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  本文選題：相位重合檢測　切入點：相位抖動　出處：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：相位噪聲是衡量頻率標(biāo)準(zhǔn)源和現(xiàn)代電子設(shè)備的重要技術(shù)指標(biāo),在基本頻率源的特性的研究以及性能的測試中的重要性日益增加。本文根據(jù)周期信號間的相位周期性變化規(guī)律,利用相位重合檢測技術(shù),實現(xiàn)了高分辨率的相位噪聲測量。通過對周期性信號間的相位關(guān)系的深入研究,為相位重合檢測模糊區(qū)提供了理論的基礎(chǔ)。重合檢測電路的設(shè)計中,由于相位重合檢測線路存在一定的分辨率,在輸入的兩信號的相位差小于一定的值時,實現(xiàn)了重合脈沖的輸出。該技術(shù)能夠?qū)崿F(xiàn)利用單一的參考源就可完成寬范圍內(nèi)的任意頻率信號的的快響應(yīng)時間、高分辨率的相位噪聲測量,不同于傳統(tǒng)的基于復(fù)雜電路設(shè)計的相位噪聲測量系統(tǒng),不僅節(jié)約了成本,而且提高了測量精度。相位噪聲的測量分為近端和遠(yuǎn)端之分,具體設(shè)計如下:1、在近端相位噪聲測量系統(tǒng)設(shè)計中,其原理是通過對閘門內(nèi)計數(shù)值的起伏變化,利用對相位重合點之間的信號進行無間隙計數(shù)及重合脈沖簇的包絡(luò)狀況來提取相位抖動,經(jīng)過間接的轉(zhuǎn)換方式,最終實現(xiàn)將相位抖動轉(zhuǎn)換為單邊帶相位噪聲。2、對于遠(yuǎn)端相位噪聲的測量,本文提出了基于相位重合檢測模糊區(qū)特征的相位噪聲測量方法,這是一種全新的測量方法。在參考和被測信號的標(biāo)稱頻率相同或者成倍數(shù)并帶有微小偏差時,兩信號間的相位差變化的單調(diào)性,所以這些重合脈沖是集中出現(xiàn)的,呈現(xiàn)出一種包絡(luò)形狀的模糊區(qū)。重合檢測線路的分辨率是穩(wěn)定的,所以重合檢測模糊區(qū)是相對穩(wěn)定的。同時,模糊區(qū)又存在著細(xì)微的變化,這是由相位噪聲引起的。因此,利用重合檢測模糊區(qū)可以提取噪聲引起的相位抖動信息。維納辛欽定理是實現(xiàn)相位噪聲測量的算法基礎(chǔ),這個定理描述了從相位抖動轉(zhuǎn)化為相位噪聲的過程,其中經(jīng)歷了自相關(guān)和快速傅立葉變換。文中詳細(xì)介紹了相位抖動的提取和轉(zhuǎn)化為單邊帶相位噪聲的過程,以及相位噪聲測量系統(tǒng)的硬件和軟件實現(xiàn)。硬件主要包括信號的整形放大、電平轉(zhuǎn)換以及重合檢測。軟件主要是基于LabVIEW的相位抖動提取和到相位噪聲的轉(zhuǎn)換。同時,利用這一系統(tǒng)對頻率源的相位噪聲進行測量,并將其測量結(jié)果和PN8010的進行比較和分析,找出其中的不足,然后進行適當(dāng)?shù)母倪M。
[Abstract]:Phase noise is an important technical index to measure the frequency standard source and modern electronic equipment. It is becoming more and more important in the study of the characteristics of the basic frequency source and the testing of the performance of the basic frequency source.Based on the periodic variation of phase between periodic signals, the phase noise measurement with high resolution is realized by using phase coincidence detection technique.The phase relationship between periodic signals is studied in depth, which provides a theoretical basis for phase coincidence detection of fuzzy regions.In the design of the coincidence detection circuit, because of the certain resolution of the phase coincidence detection circuit, the output of the coincidence pulse is realized when the phase difference of the two input signals is less than a certain value.This technique can realize the fast response time and high resolution phase noise measurement of a wide range of arbitrary frequency signals by using a single reference source, which is different from the traditional phase noise measurement system based on complex circuits.It not only saves the cost, but also improves the measuring accuracy.The measurement of phase noise is divided into the near end and the far end. The specific design is as follows: 1. In the design of the near end phase noise measurement system, the principle is to change the counting value in the gate by fluctuation.The phase jitter is extracted by counting the signals between the phase coincidence points without gaps and the envelope of the overlapped pulse clusters.Finally, the phase jitter is converted to single sideband phase noise. For the measurement of remote phase noise, a phase noise measurement method based on phase coincidence detection fuzzy region feature is proposed in this paper, which is a new measurement method.When the nominal frequency of the reference and measured signals is the same or multiple and with small deviations, the phase difference between the two signals varies monotonously, so these overlapped pulses are concentrated and present a fuzzy region with an envelope shape.The resolution of coincidence detection line is stable, so the fuzzy area of coincidence detection is relatively stable.At the same time, there is a slight change in the fuzzy region, which is caused by phase noise.Therefore, the phase jitter information caused by noise can be extracted by using coincidence detection fuzzy region.The Wiener Sinchin theorem is the basis of the algorithm for phase noise measurement. This theorem describes the process from phase jitter to phase noise, which has experienced autocorrelation and fast Fourier transform.In this paper, the process of phase jitter extraction and transformation into single sideband phase noise, and the hardware and software implementation of phase noise measurement system are introduced in detail.Hardware includes signal shaping and amplification, level conversion and coincidence detection.The software is mainly based on LabVIEW phase jitter extraction and phase noise conversion.At the same time, the system is used to measure the phase noise of the frequency source, and the results of the measurement are compared and analyzed with PN8010 to find out the shortcomings, and then make appropriate improvement.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM933.312

【共引文獻】

相關(guān)期刊論文 前1條

1 魯峗;周波;;相位噪聲測量方法與實驗分析[J];上海電機學(xué)院學(xué)報;2011年06期

相關(guān)碩士學(xué)位論文 前2條

1 王輝;短波低截獲概率通信信號的檢測與調(diào)制識別[D];解放軍信息工程大學(xué);2013年

2 宋慧敏;基于相位重合檢測的相位噪聲測量算法研究[D];西安電子科技大學(xué);2014年

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本文編號：1713078