扩频法超声测距中的渡越时间的确定  

Time of Flight Capture in Spread Spectrum Method for Ultrasonic Distance Measurement

作　　者：黄增荣[1] 秦会斌[1] 黄博志[1] 礼攀[2] 胡秀江[1] 

机构地区：[1]杭州电子科技大学新型电子器件与应用研究所,浙江杭州310018 [2]中国电子科技集团第52研究所,浙江杭州310012

出　　处：《计量学报》2007年第3期280-283,共4页Acta Metrologica Sinica

基　　金：国家自然科学基金(60671024;60601022);浙江省自然科学基金重大项目(Z104621)

摘　　要：基于对扩频技术在雷达系统中的应用和数字相关器进行的研究,提出一种扩频法超声波测距中渡越时间捕获的方法。适当选择的一个伪随机序列信号,经超声传感器调制发射。然后通过数字相关方法求出发射序列和接收序列的相位差,即渡越时间。在计算自相关函数时用并行数字相关技术代替傅里叶变换算法,这样显著地减少了数据处理时间和现场可编程门阵列(FPGA)资源。系统以Altera公司的quartusⅡ软件为开发平台,经逻辑综合、布局布线后,适配到FPGA芯片中,给出了仿真结果。Based on the research on digital correlator and spread spectrum technology used in radar system, a method of time of flight （tof） capture in spread spectrum method for ultrasonic distance measurement is proposed. An appropriate pseudo random number is modulated by ultrasonic sensor and transmitted. The time of flight can be got by using digital correlation approach to find the phase difference between transmitting sequence and receiving sequence. The correlation function is computed by parallel digital correlation technology using XOR and addition operation taking place of FFT algorithm using multiplication. This method shortens the processing time and FPGA resource. The system design is based on Aletra＇ s quartus Ⅱ software, and fitted to FPGA chip after logic synthesizing and placement routing. The timing simulation results in placement and routing is also presented.

关 键 词：计量学 超声测距 扩频技术 渡越时间 数字相关器 

分 类 号：TB95[一般工业技术—计量学]