近程毫米波辐射计检测与数据处理

【作者】 黄燕；

【导师】 李跃华；

【作者基本信息】 南京理工大学 ， 信号与信息处理， 2017， 硕士

【摘要】 毫米波辐射计是一种常用的近程被动毫米波探测敏感装置,该装置是用于探测微弱毫米波辐射信号的高灵敏度接收机,特别适合于对近程金属目标的探测与识别,并广泛应用于高效灵巧弹药、被动成像和交通管制等领域。毫米波辐射计的性能检测和标定显得尤为重要。目前通常采用高塔实验或机载实验的方法,但这些实验方式均需要复杂的实验测试设施和大量的实验经费。因此,研究和设计便捷的毫米波辐射计实验测试系统,便于用户更好地进行近程毫米波辐射计实验测试十分重要。详细介绍了毫米波辐射计性能检测系统的设计组成及工作原理。针对毫米波辐射计输出信号波形特征,研究了一种改进的AdaBoost算法,通过设定阈值来修正分类错误样本的权值,最终在高噪声环境下获得较高的识别概率。详细介绍了系统中信号处理模块的硬件和软件设计。硬件设计包括整个模块的硬件工作原理,DSP芯片、A/D转换器和D/A转换器设计、电源、复位电路、JTAG电路和SCI串口通讯电路等。介绍了模块的软件设计,包括发送模块和接收模块。介绍了无线传输模块的整体框架,包括Wi-Fi芯片的选择以及无线传输模块原理。详细介绍了无线传输模块的软硬件设计,主要为Wi-Fi芯片外围电路的设计。并且用LabVIEW设计实现了无线数据采集系统,包括前面板和框图程序的设计。最后对系统进行了实验验证,实验结果表明目标识别算法能对目标进行分类识别,SD卡可以实时存储数据,示波器可以实时监测辐射计数据,并可以通过LabVIEW界面实时监测和回放实验数据。更多还原

【Abstract】 Millimeter wave radiator is a common short-range millimeter wave detector.It is always used as a receiver with high sensitivity to detect the weak millimeter wave signal,especially the detection and recognition of metal targets,which is prevalent in the field of efficient smart ammunition,passive imaging system and traffic control.It is important to test and calibrate the performance of a millimeter wave radiator.Recently,it is popular to conduct the high-tower experiment or airborne experiment,which takes complex experimental facilities and massive experimental funding.Therefore,it is meaningful to design a convenient testing system for millimeter wave radiator.In this article,the basic component and working principle of the performance testing system of millimeter wave radiator have been introduced in detail.According to the character of the millimeter wave radiator signal,a modified AdaBoost algorithm has been analysed by setting a threshold to change the weight of each sample.This algorithm can get a relatively high identification probability.The signal processing module in the whole system has been introduced,including hardware and software design.Hardware design contains the working principle of the whole module,DSP chip,A/D and D/A convertor,power source,reset circuit,JTAG circuit and SCI serial port circuit.Then the software design has been implemented,including transmitting module and receiving module.The whole frame of the wireless transmission module has been introducesd,including the selection of Wi-Fi chip and the working principle.The software and hardware design of the module have been built,including the design of peripheral circuit of Wi-Fi chip.Then,using Lab VIEW to design a wireless data collection system has been designed,including front panel and diagram program.At the end of the article,the function of the testing system has been illustrated.The experiment results show that the object identification algorithm can identify and classify targets accurately;the SD card can store data;oscilloscope can record the data in real time and Lab VIEW interface can monitor and playback experimental data.更多还原