| 赵治俊,王选择,张雨,王科,罗应瑞,翟中生.超声动态测距的一种直接数字解调处理方法*[J].,2017,36(2):155-161 |
| 超声动态测距的一种直接数字解调处理方法* |
| A direct digital demodulation method for dynamic ultrasonic distance measurement |
| 投稿时间：2016-05-05 修订日期：2017-02-22 |
| 中文摘要: |
| 为了减少传统的相位差超声动态测距的复杂性，提出了一种基于直接数字解调的信号处理方法。运用STM32内部两路 A/D同步采集超声测量信号与参考信号，对这两组信号数据通过最小二乘椭圆拟合方法，计算 [?π; π] 单周期范围内的实时相位差。在此基础上，对实时相位差进行解包裹运算，得到绝对相位差。最后，通过绝对相位差的变化量与距离变化量成正比的关系，计算出实时的动态变化距离值。实验结果表明：当目标速度不超过 2.5 m/s时，该方法能够准确地将距离值直接解调出来，满足动态变化条件下跟踪测距要求。 |
| 英文摘要: |
| In order to simplify the traditional dynamic ultrasonic distance measurement system by phase
difference, a signal-processing method based on direct digital demodulation is proposed in this article. Specifically, two internal A/D of the STM32 are used to collect the ultrasonic metrical signal and reference signal synchronously. Then the two sets of signal data are fitted using the least square ellipse fitting method in order to calculate the real-time phase difference in one-period([?π; π]). Based on the real-time phase difference, the absolute phase difference can be calculated, using the unwrapping algorithm. Finally, the real time dynamic changing of distance is obtained base on the proportion relationship between the change of phase difference and the change of distance. The results of the experiment indicate that when the speed of the target is less than 2.5 m/s, the method proposed in this article can accurately track the change of distance, which meets the requirement of dynamic distance tracking and calculating. |
| DOI：10.11684/j.issn.1000-310X.2017.02.010 |
| 中文关键词: 数字解调 超声测距 椭圆拟合 相位差 解包裹 |
| 英文关键词: Digital demodulation Ultrasonic Ranging ellipse fitting phase difference unwrapping |
| 基金项目:国家自然科学基金 (51275157, 51275158, 51575164), 湖北省科技支撑计划项目 (2015BCE047) |
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