本文選題：衛(wèi)星導航　切入點：差分定位　出處：《南京航空航天大學》2013年碩士論文　論文類型：學位論文

【摘要】：衛(wèi)星導航系統(tǒng)在民用和軍用中發(fā)揮著越來越重要的作用，但由于衛(wèi)星導航的易受干擾性，導致在某些特殊情況下，衛(wèi)星導航定位精度會有所降低甚至完全不可用，導航信號的增強勢在必行。本文設計了兩種衛(wèi)星導航增強的方法，一種是無干擾下的差分增強定位，通過兩個CC50-BG雙系統(tǒng)衛(wèi)星導航模塊獲得的觀測量進行偽距差分數(shù)據(jù)處理，實現(xiàn)了近距差分定位；另一種是有干擾下的衛(wèi)星廣播信號上重疊發(fā)射衛(wèi)星導航校正數(shù)據(jù)和測距信號的異頻增強，將差分校正數(shù)據(jù)經(jīng)過擴頻后發(fā)射出去，與衛(wèi)星廣播信號進行頻譜重疊，一起經(jīng)衛(wèi)星轉(zhuǎn)發(fā)。 第一種方法中，分析CC50-BG衛(wèi)星導航模塊數(shù)據(jù)采集原理及數(shù)據(jù)格式，在Matlab中對采集的數(shù)據(jù)進行讀取，分別生成用戶文件和星歷文件，并利用星歷文件對信號發(fā)射時刻衛(wèi)星位置進行求解，，利用用戶文件中的偽距和時間等觀測量及衛(wèi)星位置進行差分定位，在Matlab中設計出差分定位界面并給出差分定位精度。數(shù)據(jù)表明：在特定的近距實驗測量點，GPS衛(wèi)星平滑差分增強定位對于高度方向的精度改善程度達60%左右。 第二種方法中，分析頻譜重疊原理，擬選用世廣衛(wèi)星信號來掩護差分增強信號，給出兩信號的數(shù)學模型，設計了兩信號頻譜重疊發(fā)射系統(tǒng)。設計出差分接收機，差分接收機通過串行干擾抵消的方法從混合信號中提取出差分增強信號，并用軟件接收機對提取出的信號進行測試。通過參數(shù)設計和性能仿真，可知差分增強信號對廣播信號的接收解調(diào)影響很小，差分接收機對提取出的差分增強信號實現(xiàn)解擴與輔助測距，解擴得到的差分校正數(shù)據(jù)可直接用于差分定位。當混合功率比為26dB時，捕獲概率達99.99%，測距精度為10.67m，表明了此方法的可行性。
[Abstract]:Satellite navigation systems play a more and more important role in civil and military applications. However, due to the vulnerability of satellite navigation to interference, the positioning accuracy of satellite navigation may be reduced or even completely unavailable in some special cases. It is imperative to enhance the navigation signal. In this paper, two methods of satellite navigation enhancement are designed, one is differential enhanced positioning without interference, and the pseudo-range differential data is processed by two CC50-BG dual-system satellite navigation modules. The short distance differential positioning is realized; the other is the enhancement of the different frequencies of the satellite navigation correction data and the ranging signal on the interference satellite broadcast signal, and the differential correction data is transmitted out after spread spectrum. Overlaps the spectrum with the satellite broadcast signal and transmits it together via the satellite. In the first method, the principle and format of data acquisition in CC50-BG satellite navigation module are analyzed. The collected data are read in Matlab, and user files and ephemeris files are generated respectively. The satellite position is solved by ephemeris, and the pseudo-range and time in the user file are used to locate the satellite. The differential positioning interface is designed in Matlab and the accuracy of differential positioning is given. In the second method, the principle of spectrum overlap is analyzed, and the differential enhancement signal is chosen to cover the signal of Shiguang satellite. The mathematical model of the two signals is given, and the spectrum overlapping transmitting system of two signals is designed, and the differential receiver is designed. The differential receiver extracts the differential enhancement signal from the mixed signal by the method of serial interference cancellation, and tests the extracted signal with the software receiver. The difference enhancement signal has little effect on the reception and demodulation of the broadcast signal, and the differential receiver realizes despreading and auxiliary ranging to the extracted differential enhancement signal. When the mixing power ratio is 26dB, the acquisition probability is 99.99m and the ranging accuracy is 10.67m. the feasibility of this method is demonstrated.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4

【參考文獻】

相關(guān)期刊論文 前10條

1 王金剛;;GPS數(shù)字中頻信號仿真及捕獲驗證[J];重慶郵電大學學報(自然科學版);2010年02期

2 彭秀英;郭際明;薛樹強;;GPS單頻偽距相位平滑及其單點定位的精度分析[J];測繪科學;2011年05期

3 何怡,李揚繼;淺析差分GPS的算法及數(shù)據(jù)格式[J];電訊技術(shù);2004年03期

4 張成軍;楊力;陳軍;;提高GPS載波相位平滑偽距定位精度的算法研究[J];大地測量與地球動力學;2009年04期

5 丁子哲;張賢達;;基于串行干擾消除的V-BLAST檢測[J];電子學報;2007年S1期

6 胡榮,黃愛蘋,王洪玉,顧偉康;采用多徑干擾抵消的RAKE接收機[J];電子與信息學報;2002年06期

7 朱云龍;柳重堪;張其善;楊東凱;;一種新的GPS接收機C/A碼跟蹤環(huán)鑒別器算法[J];電子與信息學報;2008年11期

8 唐小妹;黃仰博;王飛雪;;導航接收機中基于反正切鑒別器載波環(huán)路的分析及優(yōu)化設計[J];電子與信息學報;2010年07期

9 張成軍,楊力,鄭航行;基準站坐標偏差對偽距差分定位的影響研究[J];海洋測繪;2004年04期

10 毛悅;宋曉勇;賈小林;吳顯兵;馮來平;;利用C波段轉(zhuǎn)發(fā)數(shù)據(jù)實現(xiàn)GEO衛(wèi)星軌道確定[J];測繪科學技術(shù)學報;2012年03期

本文編號：1640648