【摘要】：Sagnac光纖干涉儀是一種典型的雙光束光纖干涉儀,主要應(yīng)用領(lǐng)域是干涉式光纖陀螺儀,其利用Sagnac效應(yīng)來(lái)測(cè)量物體相對(duì)于慣性空間的旋轉(zhuǎn)角速度。本學(xué)位論文主要對(duì)開環(huán)結(jié)構(gòu)光纖陀螺儀的數(shù)字信號(hào)處理方法進(jìn)行了研究。光纖陀螺儀的硬件包括光路和信號(hào)處理電路兩個(gè)部分。論文描述了典型的開環(huán)光纖陀螺光路系統(tǒng)的組成,對(duì)主要光學(xué)器件的性能做了分析,并介紹了信號(hào)處理電路的詳細(xì)設(shè)計(jì)過程,包括主要元器件的選型及工作原理。目前在開環(huán)陀螺的信號(hào)處理領(lǐng)域已經(jīng)有多種解調(diào)方案被提出,論文對(duì)幾種開環(huán)解調(diào)方案的實(shí)現(xiàn)過程做了總結(jié)。論文的核心是基于多次諧波的數(shù)字式開環(huán)光纖陀螺信號(hào)處理方案的設(shè)計(jì),數(shù)字信號(hào)處理采用FPGA實(shí)現(xiàn)。由于光纖陀螺的光電探測(cè)器輸出信號(hào)很微弱,因此在解調(diào)過程中采用鎖定放大技術(shù)來(lái)進(jìn)行微弱信號(hào)檢測(cè)。論文的一個(gè)創(chuàng)新之處在于使用占用邏輯資源較少的CORDIC算法完成了信號(hào)處理中的調(diào)制正弦波產(chǎn)生、鎖定放大器相敏檢測(cè)和Sagnac相移解調(diào)等重要步驟。此外,調(diào)制深度控制和關(guān)鍵相位點(diǎn)的解調(diào)等工程應(yīng)用中的實(shí)際問題也在論文中進(jìn)行了詳細(xì)討論。由于數(shù)字信號(hào)處理過程中存在各種誤差,論文對(duì)主要的幾種誤差來(lái)源進(jìn)行了分析,重點(diǎn)討論了相位調(diào)制器的非線性對(duì)陀螺零偏的影響。論文的另一個(gè)創(chuàng)新之處是提出了一種基于數(shù)字相位跟蹤算法的新型開環(huán)光纖陀螺解調(diào)方案。實(shí)驗(yàn)結(jié)果如下：在常溫條件下,開環(huán)光纖陀螺在-±200°/s的轉(zhuǎn)速范圍內(nèi)的標(biāo)度因數(shù)非線性度為818ppm,零偏為-10.60°/h,零偏不穩(wěn)定性為0.046°/h,隨機(jī)游走系數(shù)為0.008°/(?)。
[Abstract]:Sagnac fiber optic interferometer is a typical two-beam fiber optic interferometer. The main application field is interferometric fiber optic gyroscope, which uses Sagnac effect to measure the rotational angular velocity of objects relative to inertial space. In this thesis, the digital signal processing method of open-loop fiber optic gyroscope is studied. The hardware of fiber optic gyroscope consists of optical circuit and signal processing circuit. This paper describes the composition of the typical open-loop fiber optic gyroscope optical circuit system, analyzes the performance of the main optical devices, and introduces the detailed design process of the signal processing circuit, including the selection of the main components and the working principle. At present, many demodulation schemes have been proposed in the field of open loop gyro signal processing. The implementation of several open loop demodulation schemes is summarized in this paper. The core of this paper is the design of digital open-loop fiber optic gyroscope signal processing scheme based on multiple harmonics. The digital signal processing is realized by FPGA. Because the output signal of fiber optic gyroscope photodetector is very weak, lock-in amplification technique is used to detect weak signal in the demodulation process. One of the innovations of this paper is that the modulation sine wave generation in signal processing, the phase sensitivity detection of locking amplifier and the demodulation of Sagnac phase shift are accomplished by using CORDIC algorithm, which takes less logical resources. In addition, the practical problems in engineering applications, such as modulation depth control and demodulation of key phase points, are also discussed in detail in this paper. Because there are various kinds of errors in digital signal processing, the main error sources are analyzed in this paper, and the influence of nonlinearity of phase modulator on gyro bias is mainly discussed. Another innovation of this paper is to propose a new open-loop fiber optic gyroscope demodulation scheme based on digital phase tracking algorithm. The experimental results are as follows: at room temperature, the scale factor nonlinearity is 818ppm, the zero deviation is-10.60o / h and the zero bias instability is 0.046 擄/ h in the rotation speed range of-鹵200 擄/ s for open-loop fiber optic gyroscopes. The random walk coefficient is 0.008 擄/ (?).
【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】：2016
【分類號(hào)】：TH744.3;TN911.72

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 覃喜慶,曾祥鴻,董靜,李平;基于ADN8830的高性能TEC控制電路[J];光學(xué)與光電技術(shù);2004年01期

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