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Anti-floor sweeping signal interference method and device for car backing radar

A technology of signal interference and reversing radar, which is applied in the direction of measuring devices, sound wave re-radiation, and re-radiation, can solve the problems of inconvenient use of reversing radar, misjudgment of ground echoes as obstacles, false alarms, etc., and reduce installation costs. cost, improved accuracy, and the effect of avoiding false alarms

Inactive Publication Date: 2007-01-24
HARBIN INST OF TECH AT WEIHAI
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AI Technical Summary

Problems solved by technology

When the probe installation angle deviation or other reasons cause the ultrasonic beam to sweep the ground (detect the ground), the ground echo will be misjudged as an obstacle, and a false alarm will occur
As a result, a series of problems in engineering applications, such as the need to fine-tune the installation angle of the probe during installation, cannot meet the requirements of mass production and rapid assembly
In addition, when a gentle slope behind is detected, a false alarm may also be generated, causing inconvenience to the user of the reversing radar

Method used

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  • Anti-floor sweeping signal interference method and device for car backing radar
  • Anti-floor sweeping signal interference method and device for car backing radar
  • Anti-floor sweeping signal interference method and device for car backing radar

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Embodiment Construction

[0028] The invention relates to a reversing radar anti-sweeping signal interference method, said method comprising the following steps:

[0029] a) Acquisition step: After each echo signal is amplified, use an A / D sampler to sample the echo signals of all distance units and convert it into a digital signal;

[0030] b) storage step: storing the sampling results of all distance units in the memory;

[0031] c) Suppression step: use the constant false alarm method to process these sampling results to suppress the sweeping signal interference;

[0032] d) Ranging step: performing target ranging on the echo signal suppressed from sweeping signal interference.

[0033] For different practical applications, specific constant false alarm methods can be adopted: direct averaging method or two-sided selection large average method or two-sided interval selection large average method. Among them: the direct averaging method uses the signals of M sampling points before and after the cur...

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Abstract

The method includes steps: collecting, storing, restraining, and ranging. The equipment includes signal generation unit, matched output circuit, send receive gate circuit, ultrasonic probe, amplification / video detection circuit, distance indication circuit, audible and visual alarm circuit as well as collecting unit, storing unit, unit of restraining signal of scanning ground, and ranging unit connected in sequence after the detection circuit. The unit of restraining signal of scanning ground removes influence of signal of scanning ground for the received signal passed through amplification and A / D sampling. Thus, no matter whether the signal of scanning ground is existed or not, the invention guarantees carrying out ranging and alarming operations for signal from barrier. The invention solves issue of error alarming caused by beam of scanning ground (including gently rolling country), providing features of simple method, practicality, and raised reliability.

Description

technical field [0001] The invention relates to a method and device for anti-sweeping signal interference of automobile reversing ranging equipment, in particular to a method and device for anti-sweeping signal interference of a reversing radar. Background technique [0002] At present, the known reversing radar products use a group of ultrasonic probes to emit narrow pulses, and determine the distance of obstacles by measuring the time interval between the reflected pulse and the emitted pulse. When the deviation of the installation angle of the probe or other reasons cause the ultrasonic beam to sweep the ground (detect the ground), the ground echo will be misjudged as an obstacle, and a false alarm will occur. This brings about a series of problems in engineering applications, such as the need to fine-tune the installation angle of the probe during installation, which cannot meet the requirements of mass production and assembly. In addition, when a gentle slope behind is...

Claims

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Application Information

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IPC IPC(8): G01S7/537G01S15/93
Inventor 毛兴鹏
Owner HARBIN INST OF TECH AT WEIHAI
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