本文關(guān)鍵詞：角誤差信號解調(diào)技術(shù)研究與實(shí)現(xiàn)　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 角誤差信號 四相調(diào)制 同步檢波 包絡(luò)檢波

【摘要】：角誤差信號解調(diào)技術(shù)是衛(wèi)星通信領(lǐng)域中尤其是中繼衛(wèi)星系統(tǒng)中的一項(xiàng)核心技術(shù),該技術(shù)具有較好的實(shí)時跟蹤性,較小的動態(tài)滯后性等優(yōu)點(diǎn)。隨著衛(wèi)星通訊技術(shù)領(lǐng)域的不斷擴(kuò)展,在信噪比低、多普勒變化范圍大、多普勒頻移速率快的條件下,通過數(shù)字方式實(shí)現(xiàn)角誤差信號解調(diào),成為角跟蹤接收機(jī)實(shí)現(xiàn)的難點(diǎn)和重點(diǎn)。本文首先分析了角誤差信號解調(diào)技術(shù)的基本原理,介紹了單脈沖單通道角跟蹤接收機(jī)的基本結(jié)構(gòu)。緊接著提出了角誤差信號解調(diào)的方法,包括同步檢波方法和包絡(luò)檢波方法,并對同步檢波過程中用于載波捕獲的FFT頻率估計(jì)算法和用于載波跟蹤的鎖相環(huán)技術(shù)進(jìn)行了仿真,結(jié)果說明了 FFT頻率估計(jì)算法利于后續(xù)鎖相環(huán)進(jìn)行載波跟蹤,三階鎖相環(huán)能快速準(zhǔn)確跟蹤載波頻率。介紹了四相調(diào)制角跟蹤接收機(jī)的工作原理,重點(diǎn)對四相調(diào)制單載波信號、四相調(diào)制寬帶信號,在不同信噪比條件下進(jìn)行角誤差信號解調(diào)仿真,分析結(jié)果可以看出在低信噪比條件下同步檢波對單載波中頻信號和寬帶中頻信號的解調(diào)性能比包絡(luò)檢波的解調(diào)性能好,而且同步檢波的解調(diào)精度隨著平均累加時間增加而提升。最后給出了角誤差信號解調(diào)數(shù)字處理模塊的硬件設(shè)計(jì),包括系統(tǒng)結(jié)構(gòu)設(shè)計(jì),硬件電路功能設(shè)計(jì),器件選型及配置電路設(shè)計(jì)。搭建測試平臺對角誤差信號解調(diào)數(shù)字處理模塊進(jìn)行測試,并對測試結(jié)果做出分析,結(jié)果表明本課題設(shè)計(jì)的角誤差信號解調(diào)數(shù)字處理模塊的整體性能能夠滿足工程技術(shù)要求,本課題提出的角誤差信號解調(diào)的數(shù)字實(shí)現(xiàn)方法是可行的。
[Abstract]:Angle error signal demodulation is a core technology in satellite communication field, especially in relay satellite system, which has good real-time tracking ability. With the expansion of satellite communication technology, with the low signal-to-noise ratio (SNR), large Doppler range and fast Doppler frequency shift rate. The digital demodulation of angle error signal becomes the difficulty and emphasis of angle tracking receiver. Firstly, the basic principle of angle error signal demodulation technology is analyzed in this paper. The basic structure of monopulse mono-channel angle tracking receiver is introduced, and then the demodulation methods of angle error signal are proposed, including synchronous detection method and envelope detection method. The FFT frequency estimation algorithm used in carrier acquisition and the phase-locked loop technology used in carrier tracking are simulated. The results show that the FFT frequency estimation algorithm is propitious to the subsequent PLL for carrier tracking, and the third-order PLL can track the carrier frequency quickly and accurately. The working principle of the four-phase modulation angle tracking receiver is introduced. The four phase modulation single carrier signal and the four phase modulated wideband signal are emphasized. The angle error signal demodulation simulation is carried out under different SNR conditions. The results show that the demodulation performance of single carrier if signal and wideband intermediate frequency signal is better than that of envelope demodulation under the condition of low signal-to-noise ratio. And the demodulation accuracy of synchronous detection increases with the average accumulated time. Finally, the hardware design of the digital processing module of angle error signal demodulation is given, including system structure design, hardware circuit function design. Device selection and configuration circuit design. Build a test platform for diagonal error signal demodulation digital processing module for testing and analysis of the test results. The results show that the whole performance of the digital processing module of angle error signal demodulation can meet the requirements of engineering technology, and the digital realization method of angle error signal demodulation proposed in this paper is feasible.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN927.2

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