Circuit and method for processing ultrasonic echo signal of reversing radar

Abstract

The invention relates to a reversing radar as well as a circuit and method for processing the ultrasonic echo signal of the reversing radar. The circuit comprises a voltage comparator, a timer module and a reference voltage generating module; the negative input end of the voltage comparator is connected with the echo signal input end; the timer module is used for recording the ultrasonic wave propagation time; and the reference voltage generating module is connected with the timer module and used for generating the corresponding reference voltage according to the ultrasonic wave propagation time and outputting the reference voltage to the positive input end of the voltage comparator. The traditional fixed ultrasonic echo comparison is improved and changed into the dynamic adjustable ultrasonic echo comparison comparison, thus when the distance of the obstacle distance is near, the amplitude of the echo signal is high, and the corresponding reference voltage is high, and the distance of the obstacle distance is far, the amplitude of the echo signal is low and the corresponding reference voltage is low. The circuit is simple and has low cost, high flexibility and more stable performance.

Description

technical field [0001] The present invention relates to the backing radar device technology, more specifically, relates to a backing radar ultrasonic echo signal processing circuit, method and backing radar device. Background technique [0002] The ultrasonic signal propagates in the air and attenuates with time. When the obstacle is close to the probe, the strength of the echo signal sent back is strong; when the obstacle is far away from the probe, the echo signal sent back is very weak. The traditional reversing radar device uses a reversing radar ultrasonic echo signal processing circuit such as figure 1 and figure 2 shown. The ultrasonic echo signal is connected to the voltage comparison circuit after passing through the amplification and filtering circuit 90 . Such as figure 1 The medium voltage comparison circuit uses a voltage comparator 10, so the amplified and filtered echo signal is connected to the reverse input terminal of the voltage comparator 10, and the...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to improve an anti-false alarm reversing radar ultrasonic echo signal processing circuit, method and reversing radar device for the defect that the existing reversing radar device is prone to false alarms

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