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Ultrasonic wave space sampling method and monitoring anti-theft device and method based on distance images

A space monitoring and anti-theft device technology, applied in the direction of measuring devices, anti-theft alarms, sound wave reradiation, etc., can solve the problems of short-distance blind spots, signal pulse width, and inability to receive, etc., to reduce the probability of false alarms, high The effect of applying flexibility

Active Publication Date: 2014-12-24
合肥四相至新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large pulse width, such signals cannot be received while being transmitted under the pulse system, and there will be a close-range blind zone when detecting

Method used

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  • Ultrasonic wave space sampling method and monitoring anti-theft device and method based on distance images
  • Ultrasonic wave space sampling method and monitoring anti-theft device and method based on distance images
  • Ultrasonic wave space sampling method and monitoring anti-theft device and method based on distance images

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0138] figure 2 It is an implementation of the present invention. In this embodiment, the controller 1 writes the control word to the waveform generator 2 to generate the required chirp signal and narrow pulse signal. The combination form of chirp signal and narrow pulse signal is as follows: Figure 6 as shown in b. Such as Figure 10 It is a block diagram of the internal structure of a waveform generator, in which the controller 1 controls the timing of the clock and the frequency of the DDS (direct digital frequency synthesizer) K1 , the pulse modulator control word K2 It is controlled to generate a chirp signal in the desired bandwidth range and a narrow pulse signal in the baseband. After the baseband narrow pulse signal is up-converted, it is then filtered by a band-pass filter to obtain the carrier wave as f 0 The narrow pulse radio frequency signal, in which the local oscillator signal required for frequency up-conversion is generated by the frequency synthesiz...

Embodiment 2

[0150] Figure 15 It is another specific implementation manner of the present invention. In this embodiment, the ultrasonic receiving device and the ultrasonic emitting device include a common ultrasonic transducer and a transceiver switch connected with the ultrasonic transducer, and the ultrasonic receiving device also includes a filter amplifier and a separation conversion circuit, and the separation conversion The circuit separates the analog signal output by the filter amplifier into a narrow pulse and a chirp signal, and converts it into a digital signal; the output end of the separation conversion circuit is connected with a digital signal processor;

[0151] The transceiver switch has a transmission path and a reception path, one end of the transmission path and the reception path are respectively connected to the output end of the waveform generator and the input end of the filter amplifier, and the other ends are connected to the ultrasonic transducer.

[0152] Othe...

Embodiment 3

[0167] attached Figure 21 It is an implementation of the present invention. The devices used in this embodiment are except the digital-to-analog converter 5 and the signal separation device 6 . Other device structures are the same as in Example 1. This embodiment adopts the same signal form and distance image generation method as in Embodiment 1. The method in Embodiment 1 or Embodiment 2 can be used in the intrusion detection and alarm part. The specific implementation of the same part will not be repeated here, and the specific implementation of different parts is as follows:

[0168] attached Figure 22 The analog realization structure of the signal separation device 6 is given.

[0169] attached Figure 22 The analog signal separation circuit in the circuit is composed of a four-way power divider and two signal processing modules connected to the four-way power divider, each signal processing module includes two mixing branches, and the mixing branches are composed o...

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Abstract

An ultrasonic wave space monitoring anti-theft device based on distance images comprises a controller, a warning device connected with the controller, a digital signal processor connected with the controller in a data mode and a waveform generator. The waveform generator can generate narrow pulse signals and linear FM signals and is connected with an ultrasonic wave emitting device. The digital signal processor is connected with an ultrasonic wave receiving device. The ultrasonic wave receiving device separates received ultrasonic wave signals into narrow pulse and linear FM signals which are transmitted to the digital signal processor respectively. The invention further discloses an ultrasonic wave space sampling method and a monitoring anti-theft method based on distance images. By forgetting weighted processing and changing position comparison processing, the misinformation probability is lowered, the problem that the ultrasonic wave high range resolution and the long detection range cannot be achieved at the same time is solved, the ultrasonic wave emitting device and the ultrasonic wave receiving device can be placed on one side of a space, and high application flexibility is achieved.

Description

technical field [0001] The invention belongs to the field of electronic communication, and relates to an electronic device for detection by ultrasonic waves, in particular to an ultrasonic space sampling method based on a distance image, a monitoring anti-theft device and a method. Background technique [0002] With the continuous improvement of people's quality of life, the demand for anti-theft of personal, public property and some key items has become increasingly prominent. Generally, property that needs anti-theft protection is usually placed in a relatively fixed and closed space, such as a safe, warehouse, inside a car, and a cargo box. And the existing anti-theft method for relatively fixed and closed space, as the automobile anti-theft method that has been applied in a large number at present, is to judge whether someone is invaded and stolen by the vibration detector. Its basic principle is to measure whether the vibration of the car exceeds a certain threshold, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/181G01S15/88
Inventor 陈祝明王千里杨伟航李帅奇
Owner 合肥四相至新科技有限公司
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