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Method and system for allowing parking sensor to resist interference

A technology of reversing radar and interference wave, applied in the field of signal data processing, can solve problems such as limited function, false alarm, and misjudgment, and achieve the effect of improving alarm accuracy and accurate alarm.

Active Publication Date: 2014-02-26
SHENZHEN HANGSHENG ELECTRONICS
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AI Technical Summary

Problems solved by technology

[0006] The above processing can improve the anti-interference performance of the radar system to a certain extent, but it has limited effect on the same-frequency sound interference (such as car horns, key throwing, etc.)
[0007] The reason is that the frequency of part of the interference source and the frequency of the ultrasonic wave are in the same frequency band, and the interference signal and the reflected signal of the obstacle are amplified, shaped, and detected without loss; finally, the interference signal and the obstacle cannot be distinguished, resulting in misjudgment and misjudgment. Call the police

Method used

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  • Method and system for allowing parking sensor to resist interference

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Embodiment Construction

[0053] The invention discloses an anti-jamming method for a reversing radar, comprising:

[0054]Interference wave detection: Before the ultrasonic sensor detects obstacles, count the number of pulses with set intensity interference at the MCU echo signal end within the set time, and determine whether the interference is strong by accumulating the number of interference pulses; if the interference When the interference is not strong or there is no interference, drive the ultrasonic sensor to work according to the normal detection sequence; when the interference is strong, the number of detections during the driving of the ultrasonic sensor is increased; if the interference is very strong, the interference signal has completely covered or destroyed the obstacle signal Turn off the ranging function of the radar and stop the buzzer alarm;

[0055] Obstacle detection: Add a random delay in the process of detecting obstacles by the ultrasonic sensor to distinguish obstacles and int...

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Abstract

The invention provides a method and system for allowing a parking sensor to resist interference. The method for allowing the parking senor to resist interference includes the steps of detecting interference waves, namely, counting pulses with set strength interference at an MCU back wave signal end in a set period of time before an obstacle is detected by an ultrasonic transducer, and judging whether the interference is strong or not according to the number of counted interference pulses; detecting the obstacle, namely, prolonging random delay so as to distinguish the obstacle from the interference waves when the ultrasonic transducer detects the obstacle. The method and system for allowing the parking sensor to resist interference have the advantages that interference signals and the obstacle are effectively distinguished, and therefore an alarm is accurately given, and the alarm accuracy is improved.

Description

technical field [0001] The invention relates to the field of signal data processing, in particular to an anti-jamming method and system for a reversing radar. Background technique [0002] The basic working principle of the ultrasonic reversing radar: the controller drives the ultrasonic sensor (integrated transceiver) through the MCU to send a short, fixed-frequency ultrasonic signal. When the ultrasonic pulse encounters an obstacle, it will reflect, and the sensor will The reflected echo will be received. After the echo signal is amplified, filtered, and detected, the controller MCU will use the time interval between transmitting the ultrasonic wave and receiving the reflected echo (the propagation speed of the ultrasonic wave in the air at room temperature is constant, About 340 m / s), calculate the distance between the sensor and the obstacle, and send out alarm sounds with different urgency according to different distances. [0003] In the reversing radar system, the ul...

Claims

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Application Information

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IPC IPC(8): G01S7/52
CPCG01S7/537G01S15/931
Inventor 唐江孙立华黎中有
Owner SHENZHEN HANGSHENG ELECTRONICS
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