【摘要】：載波、偽碼的捕獲跟蹤是衡量北斗接收機性能的關(guān)鍵指標(biāo)之一。然而由于北斗系統(tǒng)比GPS等有更長的偽隨機序列，當(dāng)采用傳統(tǒng)捕獲方法時，它將耗費更長的捕獲時間和更多的資源。本文采用基于差分匹配濾波器的并行分集結(jié)構(gòu)，利用匹配濾波器將載波-偽碼的二維搜索化解為載波的一維搜索，并通過差分濾波器和并行分集的理論在并行捕獲中資源的復(fù)用進一步降低資源的消耗、縮短捕獲時間。針對北斗信號的特點，仿照GPS信號發(fā)射模型對北斗信號的產(chǎn)生進行建模。基于多普勒頻移對相關(guān)增益影響的特性，對北斗信號的捕獲算法進行了設(shè)計與仿真。對接收機在均勻頻帶干擾和窄帶干擾條件的抗干擾性能進行了評估。結(jié)果表明：本文中所采用的捕獲結(jié)構(gòu)在復(fù)雜度上低于常用的捕獲算法，硬件運算復(fù)雜度并不隨過采樣倍數(shù)的增加而增加。在干信比低于30dB的情況下，，接收機在均勻頻帶干擾和窄帶干擾的條件下能在很低的誤碼率下工作。
[Abstract]:Acquisition and tracking of carrier and pseudo code is one of the key indexes to evaluate the performance of Beidou receiver. However, Beidou system has longer pseudorandom sequences than GPS and so on. When the traditional acquisition method is adopted, it will consume longer acquisition time and more resources. In this paper, the parallel diversity structure based on differential matched filter is used to resolve the two-dimensional search of carrier and pseudo code into one dimensional search of carrier. Furthermore, the reuse of resources in parallel acquisition based on the theory of differential filter and parallel diversity can further reduce the consumption of resources and shorten the acquisition time. According to the characteristics of Beidou signal, the model of Beidou signal is modeled according to the GPS signal transmission model. Based on the influence of Doppler frequency shift on correlation gain, the acquisition algorithm of Beidou signal is designed and simulated. The anti-jamming performance of the receiver under uniform band interference and narrow band interference is evaluated. The results show that the complexity of the acquisition structure used in this paper is lower than that of the conventional acquisition algorithms, and the hardware complexity does not increase with the increase of oversampling times. When the signal ratio is lower than 30dB, the receiver can work under the condition of uniform band interference and narrow band interference at very low bit error rate (BER).
【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】：TN96.1

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