本文關(guān)鍵詞： 加速度計(jì) 全數(shù)字閉環(huán) PID控制 二元調(diào)寬脈沖　出處：《長沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：石英撓性加速度計(jì)是慣性導(dǎo)航系統(tǒng)組成的關(guān)鍵器件之一,其應(yīng)用范圍涉及航空、航天、航海以及一些民用領(lǐng)域。加速度計(jì)的讀出精度決定了慣性導(dǎo)航系統(tǒng)的導(dǎo)航精度,傳統(tǒng)的加速度計(jì)讀出電路通過模擬電路實(shí)現(xiàn),模擬電路結(jié)構(gòu)復(fù)雜、抗干擾性低缺特點(diǎn)制約了加速度計(jì)讀出電路的精度和穩(wěn)定性。隨著數(shù)字化處理的飛速發(fā)展,數(shù)字電路逐步具有高穩(wěn)定性以及高抗干擾性等特性,加速度計(jì)的數(shù)字化讀出成了研究熱點(diǎn),本課題對加速度計(jì)的全數(shù)字化讀出方式進(jìn)行了研究。通過對傳統(tǒng)的模擬讀出電路方案和模數(shù)結(jié)合讀出方案的對比與分析,確定了基于FPGA的全數(shù)字加速度計(jì)讀出方案,整個(gè)全數(shù)字讀出電路包含三個(gè)模塊電路：差動電容檢測電路、數(shù)字控制電路和力矩器控制電路。采用多方案對比設(shè)計(jì),從分辨率、讀出精度等角度對比分析了兩種差動電容數(shù)字檢測電路,選用了頻率法檢測電路實(shí)現(xiàn)電容差的檢測；采用了數(shù)字PID控制算法,實(shí)現(xiàn)了加速度計(jì)讀出電路的閉環(huán)自動控制：從加矩功率、分辨率、零偏穩(wěn)定性、刻度因素及線性度和動態(tài)響應(yīng)等方面對多種PWM數(shù)字脈沖力矩器加矩方式進(jìn)行了對比與分析,確定了二元調(diào)寬脈沖的加矩方式實(shí)現(xiàn)對加速度計(jì)的加矩；設(shè)計(jì)了FPGA下位機(jī)與計(jì)算機(jī)上位機(jī)連接,通過基于VB的可視界面實(shí)現(xiàn)了加速度計(jì)數(shù)據(jù)讀出的顯示、存儲以及部分控制,用于對讀出電路的測試。對整個(gè)加速度計(jì)讀出電路進(jìn)行了階躍、動態(tài)、靜態(tài)等測試,驗(yàn)證了石英撓性加速度計(jì)的全數(shù)字閉環(huán)讀出電路的成功實(shí)現(xiàn),可以測得讀出電路的讀出標(biāo)準(zhǔn)偏差為1.5×10-5g,精度為10-4g的加速度值。
[Abstract]:Quartz flexible accelerometer is one of the key components of inertial navigation system. Its application scope involves aviation, aerospace, navigation and some civil fields. The readout accuracy of accelerometer determines the navigation accuracy of inertial navigation system. The traditional accelerometer readout circuit is realized by analog circuit. The structure of analog circuit is complex and the characteristic of low anti-interference restricts the precision and stability of accelerometer readout circuit. Digital circuits gradually have the characteristics of high stability and high anti-interference. The digital readout of accelerometers has become a research hotspot. The whole digital readout method of accelerometer is studied in this paper. By comparing and analyzing the traditional analog readout circuit scheme and the analog-to-digital readout scheme, the full digital accelerometer readout scheme based on FPGA is determined. The whole digital readout circuit consists of three modules: differential capacitance detection circuit, digital control circuit and torque control circuit. In this paper, two kinds of differential capacitance digital detection circuits are compared and analyzed from the angle of readout precision, frequency method is used to detect capacitance difference, and digital PID control algorithm is used. The closed loop automatic control of accelerometer readout circuit is realized. Several PWM digital pulse torque adding methods are compared and analyzed from the aspects of moment power, resolution, zero bias stability, calibration factor, linearity and dynamic response, etc. The method of adding moment to accelerometer is determined, and the connection between FPGA lower computer and computer is designed, and the display, storage and partial control of accelerometer data are realized by visual interface based on VB. It is used to test the readout circuit. The step, dynamic and static test of the whole accelerometer readout circuit is carried out, which verifies the successful realization of the full digital closed loop readout circuit of the quartz flexible accelerometer. The readout standard deviation of the readout circuit is 1.5 脳 10 ~ (-5) g and the precision is 10 ~ (-4) g.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN96

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 李彩萍;李樂生;;方波激勵(lì)下一階RC電路響應(yīng)的研究[J];數(shù)字技術(shù)與應(yīng)用;2011年11期

2 韓劍輝,黃西珍,谷云彪,陳桂紅,馮學(xué)泰,凌林本;加速度計(jì)自動測試系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)[J];中國慣性技術(shù)學(xué)報(bào);2002年02期

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本文編號：1506040