本文選題：BDS + BOC�。� 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：北斗衛(wèi)星導(dǎo)航系統(tǒng)簡稱北斗系統(tǒng)(BeiDou Navigation Satellite System,簡稱BDS), BDS是繼美全球定位系統(tǒng)(GPS)、俄GLONASS以及歐盟的Galileo之后,我國自行研制開發(fā)的衛(wèi)星導(dǎo)航系統(tǒng)。 首先對BDS信號的特點及調(diào)制方式進行了研究,通過與傳統(tǒng)BPSK信號的對比,分析研究了BOC信號調(diào)制方式的相關(guān)函數(shù)、功率譜密度等特點。雖然BOC相關(guān)函數(shù)峰值陡峭可以提高捕獲精度,但是會出現(xiàn)多峰現(xiàn)象,因此,研究消除多峰的算法來提高精度是捕獲階段的一個主要研究問題。接著重點對ASPeCT方法進行深入研究,通過仿真實驗論證其可以有效消除捕獲的多峰現(xiàn)象及提高捕獲精度。同時,利用ASPeCT技術(shù),還可以消除鑒相模糊點。最后,通過實驗對比論證了利用三次樣條插值可以有效提高捕獲精度。 在跟蹤階段,深入研究了載波環(huán)和碼環(huán)。重點研究了載波環(huán)中的鎖相環(huán)(PLL)和鎖頻環(huán)(FLL)和環(huán)路階數(shù)的選擇對跟蹤過程的影響,以及碼環(huán)的延遲鎖定環(huán)路原理(DLL)。在這兩個反饋調(diào)節(jié)環(huán)路中,針對環(huán)路動態(tài)性、噪聲等影響因素,研究了帶寬和環(huán)路階數(shù),并且詳細分析研究信噪比、鑒相方式和積分時問對環(huán)路的影響。通過ASPeCT技術(shù)對鑒相器進行設(shè)計,實驗驗證其可以消除鑒相結(jié)果出現(xiàn)的跟蹤模糊點問題從而提高跟蹤精度。最后,通過模擬實驗,對比研究了二階FLL輔助三階PLL和傳統(tǒng)二階PLL鎖相環(huán)的跟蹤多普勒頻移、鑒別器碼相位誤差和即時相關(guān)峰輸出等圖形,得出使用二階FLL輔助三階PLL可以提高跟蹤性能。
[Abstract]:The Beidou satellite navigation system is called the BeiDou Navigation Satellite System (BDS), and BDS is a satellite navigation system developed by our country after the United States global positioning system (GPS), Russia GLONASS and the European Union Galileo.
Firstly, the characteristics and modulation modes of BDS signal are studied. By comparing with the traditional BPSK signal, the correlation function of the modulation mode of the BOC signal and the power spectrum density are analyzed and studied. Although the peak of the BOC correlation function is steep, the acquisition precision can be improved, but the multi peak phenomenon will appear. Therefore, the algorithm to eliminate the multi peak is improved. The precision is a major problem in the acquisition stage. Then, the ASPeCT method is deeply studied. Through the simulation experiment, it is proved that it can effectively eliminate the captured multi peak phenomenon and improve the acquisition precision. At the same time, using the ASPeCT technology, the phase discrimination fuzzy points can be eliminated. Finally, the three spline interpolation is proved by the experimental comparison. The acquisition precision can be improved effectively.
In the tracking stage, the carrier ring and the code ring are deeply studied. The influence of the selection of phase locked loop (PLL) and frequency lock loop (FLL) and loop order in the carrier ring on the tracking process and the principle of the delay locking loop (DLL) of the code ring are studied. In these two feedback loops, the bandwidth is studied for the influence factors of the loop dynamics and noise. And the loop order, and detailed analysis of the signal-to-noise ratio, phase detection method and the influence of the integral time on the loop. Through the ASPeCT technology, the phase detector is designed. The experiment proves that it can eliminate the tracking fuzzy point problem appearing in the phase detection result so as to improve the tracking precision. Finally, the two order FLL auxiliary three order PLL is compared through the simulation experiment. With the traditional two order PLL phase locked loop tracking Doppler frequency shift, discriminator code phase error and instant correlation peak output, it is concluded that the use of two order FLL assisted three order PLL can improve the tracking performance.
【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】：2014
【分類號】：TN96.1

【參考文獻】

相關(guān)期刊論文 前10條

1 呂偉;朱建軍;;北斗衛(wèi)星導(dǎo)航系統(tǒng)發(fā)展綜述[J];地礦測繪;2007年03期

2 李金海;巴曉輝;SHERAZ Anjum;陳杰;;基于自適應(yīng)鎖相環(huán)的高動態(tài)GPS信號載波跟蹤算法[J];電子器件;2007年04期

3 楊東凱;劉憲陽;;低信噪比條件下BOC信號的快捕算法研究[J];中北大學(xué)學(xué)報(自然科學(xué)版);2008年03期

4 王先發(fā);禹化龍;張碧雄;;我國未來衛(wèi)星導(dǎo)航信號的優(yōu)先選擇——BOC調(diào)制信號[J];中國電子科學(xué)研究院學(xué)報;2009年03期

5 劉春德;馮永新;;基于BOC調(diào)制技術(shù)的高動態(tài)GPS接收機研究[J];沈陽理工大學(xué)學(xué)報;2008年02期

6 趙海龍;張健;周R，

本文編號：1928776