基于NUC472的超声波信号匹配算法的研究

为了使超声波测距系统中的换能器智能识别自身发出去的信号，以及避免其他设备换能器回波的干扰，提出了一种基于NUC472系列ARM芯片的超声波回波匹配算法的实现方案。详细介绍了各步算法的工作原理和实现过程，构建了发送码元序列的结构，阐述了编解码方式，并利用主控MPU内部ADC单元、FPU计算单元以及DSP指令库完成匹配算法的设计，最后将算法用于板级实验进行性能测试。实验结果表明：此算法不仅能识别多组不同换能器设备，而且方便对于嵌入式系统的移植，具有很强的通用性。

The Research of matching algorithm of Ultrasonic Ranging System based on NUC472

In order to identify the signals of its own and avoid the interference from other devices in the ultrasonic distance measure?ment system,a kind of ultrasonic echo matching algorithm implementation scheme based on ARM chips NUC472 series was came up with. The working principle and realization process of each step algorithm was introduced in detail. Firstly ,the send symbol sequence structure was built and the method of encoding and decoding was expounded. Then,the FPU calculation unit,ADC unit library and DSP instructions in the master MPU were used to complete the design. Finally,the algorithm was used in performance testing experi?ment on board level. Experimental results demonstrate that this algorithm scheme can identify multiple sets of transducer. Meanwhile , it is convenient to the transplantation of the embedded system and advantageous in strong versatility.