本文選題：射頻功率計　切入點：有效值功率　出處：《西安科技大學》2012年碩士論文　論文類型：學位論文

【摘要】：目前國內(nèi)功率測試的儀器，大多是臺式機，其價格昂貴、接口復雜、體積大、笨重，不便于攜帶進行外場測試；而手持設備通常功能簡單，不具有臺式功率分析儀的數(shù)據(jù)分析能力，同時不利于組建復雜的測試系統(tǒng)。從而對于便于攜帶同時又具有分析能力且易于組建復雜測試系統(tǒng)的功率測試儀器需求比較旺盛。 通過對市場的調(diào)研和需求分析，以便攜式微波測試儀器的課題研發(fā)為依托，以有效值功率測量為切入點，提出設計一款價格便宜、體積小、重量輕、便于攜帶、易于組建復雜測試系統(tǒng)的基于USB總線的射頻微波功率計。對此功率計所需的功能展開分析，按照虛擬儀器的設計思想，提出功率計系統(tǒng)的總體設計方案。整個系統(tǒng)由兩部分組成，上位機應用軟件系統(tǒng)和USB設備系統(tǒng)。USB設備系統(tǒng)主要負責射頻信號的處理，信號采集以及與上位機通信等功能。應用軟件系統(tǒng)主要完成與功率計USB設備的通信，數(shù)據(jù)的分析處理和顯示以及功率的校準。 本論文主要針對USB設備系統(tǒng)展開研究和設計，USB設備系統(tǒng)由兩部分組成，硬件電路和控制設備進行數(shù)據(jù)采集和數(shù)據(jù)傳輸?shù)墓碳绦�。對于射頻信號的輸入使用50標準SMA頭作為接口，采用可以檢測有效值功率的對數(shù)檢波器實現(xiàn)有效值功率檢測，以ATMEL公司的AVR單片機作為系統(tǒng)的核心控制芯片，，實現(xiàn)數(shù)據(jù)的采集以及與上位機應用軟件系統(tǒng)的USB總線通信。使用Protel99SE對系統(tǒng)的硬件電路原理圖和PCB板進行設計和制作。固件程序是在ATMEL公司所編寫的開發(fā)環(huán)境AVR Studio4.18中使用C語言進行開發(fā)的，C代碼的編譯采用WinAVR進行編譯，使用微控電子開發(fā)的JTAGICE燒寫器給芯片燒寫可執(zhí)行文件，通過串口調(diào)試助手和總線監(jiān)測軟件進行軟件系統(tǒng)的調(diào)試。通過實際的設計和制作，并使用射頻信號源和精密萬用表等測量儀器對檢波部分做測量，測試結(jié)果基本滿足檢波功能要求；使用BusHound總線監(jiān)測軟件對USB總線傳輸進行監(jiān)測，其結(jié)果滿足傳輸要求。最后此硬件設備基本實現(xiàn)了該硬件系統(tǒng)的設計方案。
[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.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TM933.34;TP334.7

【引證文獻】

相關(guān)期刊論文 前1條

1 孫弋;袁曉霞;;有限空間WIFI無線信號覆蓋測量系統(tǒng)設計[J];西安科技大學學報;2013年03期

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