基于USB接口的微波功率计模块研制

发布时间：2018-03-07 16:12

本文选题：射频功率计　切入点：有效值功率　出处：《西安科技大学》2012年硕士论文　论文类型：学位论文

【摘要】：目前国内功率测试的仪器，大多是台式机，其价格昂贵、接口复杂、体积大、笨重，不便于携带进行外场测试；而手持设备通常功能简单，不具有台式功率分析仪的数据分析能力，同时不利于组建复杂的测试系统。从而对于便于携带同时又具有分析能力且易于组建复杂测试系统的功率测试仪器需求比较旺盛。通过对市场的调研和需求分析，以便携式微波测试仪器的课题研发为依托，以有效值功率测量为切入点，提出设计一款价格便宜、体积小、重量轻、便于携带、易于组建复杂测试系统的基于USB总线的射频微波功率计。对此功率计所需的功能展开分析，按照虚拟仪器的设计思想，提出功率计系统的总体设计方案。整个系统由两部分组成，上位机应用软件系统和USB设备系统。USB设备系统主要负责射频信号的处理，信号采集以及与上位机通信等功能。应用软件系统主要完成与功率计USB设备的通信，数据的分析处理和显示以及功率的校准。本论文主要针对USB设备系统展开研究和设计，USB设备系统由两部分组成，硬件电路和控制设备进行数据采集和数据传输的固件程序。对于射频信号的输入使用50标准SMA头作为接口，采用可以检测有效值功率的对数检波器实现有效值功率检测，以ATMEL公司的AVR单片机作为系统的核心控制芯片，，实现数据的采集以及与上位机应用软件系统的USB总线通信。使用Protel99SE对系统的硬件电路原理图和PCB板进行设计和制作。固件程序是在ATMEL公司所编写的开发环境AVR Studio4.18中使用C语言进行开发的，C代码的编译采用WinAVR进行编译，使用微控电子开发的JTAGICE烧写器给芯片烧写可执行文件，通过串口调试助手和总线监测软件进行软件系统的调试。通过实际的设计和制作，并使用射频信号源和精密万用表等测量仪器对检波部分做测量，测试结果基本满足检波功能要求；使用BusHound总线监测软件对USB总线传输进行监测，其结果满足传输要求。最后此硬件设备基本实现了该硬件系统的设计方案。
[Abstract]:At present, most of the domestic power testing instruments are desktop computers, which are expensive, complicated, bulky, bulky, cumbersome and not easy to carry out external field tests, while handheld devices usually have simple functions. It does not have the data analysis ability of desktop power analyzer, and it is not conducive to the construction of complex test system at the same time. Therefore, there is a strong demand for the power test instrument which is easy to carry and has analytical ability and is easy to set up complex test system. Through the market research and demand analysis, based on the research and development of portable microwave test instrument and the effective value power measurement as the breakthrough point, the paper puts forward a design of a cheap, small volume, light weight, easy to carry, RF microwave power meter based on USB bus is easy to set up for complex test system. The function of this power meter is analyzed, and the design idea of virtual instrument is presented. The overall design of the power meter system is put forward. The whole system is composed of two parts. The host computer application software system and the USB device system .USB device system are mainly responsible for the RF signal processing. The application software system mainly completes the communication with the USB equipment of the power meter, the analysis, processing and display of the data and the calibration of the power. This thesis mainly focuses on the research and design of USB device system, which consists of two parts. Hardware circuit and control equipment for data acquisition and data transmission firmware. For RF signal input using 50 standard SMA head as interface, using logarithmic detector which can detect RMS power to realize RMS power detection. The AVR microcontroller of ATMEL Company is used as the core control chip of the system. Data acquisition and communication with USB bus of host computer application software system are realized. The hardware circuit schematic diagram and PCB board of the system are designed and made with Protel99SE. The firmware program is developed in AVR Studio4.18, the development environment of ATMEL Company. The compilation of C code developed in C language is compiled by WinAVR. The JTAGICE burner developed by microcontroller is used to burn the executable file to the chip, and the software system is debugged through serial port debugging assistant and bus monitoring software. The detection part is measured by radio frequency signal source and precision multimeter, and the result basically meets the requirement of detection function, and the transmission of USB bus is monitored by BusHound bus monitoring software. The results meet the transmission requirements. Finally, the hardware system design scheme is basically realized.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TM933.34;TP334.7

【引证文献】