摘要
为了使超声波传感器能在动态环境下定位,要求单超声波接收头能测量多个目标.首先分析了超声波发射头产生的超声波特点,据此推导出接收信号的波形表达式.其次根据接收信号特点,系统标定时用接收信号包络峰值的0.5倍作阈值,而测量时用小阈值,以防止距离信息丢失.最后用C8051F021单片机设计了单接收头多目标测距系统.在2目标与接收头距离之差大于30cm以上时能较精确地测量出2个距离.
A ultrasonic receiver is required to measure a few goals in order to enable localization under the dynamic condition. Firstly the characteristic of ultrasonic from a transmitter is analyzed and then the wave expression of receiving signal is deduced. Secondly a half of receiving signal peak is adopted as threshold in calibrating system and a low threshold is used in measure to avoid losing information. Finally a C8051F021 chip is used to design multi-goal measure system of single receiver. Two distances are measured accurately when the interval of the distances from two goals to the receiver is more than 30 cm.
出处
《传感技术学报》
CAS
CSCD
北大核心
2007年第5期1167-1170,共4页
Chinese Journal of Sensors and Actuators
基金
霍英东教育基金资助项目
国家自然科学基金资助项目(60475034)
关键词
超声波
测量距离
多目标
电路设计
ultrasonic
to measure distances
multi-goal
circuit design
