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Moving body detection device

A technology for moving objects and detection equipment, applied in measuring devices, radio wave measurement systems, mechanical vibration actuation of anti-theft alarms, etc., can solve problems such as increased energy consumption

Inactive Publication Date: 2008-03-26
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the first conventional device includes a microcomputer and needs to acquire a Doppler shift value through an A / D converter, there is a problem of increased power consumption by the A / D converter

Method used

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Examples

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Embodiment Construction

[0029] Fig. 1 shows a mobile object detection device according to a first embodiment of the present invention. The device is of the ultrasonic Doppler type, and includes: an oscillator 10 , a wave transmitter 11 , a wave receiver 12 , a wave detection part 13 , a binary conversion part 14 , a judgment part 15 and a power source 17 .

[0030] For example, oscillator 10 generates 1 The reference signal (electrical signal) E 1 And provide the signal E to the wave transmitter 11 and the wave detection part 13 1 . However, the present invention is not limited thereto, and the energy waves of the present invention may be microwaves or electric waves. In addition, the reference signal (electrical signal) E 1 The waveform can be sinusoidal.

[0031] The wave transmitter 11 is set to: according to the signal E from the oscillator 10 1 The emission has frequency f 1 The sinusoidal ultrasonic wave reaches the detection area. For example, the wave transmitter 11 is composed of an ...

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Abstract

A mobile unit detecting device includes a wave transmitter, a wave receiver, a wave detection unit, a binary conversion unit and a decision unit. The wave transmitter issues an energy wave having a first frequency to a detection region. In response to an energy wave coming from the detection region, the wave receiver issues an electric signal corresponding to the incoming energy wave. The wave detection unit achieves a detection signal from both a reference signal having a first frequency and that electric signal. The binary conversion unit compares the detection signal with a conversion threshold signal to achieve a binary signal. On the basis of this binary signal, the judgement unit judges whether or not a mobile unit approaching or leaving the wave receiver exists in the detection region.

Description

technical field [0001] The present invention relates to a mobile object detection device, in particular to a mobile object detection device for detecting, for example, one or more mobile objects approaching a specified distance in a detection area. Background technique [0002] Such a moving object detection device can be used, for example, as a crime prevention device or the like. For example, Japanese Patent Application No. H09-272402 published on October 21, 1997 discloses an ultrasonic Doppler type vehicle intrusion detection device (hereinafter also referred to as "first conventional device"). The device includes first and second judging means, and is configured to operate intermittently. The first judging means judges whether the Doppler frequency shift value is within a set range for indicating that someone illegally enters the vehicle. Therefore, the apparatus counts the number of times the first judging means judges that the Doppler shift value is within the set r...

Claims

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Application Information

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IPC IPC(8): G01S15/50G08B13/16
Inventor 高木俊昌笠野文宏藤川英彦
Owner MATSUSHITA ELECTRIC WORKS LTD
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