서지주요정보
광섬유 자이로스코프를 위한 새로운 디지털 신호처리방법 = A new digital signal processing method for fiber optical gyroscope
서명 / 저자 광섬유 자이로스코프를 위한 새로운 디지털 신호처리방법 = A new digital signal processing method for fiber optical gyroscope / 오형석.
저자명 오형석 ; Oh, Hyoung-Seok
발행사항 [대전 : 한국과학기술원, 2002].
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소장정보

등록번호

8013039

소장위치/청구기호

학술문화관(문화관) 보존서고

MEE 02062

휴대폰 전송

도서상태

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리뷰정보

초록정보

This dissertation describes a new digital signal processing method for the closed-loop fiber optical gyroscope. A fiber optical gyroscope is an interferometric instrument, which measures the rotation rate utilizing the Sagnac effect. The output signal is cosinusoidal form of phase difference. Thus, it has the properties of 2π ambiguity, a narrow dynamic range, and low sensitivity. To solve the problems, the closed loop signal processing is generally used. In the closed loop approach, the detector output of gyroscope is used as error signal for the feedback loop. The feedback phase shift compensates for the Sagnac phase shift induced by the rotation. In proposed method, it merges the bias and feedback phase modulation signals in one phase modulation signal and its frequency is $1/τ_4$. It has 4 states ($τ_1$, $τ_2$, $τ_3$, $τ_4$) in one period (4τ). And its values in the first ($τ_1$) and the third ($τ_3$) are varied with rotation rate. Every period, 4τ, the rotation rate is calculated. And the phase difference between Sagnac and feedback phase shift is updated for compensation. As a result, the sensing speed in this method is faster than that in the conventional serrodyne method. The value of the modulated output signal is converted directly into digital data at each one-fourth period ($τ_1$, $τ_2$, $τ_3$, $τ_4$). Then, the value of the third ($τ_3$) is subtracted digitally from that of the first ($τ_1$). Such digital demodulation is intrinsically free of any source of electronic long-term drift, such as the input offset in the AD converter. And we have used a digital integrator to reduce noises, such as thermal noise, shot noise, and so on. The use of a digital integrator yields the same noise reduction as low-pass analog filtering.

서지기타정보

서지기타정보
청구기호 {MEE 02062
형태사항 ii, 49 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyoung-Seok Oh
지도교수의 한글표기 : 김충기
지도교수의 영문표기 : Choong-Ki Kim
학위논문 학위논문(석사) - 한국과학기술원 : 전기및전자공학전공,
서지주기 참고문헌 수록
주제 광섬유자이로스코프
gyroscope
serrodyne
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