【摘要】：隨著衛(wèi)星導(dǎo)航技術(shù)不斷地發(fā)展,特別是GPS現(xiàn)代化信號(hào)的不斷提出和改進(jìn),雙頻接收機(jī)越來(lái)越成為研究的重點(diǎn)和熱點(diǎn)。雙頻接收機(jī)能夠消除電離層干擾,提高定位精度和有效對(duì)抗多徑效應(yīng)。本文將對(duì)雙頻捕獲中的一些關(guān)鍵問(wèn)題進(jìn)行分析和研究。 本文針對(duì)雙頻接收機(jī)的信號(hào)模型,分析了雙頻捕獲的捕獲關(guān)鍵技術(shù),針對(duì)雙頻捕獲中遇到的比特翻轉(zhuǎn)問(wèn)題,提出了一種BTC算法有效克服比特翻轉(zhuǎn)問(wèn)題的方法。針對(duì)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(shí)現(xiàn)結(jié)構(gòu)。本文的主題章節(jié)包括以下幾個(gè)方面： (1)從GPS雙頻信號(hào)以及PRN碼的相關(guān)特性出發(fā),介紹了GPS雙頻接收機(jī)模型,分析了基帶信號(hào)處理器的核心模塊相關(guān)器的輸出特性。 (2)針對(duì)雙頻信號(hào)的特點(diǎn),給出了GPS雙頻接收機(jī)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(cè)信噪比的方法。最后通過(guò)公式推導(dǎo)和仿真提出了各種制約因素。 (3)針對(duì)長(zhǎng)時(shí)間相干積分中的比特翻轉(zhuǎn)問(wèn)題,我們提出了一種BTC方法。針對(duì)L2C捕獲在硬件資源上的消耗過(guò)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(duì)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(cè)和判決技術(shù),并且詳細(xì)分析了非相干積分,相干積分和BTC方法的檢測(cè)性能。 (5)描述了基于FPGA的全數(shù)字GPS雙頻接收機(jī)的實(shí)現(xiàn)方案,給出了工程中捕獲系統(tǒng)的性能測(cè)試和實(shí)際測(cè)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(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：P228.4

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本文編號(hào)：2448271