基于优化混沌PWM激励序列的超声测距系统  

Ultrasonic Ranging System Based on Optimized Chaotic PWM Excitation Sequence

作　　者：王俊[1] 白云[1] 高育鹏[1] 彭程[1] 

机构地区：[1]空军工程大学防空反导学院,陕西西安710051

出　　处：《计算机仿真》2015年第12期373-376,共4页Computer Simulation

摘　　要：针对多超声测距系统普遍存在相互串扰和测量精度低的问题,提出一种优化混沌编码的脉冲宽度调制来构造激励序列的方法。采用混沌编码调制载波信号和极性相关法识别回波信号来消除串扰,利用遗传算法优化混沌初值,得到最优的调制激励序列来提高测量精度。再采用现场可编程门阵列作为整个测距系统的核心,用于激励序列的收发和渡越时间的测定。实验结果表明:采用优化后的发射序列可以有效的消除超声串扰并在规定的测距范围内达到较好的测距精度。Aimed at the problem of crosstalk and low accuracy in multi ultrasonic ranging system, the paper pro- posed an optimized chaos coding pulse width modulation method to construct launch sequence. In order to eliminating crosstalk, this method used the chaos coding to modulate carrier signal, and the polarity correlation to recognize the echo signal. The genetic algorithm was applied to optimize the initial value of chaos and obtain the best modulation excitation sequence to increase measurement accuracy. A field programmable gate array （FPGA） chip is the core of ranging system and used to control the transmission and receiving of excitation sequences while achieving the time of flight. Experiments show that the optimized triggering sequence can be used to eliminate the ultrasonic crosstalk and achieve a better accuracy within a specified range.

关 键 词：超声测距 超声串扰 混沌脉宽调制 遗传算法 现场可编程门阵列 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]