Method and apparatus for detecting single-sent and multi-received barrier

A receiving method and multi-party technology, which can be used in measurement devices, using re-radiation, and re-radiation of sound waves, which can solve problems such as hidden safety hazards and late detection.

Active Publication Date: 2008-11-12
COLIGEN CHINA
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Problems solved by technology

If the reversing speed is 20km/hr at this time, then after 240ms, the vehicle has backed up by 1

Method used

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  • Method and apparatus for detecting single-sent and multi-received barrier
  • Method and apparatus for detecting single-sent and multi-received barrier
  • Method and apparatus for detecting single-sent and multi-received barrier

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Embodiment Construction

[0037] like figure 1 As shown, it is a schematic diagram of the reversing radar set at the rear of the vehicle 20 according to the present invention. In this embodiment, the reversing radar device includes a main controller (not shown in the figure) and four ultrasonic sensors 12a-12d, such as image 3 As shown, it is a timing diagram for the main controller to control the four ultrasonic sensors 12a-12d, and Figure 4 It is a schematic diagram of the waveforms of the four ultrasonic sensors 12a-12d when an echo signal is received by the four ultrasonic sensors 12a-12d.

[0038] The main controller of the present invention presets a time period, and stores the distance value between adjacent ultrasonic sensors installed on the vehicle, which is set by image 3 It can be seen from A to D that the main controller periodically controls the first to fourth ultrasonic sensors 12a to 12d to emit ultrasonic detection signals in sequence; that is, in the first time period 0 to T1, on...

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Abstract

The invention provides a method for detecting the obstacles of the unilateral emission and multiple receiving of a reverse sensor and a device thereof. When in a unilateral time period, only a unilateral ultrasonic sensor is allowed to emit an ultrasonic signal and all ultrasonic sensors are led to be in a receiving state at the same time; when the echo signal of an ultrasonic detecting signal is reflected, at least two groups of ultrasonic sensors can receive the echo signal, and therefore a main controller can calculate the distance between the ultrasonic sensors and the obstacles according to the transmission time between the emission and receiving of each echo signal and calculates the distance between the rear of cars and the obstacles with trigonometric function according to the known distance between adjacent ultrasonic sensors. Therefore, the method can not only reduce situations of late alarming caused by time-shared detection, but also prevent the ultrasonic signals emitted at the same time from interfering in other ultrasonic sensors and relatively promote the correctness of detection.

Description

technical field [0001] The invention relates to a method and a device for detecting obstacles of a reversing radar, in particular to a method and device for detecting obstacles using unilateral transmission and multi-party reception. Background technique [0002] At present, the reversing radar can be divided into infrared detection type reversing radar and ultrasonic reversing radar according to its detector type, among which the ultrasonic reversing radar is more common. When the ultrasonic sensor emits an ultrasonic signal, due to the characteristics of the ultrasonic wave, the ultrasonic signal will spread out and take the shape of a horn after it is emitted from the ultrasonic sensor. Therefore, it can be used to detect the existence of obstacles in a wide range. . [0003] Because the ultrasonic signal is transmitted in the air in the shape of a horn, it is easy to cause interference when applied to a large vehicle with multiple ultrasonic sensors. Generally speaking...

Claims

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Application Information

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IPC IPC(8): G01S15/08G01S15/93
Inventor 李世雄
Owner COLIGEN CHINA
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