【摘要】：全球衛(wèi)星導(dǎo)航系統(tǒng)（GNSS）是航天大國(guó)的重要標(biāo)志，是各國(guó)競(jìng)相發(fā)展的熱門(mén)領(lǐng)域。北斗衛(wèi)星導(dǎo)航系統(tǒng)（BDS）作為我國(guó)自主研發(fā)、完全獨(dú)立運(yùn)行的全球衛(wèi)星導(dǎo)航系統(tǒng)，勢(shì)必將應(yīng)用于國(guó)家建設(shè)的各個(gè)領(lǐng)域，為廣大人民群眾帶來(lái)巨大的社會(huì)和經(jīng)濟(jì)效益。因此，它具有較大的研究?jī)r(jià)值，也包括了系統(tǒng)重要組成中的接收機(jī)部分。傳統(tǒng)接收機(jī)都是基于硬件實(shí)現(xiàn)的，其優(yōu)點(diǎn)是運(yùn)算速度快，缺點(diǎn)是算法固定、不易改變硬件、靈活性差。通過(guò)結(jié)合軟件無(wú)線電技術(shù)，實(shí)現(xiàn)接收機(jī)的軟件化設(shè)計(jì)，更好地彌補(bǔ)了傳統(tǒng)硬件接收機(jī)的缺點(diǎn)。本文針對(duì)北斗二代B1頻點(diǎn)信號(hào)進(jìn)行了深入的研究，借助于Matlab仿真平臺(tái)，實(shí)現(xiàn)了北斗二代B1頻點(diǎn)軟件接收機(jī)設(shè)計(jì)研究。 首先，本文簡(jiǎn)要介紹了北斗二代B1頻點(diǎn)信號(hào)的結(jié)構(gòu)與特性。其次，說(shuō)明了軟件接收機(jī)射頻前端數(shù)字中頻數(shù)據(jù)處理和采集。然后，著重研究了B1I基帶信號(hào)處理。在信號(hào)捕獲過(guò)程中，本文采用等長(zhǎng)補(bǔ)零的方法得到本地2ms偽碼，通過(guò)與輸入信號(hào)進(jìn)行2ms相干累加積分，實(shí)現(xiàn)了B1I信號(hào)的精確捕獲。在信號(hào)跟蹤過(guò)程中，通過(guò)精細(xì)載波頻率來(lái)縮小頻率誤差容限，并采用非相干延遲鎖定環(huán)（DLL）和載波跟蹤環(huán)（PLL）相結(jié)合的方式，實(shí)現(xiàn)了B1I信號(hào)的穩(wěn)定跟蹤輸出。之后，，介紹了導(dǎo)航電文解調(diào)和定位解算的原理及相關(guān)知識(shí)。最后，采用上述方法對(duì)實(shí)際采集到的B1I信號(hào)數(shù)據(jù)在Matlab平臺(tái)上進(jìn)行軟件算法驗(yàn)證，結(jié)果表明和實(shí)際用戶坐標(biāo)對(duì)比，北斗軟件接收機(jī)解算出的用戶所在位置坐標(biāo)誤差較小，具有良好的定位精度。
[Abstract]:Global satellite navigation system (GNSS) is an important symbol of a large spaceflight and a hot area for the development of various countries. Beidou Satellite Navigation system (BDS), as a global satellite navigation system independently developed and operated independently in China, is bound to be applied in various fields of national construction and bring huge social and economic benefits to the broad masses of the people. Therefore, it has great research value, and also includes the receiver part of the important components of the system. The traditional receiver is based on hardware, which has the advantages of fast operation speed, fixed algorithm, difficult to change the hardware, and poor flexibility. By combining the software radio technology, the software design of the receiver is realized, which makes up for the shortcomings of the traditional hardware receiver. In this paper, the Beidou second generation B1 frequency point signal is deeply studied, and the design of Beidou second generation B1 frequency point software receiver is realized with the help of Matlab simulation platform. Firstly, the structure and characteristics of Beidou second generation B1 signal are briefly introduced in this paper. Secondly, the software receiver RF front end digital if data processing and acquisition are explained. Then, the B 1 I baseband signal processing is studied. In the process of signal acquisition, the local 2ms pseudo-code is obtained by equal-length complement, and the accurate acquisition of B1I signal is realized by 2ms coherent accumulation integral with the input signal. In the signal tracking process, the frequency error tolerance is reduced by fine carrier frequency, and the stable tracking output of the B1I signal is realized by combining the incoherent delay locking loop (DLL) and the carrier tracking loop (PLL). Then, the principle and knowledge of navigation message demodulation and location resolution are introduced. Finally, the software algorithm of the B1I signal data collected on the Matlab platform is verified by the above method. The results show that compared with the actual user coordinates, the coordinate error of the B1I signal calculated by the Beidou software receiver is smaller than that of the actual user coordinates. Good positioning accuracy.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN96.1

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