METHOD FOR DETECTING A SPECIFIED MOVEMENT PATTERN, ULTRA WIDE-BAND SENSOR DEVICE, AND VEHICLE COMPRISING AN ULTRA WIDE-BAND SENSOR DEVICE
An ultra-wideband sensor transmits impulse radio signals over a predetermined time period, detects echo signals of the impulse radio signals by way of at least one sensor of the ultra-wideband sensor and generates a time-variant channel impulse response that describes the echo signals received by the at least one sensor as a function of a time at which the respective impulse radio signal of the predetermined time period was transmitted and a path delay, uses a predetermined selection method to ascertain at least one ascertained path delay, generates a signal characteristic of the time-variant channel impulse response for the at least one ascertained path delay, uses a predetermined comparison method to determine a similarity of the signal characteristic to a reference characteristic, and detects a predetermined movement pattern associated with the reference characteristic if the similarity meets a predetermined similarity criterion.
1 . A method for recognizing a predetermined movement pattern, comprising:
at an ultra-wideband sensor device:
transmitting impulse radio signals over a predetermined time period,
detecting echo signals of the impulse radio signals by at least one sensor unit of the ultra-wideband sensor device and generating a time-variant channel impulse response that describes the echo signals received by the at least one sensor unit as a function of a time at which the respective impulse radio signal of the predetermined time period was transmitted and a path delay,
ascertaining at least one ascertained path delay using a predetermined selection method,
generating a signal characteristic of the time-variant channel impulse response for the at least one ascertained path delay,
determining a similarity of the signal characteristic to a reference characteristic using a predetermined comparison method, and
if the similarity meets a predetermined similarity criterion, signalling that a predetermined movement pattern associated with the reference characteristic has been detected.
2 . The method as claimed in claim 1 , further comprising:
at the ultra-wideband sensor device:
detecting the predetermined movement pattern only if the respective signal characteristics of at least two sensor units meet the predetermined similarity criterion.
3 . The method as claimed in claim 1 ,
further comprising:
at the ultra-wideband sensor device:
ascertaining a movement locality of the predetermined movement from the at least one ascertained path delay using a predetermined locating method.
4 . The method as claimed in claim 3 , further comprising:
at the ultra-wideband sensor device:
transmitting a predetermined control signal if the movement locality of the predetermined movement pattern is situated in a predetermined local detection area.
5 . The method as claimed in claim 4 , further comprising:
at the ultra-wideband sensor device:
using a predetermined active locating method to detect a key position of an ultra-wideband key, and
specifying the predetermined local detection area based on the key position using a predetermined specification method.
6 . The method as claimed in claim 1 , wherein the signal characteristic is a phase characteristic of a complex channel impulse response.
7 . The method as claimed in claim 4 , wherein the predetermined control signal at least one of unlocks and/or opens a trunk of a vehicle.
8 . The method as claimed in claim 1 , wherein the predetermined comparison method determines the similarity of the signal characteristic to the reference characteristic by computing Euclidean distances between points on the two signal characteristics.
9 . An ultra-wideband sensor device for recognizing a predetermined movement pattern, wherein the ultra-wideband sensor device is configured to:
transmit impulse radio signals over a predetermined time period,
detect echo signals of the impulse radio signals by way of at least one sensor unit of the ultra-wideband sensor device and to generate a time-variant channel impulse response that describes the echo signals received by the at least one sensor unit as a function of a time at which the respective impulse radio signal of the predetermined time period was transmitted and a path delay,
ascertain at least one ascertained path delay using a predetermined selection method,
generate a signal characteristic of the time-variant channel impulse response for the at least one ascertained path delay,
determine a similarity of the signal characteristic to a reference characteristic using a predetermined comparison method, and
signal that a predetermined movement pattern associated with the reference characteristic has been detected if the similarity meets a predetermined similarity criterion.
10 . A vehicle, comprising an ultra-wideband sensor device for recognizing a predetermined movement pattern as claimed in claim 9 .
11 . The method as claimed in claim 2 , further comprising:
at the ultra-wideband sensor device:
ascertaining a movement locality of the predetermined movement from the at least one ascertained path delay using a predetermined locating method.
12 . The method as claimed in claim 11 , further comprising:
at the ultra-wideband sensor device:
transmitting a predetermined control signal if the movement locality of the predetermined movement pattern is situated in a predetermined local detection area.
13 . The method as claimed in claim 12 , further comprising:
at the ultra-wideband sensor device:
using a predetermined active locating method to detect a key position of an ultra-wideband key, and
specifying the predetermined local detection area based on the key position using a predetermined specification method.
14 . The method as claimed in claim 11 , wherein the signal characteristic is a phase characteristic of a complex channel impulse response.
15 . The method as claimed in claim 12 , wherein the predetermined control signal at least one of unlocks and opens a trunk of a vehicle.
16 . The method as claimed in claim 11 , wherein the predetermined comparison method determines the similarity of the signal characteristic to the reference characteristic by computing Euclidean distances between points on the two signal characteristics.