本文選題：單脈沖單通道 + 角跟蹤　； 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：角跟蹤系統(tǒng)是跟蹤與數(shù)據(jù)中繼衛(wèi)星系統(tǒng)的重要組成部分,其可靠的跟蹤能力是完成星間測(cè)控和數(shù)據(jù)傳輸?shù)幕A(chǔ)。目前,常用的跟蹤方式有步進(jìn)跟蹤、圓錐掃描跟蹤和單脈沖跟蹤。單脈沖跟蹤具有跟蹤實(shí)時(shí)性好、星上設(shè)備簡(jiǎn)單、動(dòng)態(tài)滯后小等優(yōu)點(diǎn),是國(guó)內(nèi)外角跟蹤系統(tǒng)的常用實(shí)現(xiàn)方式。在星間鏈路中,信號(hào)信噪比低、多普勒動(dòng)態(tài)范圍大,使得基帶信號(hào)處理技術(shù)成為整個(gè)系統(tǒng)關(guān)注的重點(diǎn)。本論文首先分析了單脈沖單通道角跟蹤系統(tǒng)的基本原理,并進(jìn)行了公式推導(dǎo)。在此基礎(chǔ)上,對(duì)角跟蹤接收機(jī)基帶信號(hào)處理中所用到的載波捕獲與跟蹤技術(shù)、檢波技術(shù)和積累技術(shù)進(jìn)行了研究,并通過仿真驗(yàn)證對(duì)部分算法進(jìn)行了評(píng)估,結(jié)果表明:基于多次FFT聯(lián)合的快速頻率估計(jì)方法可以快速、精確地鎖定目標(biāo)頻率,三階鎖相環(huán)可以無誤差地跟蹤星間鏈路信號(hào)載波,同步檢波在低信噪比條件下具有更好的解調(diào)性能。研究了寬帶數(shù)傳信號(hào)取部分帶寬法的角跟蹤方案,并對(duì)方案進(jìn)行仿真,仿真結(jié)果驗(yàn)證了此種方案的可行性。對(duì)不同調(diào)制方式的信號(hào),在不同信噪比條件下,使用不同的解調(diào)算法進(jìn)行了仿真,并分析比較了仿真結(jié)果,結(jié)果表明:二相調(diào)制方式雖然只能跟蹤單頻信號(hào)但是解調(diào)性能最好。設(shè)計(jì)了單脈沖單通道角跟蹤接收機(jī)的基帶硬件電路;設(shè)計(jì)了基于FPGA的基帶信號(hào)處理方案,并用VHDL語言實(shí)現(xiàn)。搭建了單脈沖單通道角跟蹤接收機(jī)測(cè)試系統(tǒng),并對(duì)設(shè)計(jì)的基帶信號(hào)處理方案進(jìn)行了測(cè)試驗(yàn)證,最終的測(cè)試結(jié)果驗(yàn)證了本文基帶信號(hào)處理方案的可行性和仿真分析的正確性。
[Abstract]:Angle tracking system is an important part of tracking and data relay satellite system. Its reliable tracking ability is the basis of intersatellite measurement and control and data transmission. At present, the commonly used tracking methods are stepwise tracking, conical scanning tracking and monopulse tracking. Monopulse tracking has the advantages of good real-time tracking, simple onboard equipment, small dynamic lag and so on. It is a common way to realize angle tracking system at home and abroad. In the intersatellite link, the signal to noise ratio is low and the Doppler dynamic range is large, which makes the baseband signal processing technology become the focus of the whole system. In this paper, the basic principle of monopulse monopulse angle tracking system is analyzed, and the formula is deduced. On this basis, the carrier acquisition and tracking technology, detection technology and accumulation technology used in baseband signal processing of diagonal tracking receiver are studied, and some of the algorithms are evaluated by simulation. The results show that the fast frequency estimation method based on multiple FFT combination can quickly and accurately lock the target frequency, and the third order PLL can track the signal carrier of the intersatellite link without error. Synchronous detection has better demodulation performance under low signal-to-noise ratio (SNR). The angle tracking scheme of wideband data transmission signal with partial bandwidth method is studied, and the simulation results show that the scheme is feasible. Different demodulation algorithms are used to simulate the signals with different modulation modes under different SNR conditions. The simulation results show that the two-phase modulation can only track single frequency signals but the demodulation performance is the best. The base-band hardware circuit of monopulse mono-channel angular tracking receiver is designed, and the baseband signal processing scheme based on FPGA is designed and realized by VHDL language. A monopulse mono-channel angular tracking receiver test system is built, and the baseband signal processing scheme is tested and verified. The final test results verify the feasibility of the baseband signal processing scheme and the correctness of the simulation analysis.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN927.2

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相關(guān)期刊論文 前8條

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本文編號(hào)：1826763