本文關(guān)鍵詞： 北斗雙頻接收機(jī) 熱啟動 首次定位時間 比特跳變 快速捕獲　出處：《北京理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國自主研發(fā)的北斗衛(wèi)星導(dǎo)航系統(tǒng)的不斷完善以及包含北斗B1與B2民用頻段信號信息的空間信號接口控制文件公布,北斗雙頻接收機(jī)因其定位精度高的特點,也得到廣泛應(yīng)用。熱啟動是最為常用的一種接收機(jī)啟動方式,隨著技術(shù)的發(fā)展,用戶對于接收機(jī)熱啟動速度和精度要求也隨之提高。而雙頻接收機(jī)由于捕獲搜索范圍加倍,增加了常規(guī)熱啟動時間,存在較大的信息滯后,一定程度上影響了雙頻接收機(jī)的性能。因此,為了在減少北斗接收機(jī)熱啟動時間的同時保證較高的初始定位精度,本文主要對北斗雙頻接收機(jī)的快速熱啟動策略進(jìn)行研究。本文針對北斗雙頻接收機(jī)的熱啟動過程,實現(xiàn)了兩點策略改進(jìn)。針對現(xiàn)有預(yù)測衛(wèi)星信號發(fā)射時間的快速熱啟動方法中衛(wèi)星位置估計值存在較大誤差的問題,給出了一種改進(jìn)方法,將較為精確的傳輸時間估值帶入衛(wèi)星位置計算,并考慮電離層誤差,以減少因衛(wèi)星位置估計誤差導(dǎo)致的接收機(jī)定位誤差。同時實現(xiàn)了熱啟動中使用北斗B1頻點輔助B2頻點的捕獲方法,利用同一顆衛(wèi)星兩頻點信號多普勒頻偏的關(guān)系,通過改變捕獲通道的分配方式,進(jìn)一步減少首次定位時間(Time to First Fix,TTFF)。針對熱啟動中捕獲北斗信號D1導(dǎo)航電文時大量存在的比特跳變問題,提出了一種基于本地碼拓展的快速捕獲方法。首先針對比特跳變問題對信號捕獲結(jié)果的影響進(jìn)行分析,指出對于常用的多次捕獲方法,比特跳變發(fā)生在積分區(qū)間中部并非最壞情況。隨后提出了一種基于本地碼拓展的快速捕獲方法,該方法通過拼接和補(bǔ)零重構(gòu)本地碼序列并設(shè)計相應(yīng)的判決器,能夠消除比特跳變引起的相關(guān)峰分裂,同時增加積分增益。通過使用蒙特卡洛仿真和實際信號捕獲測試,驗證了該方法針對比特跳變發(fā)生頻繁的北斗D1導(dǎo)航電文信號具有很好的捕獲效果。最后在基于EP2S90F1020和TMS320C6713的北斗雙頻接收機(jī)系統(tǒng)上實現(xiàn)了本文提出的策略。經(jīng)過實驗驗證,本文提出的快速熱啟動策略較常規(guī)熱啟動策略具有更短的首次定位時間,且首次定位結(jié)果精度較高,為后續(xù)的理論研究和工程實現(xiàn)奠定了良好的基礎(chǔ)。
[Abstract]:With the continuous improvement of the Beidou satellite navigation system which is independently developed in China and the publication of the spatial signal interface control file which contains the signal information of Beidou B1 and B2 civil frequency band. Beidou dual-frequency receiver is also widely used because of its high positioning accuracy. Hot start is the most commonly used receiver startup, with the development of technology. The user's request for the receiver's hot start speed and precision also increases, while the dual frequency receiver's acquisition search range is doubled, the conventional hot start time is increased, and there is a large information lag. To some extent, the performance of dual-frequency receiver is affected. Therefore, in order to reduce the hot start time of the Beidou receiver and ensure a high initial positioning accuracy. In this paper, the fast hot start strategy of Beidou dual-frequency receiver is studied, and the hot start process of Beidou dual-frequency receiver is studied in this paper. In order to solve the problem of large error in the estimation of satellite position in the current fast hot start method for predicting the launch time of satellite signal, an improved method is presented. A more accurate estimation of transmission time is introduced into the satellite position calculation, and ionospheric errors are taken into account. In order to reduce the receiver positioning error caused by the satellite position estimation error, the acquisition method using Beidou B1 frequency point to assist B2 frequency point in hot start is realized. Using the relationship of Doppler frequency offset of two frequency points of the same satellite, the first time to First Fix is further reduced by changing the allocation of the acquisition channel. TTFFN. In order to solve the problem of bit hopping in hot start to capture the Beidou signal D1 navigation message. In this paper, a fast acquisition method based on local code extension is proposed. Firstly, the influence of bit jump problem on signal acquisition results is analyzed, and the commonly used multiple acquisition methods are pointed out. Bit hopping occurs in the middle of the integral interval is not the worst case. Then a fast acquisition method based on local code extension is proposed. This method reconstructs the sequence of local codes by splicing and adding zeros and designs the corresponding decider. It can eliminate the correlation peak splitting caused by bit jump and increase the integral gain by using Monte Carlo simulation and real signal capture test. It is verified that this method has a good capture effect for the Beidou D1 navigation message signal which occurs frequently in bit hopping. Finally, the Beidou dual frequency based on EP2S90F1020 and TMS320C6713 is used. The proposed strategy is implemented on the receiver system. The fast hot start strategy proposed in this paper has shorter initial positioning time and higher accuracy than the conventional hot start strategy, which lays a good foundation for subsequent theoretical research and engineering implementation.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN965.5

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 高光輝;石玉;趙寶林;;GPS與北斗二代雙頻接收機(jī)低噪放模塊設(shè)計實現(xiàn)[J];電子科技;2013年12期

相關(guān)會議論文 前1條

1 謝松;伍蔡倫;張建偉;;基于MAX2769的GPS雙頻接收機(jī)實現(xiàn)[A];第五屆中國衛(wèi)星導(dǎo)航學(xué)術(shù)年會論文集-S7 北斗/GNSS用戶終端技術(shù)[C];2014年

相關(guān)碩士學(xué)位論文 前3條

1 王力;北斗雙頻接收機(jī)快速熱啟動策略研究[D];北京理工大學(xué);2016年

2 丁仁天;GPS雙頻接收機(jī)捕獲技術(shù)研究[D];浙江大學(xué);2013年

3 張薈;基于GPS雙頻接收機(jī)的電離層研究[D];大連海事大學(xué);2010年

，

本文編號：1465661