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Research on the Verification Method of Vehicle Horn Monitoring System
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摘要: 机动车鸣笛监测系统作为非现场执法系统，是交警部门对查处机动车违法鸣笛行为的一种有效执法手段，其抓拍结果的可靠性需要受到广泛关注。从机动车鸣笛监测系统的声源定位算法原理出发，分别对国家检定规程中的检定项目：声压级测量误差、空间分辨力、定位误差、有效识别区域和声光图像时间一致性进行测量。通过分析不同频率不同位置声源的定位结果得到鸣笛监测系统的相关规律，结果表明声压级测量应在消声室进行检定以避免不必要的声反射；空间分辨力在不同频率与分辨角度存在反比例关系；定位误差由于Y方向受距离衰减影响较大，所以Y方向定位误差比X方向大。Abstract: As an off-site law enforcement system, the vehicle horn monitoring system is an effective law enforcement means for the traffic police to investigate and punish the illegal vehicle horn behavior. Based on the principle of the sound source location algorithm of the vehicle horn monitoring system, the measurement error of sound pressure level, spatial resolution, positioning error, effective recognition area and time consistency of acousto-optic image of the verification items in the national verification regulations are measured respectively, by analyzing the location results of different sound sources at different frequencies and positions, the relevant rules of the sound pressure level measurement system are obtained The relationship between wavelength and resolution angle of spatial resolution at different frequencies.
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图 2 声压级测量误差检定示意图
Figure 2. Principle diagram of measurement error verification of sound pressure level
图 3 在消声室中A厂家和B厂家分别3.0 m、3.5 m和4.0 m中的声压级测量误差
Figure 3. Measurement error of sound pressure level in anechoic chamber at 3.0 m, 3.5 m and 4.0 m for factory A and factory B respectively
图 4 在半消声室中A厂家和B厂家分别3.0 m、3.5 m和4.0 m中的声压级测量误差
Figure 4. Measurement error of sound pressure level in semi-anechoic chamber at 3.0 m, 3.5 m and 4.0 m for factory A and factory B respectively
图 6 A厂家和B厂家在不同频率下的空间分辨力
Figure 6. A spatial resolution of Factory A and factory B at different frequencies
图 7 定位误差和有效识别区域试验布置图
Figure 7. Location error and effective identification area test layout
图 8 声光图像时间一致性校准装置
Figure 8. Time consistency calibration device for acousto-optic image
表 1 定位误差和有效识别区域测试结果
Table 1. Test results of positioning error and effective identification region
鸣笛声源
水平距离/m车道 方向 定位误差/m 厂家A 厂家B 15 车道1 X方向 −0.085 0.092 Y方向 0.305 0.475 车道2 X方向 0.095 0.088 Y方向 0.322 0.396 25 车道1 X方向 −0.102 0.122 Y方向 0.722 −0.813 车道2 X方向 −0.095 0.113 Y方向 0.705 −0.786 35 车道1 X方向 0.135 0.157 Y方向 0.882 0.963 车道2 X方向 0.136 0.145 Y方向 0.903 0.988 
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表 2 厂家A在不同距离下的声光图像时间一致性
Table 2. The time consistency of a in different distance
距离/m 15 25 35 声光时间图像
时间一致性/ms第1次 20 32 18 第2次 26 45 22 第3次 32 28 38 平均值 26 35 26
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表 3 厂家B在不同距离下的声光图像时间一致性
Table 3. The time consistency of acousto-optic image in different distance
距离/m 15 25 35 声光时间图像
时间一致性/ms第1次 33 22 46 第2次 35 26 25 第3次 46 38 54 平均值 38 29 42
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