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Method and surroundings detection device for determining the position and/or the movement of at least one object in the surroundings of a mobility aid using at least one acoustic pulse

A technology of surrounding environment and detection equipment, applied in the direction of measuring device, sound wave re-radiation, utilization of re-radiation, etc., can solve the problem of short propagation time and achieve the effect of correction

Active Publication Date: 2014-09-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is described here that the distance measurement signal emitted after the test has a propagation time that is 0.6 ms shorter than without the test, thus resulting in a compensable measurement error of approximately 15 cm

Method used

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  • Method and surroundings detection device for determining the position and/or the movement of at least one object in the surroundings of a mobility aid using at least one acoustic pulse
  • Method and surroundings detection device for determining the position and/or the movement of at least one object in the surroundings of a mobility aid using at least one acoustic pulse
  • Method and surroundings detection device for determining the position and/or the movement of at least one object in the surroundings of a mobility aid using at least one acoustic pulse

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Embodiment Construction

[0038] exist figure 1 , 2 , 3a, 3b and 3c always only show the envelope, ie the pulse-shaped modulation signal of the echo signal and its sequence. The display is made clearer by forgoing showing the modulated carrier signal without losing the statement of validity.

[0039] exist figure 1 The profile of the echo amplitude for two echo pulses with a real echo propagation time τ is shown in O and at time t S1 , t S2 Different echo transmission characteristics and equal pulse duration Δτ P and receive filter impulse durations Δτ of equal length F .

[0040] figure 1 Shows the profile of the amplitude A(τ) of the echo of an ideally point-like (ie non-spatially extended) reflected object received by means of a filter, where τ=t-(t S +Δτ P ). Since in practice all transmission channels have a limited bandwidth, in the case of a single point-shaped reflector at the filter output it can always be determined that the echo amplitude A goes back until the echo amplitude A dro...

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Abstract

The invention relates to a method for determining the position and / or the movement of at least one object in the surroundings of a mobility aid using at least one acoustic pulse which is emitted and reflected on the object and which has a specified pulse duration, said reflected acoustic pulse being referred to as an echo pulse. The transit time of the echo pulse and also the position of the object are determined using the point in time at which the amplitude of the received echo pulse first exceeded and / or most recently exceeded at least one specified threshold and using the length of time for which the threshold was exceeded.

Description

technical field [0001] The invention relates to a method and method for determining the position and / or movement of at least one object in the surroundings of a movement assistance device by means of at least one emitted and reflected acoustic pulse having a predetermined pulse duration. Surrounding environment detection equipment. The invention also relates to a vehicle having the surroundings detection device according to the invention. Background technique [0002] Today, in order to detect the vehicle's surroundings acoustically, ultrasonic systems are generally used which measure in pulses, where, from the start of the emission, the emission is short by Δτ p = 0.3 ms signal pulse modulation, usually a sinusoidal carrier signal of 48 kHz. The distance to the object is determined by means of the sound velocity c on the basis of the travel time of the reflection of the pulse on the object in the surroundings. [0003] Especially in the sensors with compensated (abgesetz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/10G01S15/93G01S7/526G01S15/931
CPCG01S7/5276G01S15/101G01S15/931G01S2015/465
Inventor M·卡尔
Owner ROBERT BOSCH GMBH