that 2×log(λn)/log(n2+1)>a indicates an occupied state of the parking space, and 2×log(λn)/log(n2+1)<a indicates an unoccupied state of the parking space,
where
a=defined threshold value.

### Claim 16

A method for producing a magnetic parking sensor, comprising the following steps:
furnishing a detection device configured to detect geomagnetic measured values in a region of a parking space in three coordinates;
furnishing a first-in, first-out memory device, functionally connected to the detection device, into which x and y components of the geomagnetic measured values are loadable, a magnetic variability of a defined number of the magnetic measured values in the first-in, first-out memory device being ascertainable; and
furnishing an ascertainment device that is functionally connected to the first-in, first-out memory device and is configured to:
map the geomagnetic measured values into complex numbers, the complex numbers being ascertainable depending on the variability of the geomagnetic measured values,
define a number system having a defined number of elements in accordance with the variability of the geomagnetic measured values and of the complex numbers, and
ascertain an availability state of the parking space by ascertaining a root λn of a polynomial λ3−(2n−1)λ2−(n−1)2λ−(n2+1) such that 2×log(λn)/log(n2+1)>a indicates an occupied state of the parking space, and 2×log(λn)/log(n2+1)<a indicates an unoccupied state of the parking space,
where
n=variability of the geomagnetic measured values;
λ=auxiliary variable;
a=defined threshold value determined offline.

### Claim 17

A method for ascertaining an availability state of a parking space, comprising the following steps:
three-dimensionally detecting geomagnetic measured values in a region of a parking space;
constituting x components and y components of the geomagnetic measured values;
loading the x and y components of the geomagnetic measured values into a first-in, first-out memory device;
ascertaining a magnetic variability for a defined number of the geomagnetic measured values in the first-in, first-out memory device;
mapping the geomagnetic measured values into a complex base number, the complex base number being ascertained depending on the variability of the geomagnetic measured values;
defining a number system having a defined number of elements in accordance with the variability of the geomagnetic measured value and of the complex base number; and
ascertaining an availability state of the parking space by ascertaining a root λn of a polynomial λ3−(2n−1)λ2−(n−1)2λ−(n2+1), such that 2×log(λn)/log(n2+1)>a indicates an occupied state of the parking space, and 2×log(λn)/log(n2+1)<a indicates an unoccupied state of the parking space,
where
n=variability of the geomagnetic measured values;
λ=auxiliary variable;
a=defined threshold value.

### Claim 18

A non-transitory computer-readable data medium on which is stored a computer program product having program code for ascertaining an availability state of a parking space, the program code, when executed by a computer, causing the computer to perform the following steps:
three-dimensionally detecting geomagnetic measured values in a region of a parking space;
constituting x components and y components of the geomagnetic measured values;
loading the x and y components of the geomagnetic measured values into a first-in, first-out memory device;
ascertaining a magnetic variability for a defined number of the geomagnetic measured values in the first-in, first-out memory device;
mapping the geomagnetic measured values into a complex base number, the complex base number being ascertained depending on the variability of the geomagnetic measured values;
defining a number system having a defined number of elements in accordance with the variability of the geomagnetic measured value and of the complex base number; and
ascertaining an availability state of the parking space by ascertaining a root λn of a polynomial λ3−(2n−1)λ2−(n−1)2λ−(n2+1), such that 2×log(λn)/log(n2+1)>a indicates an occupied state of the parking space, and 2×log(λn)/log(n2+1)<a indicates an unoccupied state of the parking space,
where
n=variability of the geomagnetic measured values;
λ=auxiliary variable;
a=defined threshold value.