【摘要】：衛(wèi)星導(dǎo)航信號模擬器用于在實驗室等室內(nèi)環(huán)境中模擬產(chǎn)生各種實際環(huán)境下的衛(wèi)星導(dǎo)航信號。它可以根據(jù)接收機動態(tài)特性，對各種干擾與誤差進行模擬控制與修正，生成實際接收到的衛(wèi)星導(dǎo)航信號，從而測試接收機的相關(guān)性能。為了滿足衛(wèi)星導(dǎo)航信號的調(diào)制方式、多路復(fù)用方式以及擴頻碼試驗驗證需求，對測距精度、抗干擾、抗多徑、兼容性等方面性能進行驗證、評估與優(yōu)化，一個能夠定量評估、可重復(fù)、具有足夠精度、可以模擬多種應(yīng)用環(huán)境的衛(wèi)星導(dǎo)航信號模擬器是必不可少的。 本文即以GPS L1信號為例，著重介紹一種采用LabVIEW與MATLAB混合編程，控制虛擬儀器來模擬產(chǎn)生衛(wèi)星導(dǎo)航信號的思想與具體的實現(xiàn)方法。首先簡單描述了GPS導(dǎo)航信號的特性，確定以C/A碼作為本文的研究對象；然后基于MATLAB編程，研究L1基帶信號的生成方法；隨后重點討論了基于LabVIEW對基帶信號進行處理的方式與途徑以及控制硬件設(shè)備模擬產(chǎn)生射頻信號的方法；最后通過LabVIEW配合相關(guān)的虛擬儀器設(shè)備搭建了一個信號采集平臺，通過頻譜儀與信號采集平臺對產(chǎn)生的信號進行了分析與驗證。 本文將“虛擬儀器”技術(shù)引入到衛(wèi)星導(dǎo)航信號模擬器的設(shè)計當中，具有實現(xiàn)簡單，，可控性、兼容性與擴展性更好的特點，可以在通用平臺基礎(chǔ)上快速實現(xiàn)專用模擬器的功能，從而縮短開發(fā)周期，滿足多體制導(dǎo)航信號驗證的需求。
[Abstract]:Satellite navigation signal simulator is used to simulate and generate satellite navigation signals in laboratory and other indoor environments. According to the dynamic characteristics of the receiver, it can simulate and control all kinds of interference and error, and generate the satellite navigation signal which is actually received, so as to test the performance of the receiver. In order to meet the requirements of modulation, multiplexing and spread spectrum code test of satellite navigation signal, the performance of ranging accuracy, anti-jamming, anti-multipath, compatibility and so on is verified, evaluated and optimized. It is necessary to simulate the satellite navigation signal simulator with repeatability and enough precision. In this paper, taking GPS L1 signal as an example, this paper introduces an idea and implementation method of using LabVIEW and MATLAB mixed programming to control virtual instrument to simulate the generation of satellite navigation signal. Firstly, the characteristics of GPS navigation signal are briefly described, and the C / A code is chosen as the research object of this paper, then based on MATLAB programming, the generation method of L1 baseband signal is studied. Then, the way of processing baseband signal based on LabVIEW and the method of controlling the simulation of hardware device to generate RF signal are discussed emphatically. Finally, a signal acquisition platform is built through LabVIEW with related virtual instrument equipment. The generated signals are analyzed and verified by spectrometer and signal acquisition platform. This paper introduces "virtual instrument" technology into the design of satellite navigation signal simulator. It has the characteristics of simple realization, controllability, better compatibility and expansibility, and can quickly realize the function of special simulator on the basis of general platform. In order to shorten the development cycle and meet the needs of multi-system navigation signal verification.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4

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