發(fā)布時間：2018-09-14 20:18

【摘要】：衛(wèi)星導(dǎo)航信號模擬器能夠根據(jù)載體的運動狀況精確模擬出載體收到的導(dǎo)航信號。衛(wèi)星信號模擬器可以對接收機的捕獲、跟蹤和測量精度進行測試，高動態(tài)接收機的測試更加依賴于模擬器。本文針對GPS導(dǎo)航信號模擬器在半實物閉環(huán)仿真系統(tǒng)中的應(yīng)用，對系統(tǒng)平臺總體架構(gòu)、數(shù)學(xué)模型、信號模擬方法等多方面展開了深入細致的研究。 首先根據(jù)各衛(wèi)星導(dǎo)航系統(tǒng)和導(dǎo)航信號體制的發(fā)展情況，總結(jié)了當(dāng)前衛(wèi)星導(dǎo)航信號模擬器國內(nèi)外發(fā)展現(xiàn)狀和趨勢。根據(jù)GPS導(dǎo)航信號模擬器系統(tǒng)的衛(wèi)星信號的結(jié)構(gòu)、特性和信號模型，介紹了本模擬器的架構(gòu)組成，詳細說明了軟硬件部分的功能構(gòu)成、工作原理和實現(xiàn)方案。 而后分析了信號模擬器中的狀態(tài)參數(shù)計算方法，著重研究了載體的姿態(tài)仿真技術(shù)，建立了載體姿態(tài)模型，給出載體姿態(tài)下衛(wèi)星的可見性判斷算法并進行了數(shù)學(xué)仿真，定性驗證了算法的可行性，給出了天線方向圖的模擬技術(shù)方案。 然后研究了多普勒頻率合成方法，根據(jù)載波和碼NCO的實現(xiàn)原理，介紹了多階DDS模型，，給出了時變頻率控制字的計算表達式并在多場景下進行了仿真，表明了其在高動態(tài)條件下的良好性能。 最后完成模擬器的硬件實現(xiàn)，實現(xiàn)了PCI接口和光纖模塊的同步設(shè)計，并進行了導(dǎo)航信號質(zhì)量和性能測試，驗證了模擬器的實時閉環(huán)仿真能力。
[Abstract]:The satellite navigation signal simulator can accurately simulate the navigation signal received by the carrier according to the moving state of the carrier. The acquisition, tracking and measurement accuracy of the receiver can be tested by the satellite signal simulator, and the test of the high dynamic receiver is more dependent on the simulator. In this paper, aiming at the application of GPS navigation signal simulator in the loop simulation system, the overall architecture, mathematical model and signal simulation method of the system platform are studied in detail. Firstly, according to the development of satellite navigation system and navigation signal system, the current status and trend of satellite navigation signal simulator at home and abroad are summarized. According to the structure, characteristics and signal model of the GPS navigation signal simulator system, this paper introduces the architecture of the simulator, and explains the function composition, working principle and implementation scheme of the software and hardware parts in detail. Then, the calculation method of state parameters in signal simulator is analyzed, the attitude simulation technology of carrier is studied emphatically, the attitude model of carrier is established, the visibility judgment algorithm of satellite under carrier attitude is given, and the mathematical simulation is carried out. The feasibility of the algorithm is verified qualitatively, and the simulation scheme of antenna pattern is given. Then, the Doppler frequency synthesis method is studied. According to the realization principle of carrier and code NCO, the multi-order DDS model is introduced, and the expression of time-varying frequency control word is given and simulated in multi-scene. It is shown that it has good performance under high dynamic conditions. Finally, the hardware implementation of the simulator is completed, the synchronous design of PCI interface and fiber module is realized, and the quality and performance of navigation signal are tested, which verifies the real-time closed-loop simulation capability of the simulator.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN96.1

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