本文選題：頻率掃描 + 頻率測(cè)量��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：一般來(lái)說(shuō),通信信號(hào)在電磁頻譜中主要占據(jù)高頻(HF)、甚高頻(VHF)和特高頻(UHF)等頻段。此外在更低頻率上,有工作在甚低頻(VLF)和低頻(LF)的緊急通信鏈路;在更高的頻率上,衛(wèi)星通信可以工作在X頻段和K頻段,美國(guó)的國(guó)防軍事衛(wèi)星通信系統(tǒng)甚至工作在了20GHz和44GHz。通常而言,對(duì)通信偵查系統(tǒng)的工作頻率范圍要求在2~1000MHz。面對(duì)如此大的頻率覆蓋范圍,若要進(jìn)行全概率接收,實(shí)現(xiàn)難度較大,通常的辦法是進(jìn)行掃頻。頻率測(cè)量幾乎是所有接收機(jī)系統(tǒng)都必須完成的基本任務(wù)。而在數(shù)字域進(jìn)行頻率測(cè)量,則具有測(cè)頻算法靈活多樣、精度高等優(yōu)點(diǎn)。隨著現(xiàn)場(chǎng)可編程門陣列(FPGA)技術(shù)的不斷發(fā)展,其具有的邏輯門陣列和功能模塊也不斷增加,FPGA能完成的功能也越來(lái)越多,其高速、高集成度等優(yōu)點(diǎn)使其在實(shí)時(shí)或準(zhǔn)實(shí)時(shí)的處理場(chǎng)合被廣泛應(yīng)用。本文在掃頻技術(shù)和測(cè)頻技術(shù)的基礎(chǔ)上,搭建了一個(gè)基于FPGA和個(gè)人電腦(PC)的通信信號(hào)頻率掃描和測(cè)量系統(tǒng)平臺(tái),重點(diǎn)研究該系統(tǒng)的各部件設(shè)計(jì)和基于第三代總線(PCIE)的主機(jī)接口,完成了整個(gè)系統(tǒng)的設(shè)計(jì)、實(shí)現(xiàn)和測(cè)試。該系統(tǒng)在FPGA上完成可變帶寬的數(shù)字下變頻、可變點(diǎn)數(shù)的快速傅立葉變換(FFT)、數(shù)字測(cè)頻、主機(jī)接口硬件部分等模塊;在PC上實(shí)現(xiàn)硬件驅(qū)動(dòng)程序和上位機(jī)應(yīng)用程序。最終完成后,在上位機(jī)界面進(jìn)行操作,可以控制整個(gè)系統(tǒng)以最小250KHz,最大20MHz的步進(jìn)帶寬,對(duì)最大20MHz~3.6GHz的頻率范圍進(jìn)行掃描同時(shí)完成對(duì)最大值信號(hào)頻率的測(cè)量。掃描結(jié)果和頻率測(cè)量結(jié)果通過(guò)主機(jī)接口上傳到上位機(jī)界面進(jìn)行顯示。
[Abstract]:Generally speaking, communication signals occupy high frequency (HF), very high frequency (VHF) and ultra-high frequency (UHF) in the electromagnetic spectrum. In addition, at lower frequencies, there are emergency communication links operating at very low frequency (VLF) and low frequency (LF); at higher frequencies, satellite communications can operate in the X-band and K-band, and the US defense military satellite communication system even operates at 20GHz and 44GHz. Generally speaking, the frequency range of communication detection system is required to be in the range of 21000 MHz. In the face of such a large frequency coverage, it is difficult to realize the full probability receiving, the usual method is to sweep the frequency. Frequency measurement is an essential task for almost all receiver systems. The frequency measurement in digital domain has the advantages of flexible frequency measurement algorithm and high precision. With the continuous development of field programmable gate array (FPGA) technology, its logic gate array and functional modules are also increasing the number of functions that can be accomplished by FPGA. High integration makes it widely used in real-time or quasi-real-time processing. On the basis of frequency sweep technology and frequency measurement technology, a communication signal frequency scanning and measuring system platform based on FPGA and personal computer (PC) is built in this paper. The design of each component of the system and the host computer interface based on the third generation bus (PCIE) are studied emphatically. The whole system is designed, implemented and tested. The system implements the modules of variable bandwidth digital down-conversion, variable point fast Fourier transform (FFT), digital frequency measurement, host interface hardware and so on FPGA, and implements hardware driver and host computer application program on PC. After the final completion, the whole system can be controlled with a minimum of 250kHz and a maximum stepping bandwidth of 20MHz, and the maximum frequency range of 20MHz / 3.6GHz can be scanned and the maximum signal frequency can be measured simultaneously. Scan results and frequency measurement results are uploaded to the host computer interface through the host interface for display.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM935.1

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本文編號(hào)：2108888