【摘要】：隨著衛(wèi)星導航技術(shù)不斷地發(fā)展,特別是GPS現(xiàn)代化信號的不斷提出和改進,雙頻接收機越來越成為研究的重點和熱點。雙頻接收機能夠消除電離層干擾,提高定位精度和有效對抗多徑效應(yīng)。本文將對雙頻捕獲中的一些關(guān)鍵問題進行分析和研究。 本文針對雙頻接收機的信號模型,分析了雙頻捕獲的捕獲關(guān)鍵技術(shù),針對雙頻捕獲中遇到的比特翻轉(zhuǎn)問題,提出了一種BTC算法有效克服比特翻轉(zhuǎn)問題的方法。針對在FPGA系統(tǒng)上雙頻捕獲的資源消耗大,提出了一種優(yōu)化的相關(guān)器實現(xiàn)結(jié)構(gòu)。本文的主題章節(jié)包括以下幾個方面： (1)從GPS雙頻信號以及PRN碼的相關(guān)特性出發(fā),介紹了GPS雙頻接收機模型,分析了基帶信號處理器的核心模塊相關(guān)器的輸出特性。 (2)針對雙頻信號的特點,給出了GPS雙頻接收機的捕獲系統(tǒng)處理流程,介紹了兩種L2C碼的捕獲算法,分析了兩種提升檢測信噪比的方法。最后通過公式推導和仿真提出了各種制約因素。 (3)針對長時間相干積分中的比特翻轉(zhuǎn)問題,我們提出了一種BTC方法。針對L2C捕獲在硬件資源上的消耗過高以及BTC方法,我們提出了一種優(yōu)化的相關(guān)器結(jié)構(gòu),使得加法器最多能夠節(jié)省91%。 (4)針對捕獲的提升信噪比技術(shù)和BTC方法的性能,我們分析了檢測和判決技術(shù),并且詳細分析了非相干積分,相干積分和BTC方法的檢測性能。 (5)描述了基于FPGA的全數(shù)字GPS雙頻接收機的實現(xiàn)方案,給出了工程中捕獲系統(tǒng)的性能測試和實際測試結(jié)果。
[Abstract]:With the continuous development of satellite navigation technology, especially the development and improvement of modern GPS signal, dual-frequency receiver has become the focus and focus of research. Dual-frequency receiver can eliminate ionospheric interference, improve positioning accuracy and effectively combat multipath effect. In this paper, some key problems in dual-frequency acquisition are analyzed and studied. In this paper, according to the signal model of dual-frequency receiver, the acquisition key technology of dual-frequency acquisition is analyzed. Aiming at the bit-flipping problem encountered in dual-frequency acquisition, a BTC algorithm is proposed to overcome the bit-flipping problem effectively. In view of the high resource consumption of dual-frequency acquisition in FPGA system, an optimized correlator architecture is proposed. The main topics of this paper include the following aspects: (1) based on the correlation characteristics of GPS dual-frequency signal and PN code, the GPS dual-frequency receiver model is introduced, and the output characteristics of the correlator of the core module of baseband signal processor are analyzed. (2) according to the characteristics of dual-frequency signal, the process flow of acquisition system of GPS dual-frequency receiver is given, two acquisition algorithms of L2C code are introduced, and two methods to improve the detection signal-to-noise ratio are analyzed. Finally, various restriction factors are put forward through formula derivation and simulation. (3) for the problem of bit flipping in long-time coherent integrals, we propose a BTC method. In view of the high consumption of L2C capture on hardware resources and the BTC method, we propose an optimized correlator structure, which can save up to 91% of the adder. (4) in view of the performance of the captured lifting signal-to-noise ratio (SNR) technique and the BTC method, we analyze the detection and decision techniques, and analyze the detection performance of the incoherent integration, coherent integration and BTC methods in detail. (5) the realization scheme of all-digital GPS dual-frequency receiver based on FPGA is described, and the performance test and practical test results of the acquisition system in engineering are given.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4

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本文編號：2448271