本文關(guān)鍵詞：光纖干涉信號(hào)的數(shù)字處理方法的研究　出處：《浙江大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 光纖陀螺 數(shù)字開(kāi)環(huán)檢測(cè) 數(shù)字閉環(huán)檢測(cè) ADSP-21992

【摘要】：光纖雙光束干涉信號(hào)的數(shù)字處理方法研究主要針對(duì)Sagnac干涉儀,即干涉式光纖陀螺(Interferometric Fiber Optic Gyro, IFOG),其常用作為高精度的慣性角速度傳感器,在導(dǎo)航和制導(dǎo)領(lǐng)域占據(jù)重要的地位。 本文第一部分主要介紹基于FPGA的開(kāi)環(huán)光纖陀螺的數(shù)字系統(tǒng)設(shè)計(jì)方法的研究。相比于傳統(tǒng)的模擬開(kāi)環(huán)檢測(cè)電路,數(shù)字開(kāi)環(huán)檢測(cè)系統(tǒng)具有更好的穩(wěn)定性、高集成度的體積以及較強(qiáng)的抗干擾能力等優(yōu)點(diǎn)。針對(duì)大多數(shù)DSP開(kāi)環(huán)檢測(cè)方案,本文提出了一種基于CORDIC算法及微弱信號(hào)檢測(cè)原理,以FPGA為數(shù)字核心運(yùn)算單元,實(shí)現(xiàn)調(diào)制正弦波的產(chǎn)生以及各次諧波信號(hào)的解調(diào)。最終實(shí)現(xiàn)干涉信號(hào)的一次諧波、二次諧波以及四次諧波的解調(diào)輸出。 本文第二部分重點(diǎn)對(duì)數(shù)字閉環(huán)光纖陀螺干涉信號(hào)的數(shù)字檢測(cè)系統(tǒng)作了研究。首先介紹陀螺的系統(tǒng)結(jié)構(gòu),以及其相關(guān)誤差機(jī)理分析。閉環(huán)數(shù)字檢測(cè)系統(tǒng)采用傳統(tǒng)的方波調(diào)制解調(diào)以及階梯波反饋方案。介于已有的A/D轉(zhuǎn)換器+FPGA以及A/D+CPLD+DSP為核心的檢測(cè)方案,本設(shè)計(jì)將采用ADI公司高度集成化的ADSP-21992芯片做高速采樣及信號(hào)處理。將干涉產(chǎn)生的Sagnac旋轉(zhuǎn)相移φs通過(guò)ADSP芯片的A/D轉(zhuǎn)換器控制端高速采樣送入DSP數(shù)字處理模塊,得到相位的誤差信息并通過(guò)積分反饋控制形成階梯波反饋相位φf(shuō),抵消其產(chǎn)生的Sagnac相移。將方波調(diào)制信號(hào)疊加至反饋階梯波一起通過(guò)反饋通道施加到相位調(diào)制器(LiNbO3)上,從而實(shí)現(xiàn)第一閉環(huán)反饋。同時(shí),為了修正2π電壓隨溫度漂移引起的誤差,通過(guò)第二閉環(huán)反饋控制來(lái)調(diào)節(jié)LiNbO3的2π復(fù)位電壓。最終通過(guò)ADSP的同步串行口SPORT實(shí)現(xiàn)與上位機(jī)的數(shù)據(jù)傳輸。該系統(tǒng)的實(shí)驗(yàn)結(jié)果主要包括零偏為-7.29°/h(包含當(dāng)?shù)刈赞D(zhuǎn)-7.56°/h),零偏穩(wěn)定性約為0.012°/h,隨機(jī)游走系數(shù)為0.0045°/(?)h,標(biāo)度因素非線性度為3.88ppm。
[Abstract]:The digital processing method of optical fiber dual-beam interference signal is mainly focused on the Sagnac interferometer. The Interferometric Fiber Optic Gyro (IFOG) is commonly used as an inertial angular velocity sensor with high precision. It plays an important role in the field of navigation and guidance. The first part of this paper mainly introduces the design method of digital system of open-loop fiber optic gyroscope based on FPGA. Compared with the traditional analog open-loop detection circuit, the digital open-loop detection system has better stability. For most DSP open-loop detection schemes, this paper proposes a new method based on CORDIC algorithm and weak signal detection principle. Using FPGA as the digital core operation unit, the generation of modulated sine wave and demodulation of each harmonic signal are realized, and the demodulation output of the first harmonic, the second harmonic and the fourth harmonic of the interference signal is finally realized. The second part of this paper focuses on the digital detection system of the digital closed loop fiber optic gyro interference signal. Firstly, the structure of the gyro system is introduced. The closed-loop digital detection system adopts the traditional square wave modulation and demodulation and step wave feedback scheme. It is between the existing A / D converter FPGA and the A / D CPLD. DSP is the core detection scheme. In this design, the highly integrated ADSP-21992 chip of ADI company will be used for high speed sampling and signal processing. The Sagnac rotation phase shift 蠁 s produced by interference will be passed through the A / D of ADSP chip. High speed sampling at the control end of the converter is fed into the DSP digital processing module. The error information of the phase is obtained and the step wave feedback phase 蠁 f is formed by integral feedback control. The square wave modulation signal is superimposed on the feedback ladder wave to be applied to the phase modulator Linbo _ 3 through the feedback channel, thus realizing the first closed-loop feedback. At the same time. In order to correct the error caused by the temperature drift of 2 蟺 voltage. The 2 蟺 reset voltage of LiNbO3 is adjusted by the second closed-loop feedback control. Finally, the data transmission to the host computer is realized through the synchronous serial port SPORT of ADSP. The experimental results of the system mainly include. The bias is -7.29 擄/ h (. Including local rotation-7.56 擄/ h). The zero bias stability is about 0.012 擄/ h, and the random walk coefficient is 0.0045 擄/ r? The nonlinearity of the scale factor is 3.88 ppm.
【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】：2014
【分類(lèi)號(hào)】：TN911.7

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