摘要
本电路首先将220V交流电变为12V直流电压来为整机供电,并应用气敏传感器MQ-2把瓦斯气体浓度这一非电量转换为电信号,再经由运算放大器μA709将该信号与门限电压比较,由电压比较器转化为数字信号并控制由LM555数模集成电路组成的双稳态触发电路最后应用继电器来控制报警电路和通风设备,从而实现报警。
AMicro-Doppler signature produced by micro-motion contains movement and structure information which is useful for radar classification and recognition. Aimed at the recognition problem of ordinary chariot wheel in ground battle, the motion dynamics and echo models of the ordinary chariot wheel in single frequency are set up. And the micro-Doppler modulation of the chariot wheel is quantitatively analysesed. Then, based on SPWV time-frequency analysis, the corresponding micro-Doppler feature is extracted. Finally, simulation demonstrates the validity of the theoretical analysis and the effectiveness of the extracting method.
出处
《电子设计工程》
2014年第1期14-16,共3页
Electronic Design Engineering
基金
西安市科技计划项目(CXY1352WL25)
关键词
微多普勒
战车车轮
旋转
时频分析
micro-Doppler
chariot wheel
rotation
time-frequency analysis
