In this article, we present a Doppler-effect-compensated ranging system that can be applied to subcentimeter-precision ultrasonic distance measurement for moving targets using a direct sequence spread spectrum (DSSS). First, the theory of the Doppler compensation technique is explained, and then, the evaluation results obtained using maximum-length-sequence coded ultrasonic signals are discussed. In this study, we employ a 128-b DSSS code with three wavelengths per bit. The experimental results demonstrate that the proposed system can measure a target accelerating at 9.8 m/s2 with a speed of up to 2 m/s in the range of 0.1–1.6 m, with a standard deviation of less than 5 mm. We also confirmed by simulation that the system can track a target accelerating at 30 m/s2 with a speed of up to 5.5 m/s in the range of 4–6 m.

中文翻译：

---

具有多普勒效应补偿超声直接序列扩频的移动目标亚厘米精密测距系统

在本文中，我们提出了一种多普勒效应补偿测距系统，该系统可用于使用直接序列扩频 (DSSS) 对移动目标进行亚厘米精度的超声波测距。首先解释了多普勒补偿技术的理论，然后讨论了使用最大长度序列编码的超声信号获得的评估结果。在这项研究中，我们采用了每比特三个波长的 128-b DSSS 代码。实验结果表明，所提出的系统可以在 0.1-1.6 m 范围内测量以 9.8 m/s2 加速的目标，速度可达 2 m/s，标准偏差小于 5 mm。我们还通过仿真证实，该系统可以在 4-6 m 的范围内以高达 5.5 m/s 的速度跟踪以 30 m/s2 加速的目标。