【摘要】：軟件GNSS（Global Navigation Satellite System）數(shù)字中頻信號(hào)模擬器用于模擬產(chǎn)生多星座多信號(hào)體制的衛(wèi)星導(dǎo)航信號(hào)，為衛(wèi)星導(dǎo)航系統(tǒng)的仿真和接收機(jī)的測試提供一種高效的工具，對我國建立和發(fā)展自主的衛(wèi)星導(dǎo)航系統(tǒng)有非常重要的現(xiàn)實(shí)意義。 本文對軟件GNSS數(shù)字中頻信號(hào)模擬器的部分的關(guān)鍵技術(shù)進(jìn)行了深入研究，采取模型算法研究和系統(tǒng)具體實(shí)現(xiàn)相結(jié)合的方法。 首先，在衛(wèi)星定位的原理基礎(chǔ)上、建立了系統(tǒng)的信號(hào)模型和確定了GNSS中頻信號(hào)產(chǎn)生系統(tǒng)實(shí)現(xiàn)方案。本論文以給出的實(shí)現(xiàn)方案為主線對GNSS中頻信號(hào)源的設(shè)計(jì)逐步展開。 其次，詳細(xì)介紹了軟件GNSS中頻信號(hào)源的具體實(shí)現(xiàn)方法，包括交互界面的設(shè)計(jì)、生成導(dǎo)航電文、從導(dǎo)航電文中讀取衛(wèi)星參數(shù)，對衛(wèi)星的可見性進(jìn)行判斷。 再次，，重點(diǎn)分析了系統(tǒng)的誤差模型并將這些誤差引起的偽距誤差加入系統(tǒng)的基帶信號(hào)中使信號(hào)源的信號(hào)更能真實(shí)地模擬現(xiàn)實(shí)世界的場景。 最后，對基帶信號(hào)實(shí)現(xiàn)擴(kuò)頻調(diào)制、載波調(diào)制、合路輸出數(shù)字中頻信號(hào)，并對產(chǎn)生的中頻信號(hào)通過與軟件接收機(jī)閉環(huán)測試的方法驗(yàn)證準(zhǔn)確性并分析結(jié)果。
[Abstract]:The software GNSS (Global Navigation Satellite System) digital if signal simulator is used to simulate and generate multi-constellation and multi-signal satellite navigation signal, which provides an efficient tool for the simulation of satellite navigation system and the testing of receiver. It is very important to establish and develop autonomous satellite navigation system in China. In this paper, the key technologies of the software GNSS digital if signal simulator are deeply studied, and the method of combining the model algorithm with the system implementation is adopted. Firstly, based on the principle of satellite positioning, the signal model of the system and the realization scheme of GNSS if signal generation system are established. In this paper, the design of GNSS intermediate frequency signal source is developed step by taking the given implementation scheme as the main line. Secondly, the realization method of software GNSS intermediate frequency signal source is introduced in detail, including the design of interactive interface, the generation of navigation message, the reading of satellite parameters from the navigation message, and the judgment of satellite visibility. Thirdly, the error model of the system is analyzed and the pseudo-range error caused by these errors is added to the baseband signal of the system so that the signal of the signal source can simulate the scene of the real world more truthfully. Finally, spread spectrum modulation, carrier modulation and digital intermediate frequency signal are output for baseband signal. The accuracy of the generated if signal is verified by closed loop test with software receiver and the results are analyzed.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P228.4

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本文編號(hào)：2173901