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北斗二代軟件接收機(jī)關(guān)鍵技術(shù)研究

發(fā)布時(shí)間:2018-07-26 15:27
【摘要】:北斗衛(wèi)星導(dǎo)航系統(tǒng),簡稱北斗系統(tǒng),英文縮寫為BDS。北斗系統(tǒng)是我國自行研制開發(fā)的全球衛(wèi)星定位通信系統(tǒng)。該系統(tǒng)除了可為各類用戶提供精準(zhǔn)可靠的定位,導(dǎo)航和授時(shí)服務(wù)外,它還獨(dú)有短報(bào)文通信功能。北斗二代軟件接收機(jī)具有硬件接收機(jī)無法比擬的優(yōu)點(diǎn),可以充分發(fā)揮軟件的靈活性,為促進(jìn)北斗導(dǎo)航算法研究,,加速北斗系統(tǒng)的發(fā)展奠定了基礎(chǔ)。 本文主要對北斗二代的B1頻點(diǎn)信號軟件接收機(jī)的關(guān)鍵技術(shù)進(jìn)行研究,主要內(nèi)容包括對衛(wèi)星信號的捕獲跟蹤以及后續(xù)的解碼解算處理。在捕獲跟蹤部分,首先對多種捕獲算法進(jìn)行比較分析,利用碼相位并行捕獲和精細(xì)捕獲相結(jié)合的方法實(shí)現(xiàn)了對北斗實(shí)際信號的捕獲;然后介紹了信號的跟蹤原理,對信號跟蹤參數(shù)的設(shè)置進(jìn)行了探索,選用最適當(dāng)?shù)膮?shù)對實(shí)際北斗信號進(jìn)行了跟蹤。在解碼解算部分,進(jìn)行了NH碼解調(diào)和BCH校驗(yàn),提出了兩種不同的校驗(yàn)方法,在保證導(dǎo)航電文正確性的基礎(chǔ)上,提取子幀內(nèi)容,解算星歷參數(shù),得到定位結(jié)果。通過對定位結(jié)果和實(shí)際位置的比較,其誤差在允許范圍內(nèi),驗(yàn)證了算法的可行性。
[Abstract]:Beidou Satellite Navigation system, abbreviated as BDSs, is short for Beidou system. Beidou system is a global positioning communication system developed by our country. This system not only provides accurate and reliable positioning, navigation and time service for all kinds of users, but also has the function of short message communication. Beidou second generation software receiver has the advantage that the hardware receiver can not compare, can give full play to the flexibility of the software, and has laid the foundation for promoting the research of Beidou navigation algorithm and speeding up the development of Beidou system. In this paper, the key technology of the software receiver of Beidou second generation B1-frequency signal is studied. The main contents include the acquisition and tracking of satellite signal and the subsequent decoding processing. In the part of acquisition and tracking, several acquisition algorithms are compared and analyzed, and the method of code phase parallel acquisition and fine capture is used to realize the acquisition of Beidou actual signal, and then the principle of signal tracking is introduced. The setting of signal tracking parameters is explored and the most appropriate parameters are selected to track the actual Beidou signal. In the decoding part, NH code demodulation and BCH check are carried out, and two different checking methods are proposed. On the basis of ensuring the correctness of the navigation message, the contents of sub-frames are extracted, the ephemeris parameters are solved, and the location results are obtained. By comparing the location results with the actual position, the error is within the allowable range, and the feasibility of the algorithm is verified.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN965.5

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