摘要： 多传感器超声测距系统工作时存在超声串扰，会导致测量结果失真并降低系统工作效率。为此，利用伪随机序列优越的自相关性，通过对发射信号和回波信号进行互相关运算消除串扰。提出一种利用异或运算代替乘法运算的并行数字相关技术捕获算法。可编程逻辑门阵列(FPGA)仿真结果表明，该算法可以消除实时超声测距系统的串扰和误码干扰，明显减少算法运算量及数据处理时间，提高FPGA逻辑资源利用率及超声测距系统的精度。

关键词: 相关捕获, 伪随机序列, 超声测距, 超声串扰, 可编程逻辑门阵列

Abstract: Ultrasonic crosstalk, which can seriously result in false distance measurement and lessen the work efficiency of ultrasonic distance measurement system, often occurs when multiple transducers work together. Using the cross-correlation characteristic of pseudo-random sequence technique can eliminate the phenomenon of ultrasonic crosstalk by calculating the cross-correlation function of a detected ultrasonic wave and a transmitted ultrasonic wave. A parallel digital correlation algorithm is proposed by using xor and add operation instead of multiplication. The results of Programmable Logic Gate Array(FPGA) simulation demonstrate that the proposed method can eliminate ultrasonic crosstalk and errs, and shorten algorithm computation, the processing time and improve the utilization ratio of FPGA resource, the precision of distance measurement system.

Key words: correlation-capture, pseudo-random sequence, ultrasonic distance measurement, ultrasonic crosstalk, Programmable Logic Gate Array(FPGA)

中图分类号: 

• TP39