Magnetic parking sensor

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.

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.

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.

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.

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.