• 제목, 요약, 키워드: magnetometer

검색결과 472건 처리시간 0.051초

DESIGN OF A LOW-COST 2-AXES FLUXGATE MAGNETOMETER FOR SMALL SATELLITE APPLICATIONS

  • Kim, Su-Jeoung;Moon, Byoung-Young;Chang, Young-Keun;Oh, Hwa-Suk
    • Journal of Astronomy and Space Sciences
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    • v.22 no.1
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    • pp.35-46
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    • 2005
  • This paper addresses the design and analysis results of a 2-axes magnetometer for attitude determination of small satellite. A low-cost and efficient 2-axes fluxgate magnetometer was selected as the most suitable attitude sensor for LEO microsatellites which require a low-to-medium level pointing accuracy. An optimization trade-off study has been performed for the development of 2-axes fluxgate magnetometer. All the relevant parameters such as permeability, demagnetization factor, coil diameter, core thickness, and number of coil turns were considered for the sizing of a small satellite magnetometer. The magnetometer which is designed, manufactured, and tested in-house as described in this paper satisfies linearity requirement for determining attitude position of small satellites. On the basis of magnetometer which is designed in Space System Research Lab. (SSRL), commercial magnetometer will be developed.

Vehicle Heading Angle Determination Using Magnetometer

  • Lee, Seon-Ho;Ahn, Hyo-Sung
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1259-1261
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    • 2003
  • The vehicle's heading angle determination is formulated and the proposed method based on geometry engages the magnetometer and the GPS. The resulting maximum determination accuracy of 0.3deg over the entire earth as a standard deviation is obtained for a magnetometer with measurement error of 1nT.

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함정 자기신호 측정용 3-축 디지털 자기센서 설계 및 제작에 관한 연구 (Design and Fabrication of Digital 3-axis Magnetometer for Magnetic Signal from Warship)

  • 김은애;손대락
    • 한국자기학회지
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    • v.24 no.4
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    • pp.123-127
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    • 2014
  • 본 연구에서는 함정을 자기소거시키는 과정에서 함정에 의한 자기장을 측정하기위한 3-축의 flux-gate 마그네토미터를 설계 제작하였다. 설계에서 고려한 사항은 자기장측정지점과 자기장 데이터를 수집하는 장치 사이의 거리가 수백미터로 멀기 때문에 입력전압의 변동이 커도 동작이 되게 전압 범위가 16~36 V까지 가능한 DC/DC 변환기를 사용하였고, 데이터의 전송은 자기장 측정값을 디지털로 변환 시킨 후 RS422통신으로 전송하게 하였다. 또한 함정을 자기소거 하는 과정에서 발생하는 ${\pm}1mT$ 자기장하에서도 0점의 변화가 ${\pm}2nT$ 이하가 되게 피측정자기장의 보상은 ${\pm}1mT$, 측정범위는 ${\pm}0.1mT$가 되게 제작을 하였다. 또한 수심 30 m에서도 동작되어야하는 조건을 고려하여 6기압 하에서 센서가 수밀이 되고 정상 작동이 되는 것을 확인 하였다. 마그네토미터의 일반특성으로는 선형도가 측정범위 ${\pm}0.1mT$에서 0.01 % 이상 이였고 센서의 노이즈는 1 Hz에서 $30pT/\sqrt{Hz}$이였다.

자장계를 이용한 인공위성의 자세결정 알고리즘 (Spacecraft Attitude Determination Algorithm Using Magnetometer)

  • 민현주;김인중;김진호;박춘배;용기력;이승우
    • 제어로봇시스템학회:학술대회논문집
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    • pp.342-342
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    • 2000
  • We present 3-axis stabilized spacecraft attitude determination algorithm using the magnetometer. The magnetometer has been used as a reliable, light-weight and inexpensive sensor in attitude determination and reaction wheel momentum dumping system. Recent studies have attempted to use the magnetometer when other attitude sensor, such as star tracker, fails. The differences between the measured and computed the Earth's magnetic field components are spacecraft attitude errors. In this paper, we propose extended Kalman filter(EKF) to determine spacecraft attitude with the magnetometer data and gyro-measured body rates. We develop and simulate this algorithm using MATLAB/SIMULINK. This algorithm can be used as a backup attitude determination system.

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MAGNETOMETER 측정자료와 지구자기장을 이용한 소형 인공위성의 자세 결정 (ATTITUDE DETERMINATION OF MICRO-SATELLITE USING GEOMAGNETISE AND MAGNETOMETER DATA)

  • 석재호;최규홍
    • Journal of Astronomy and Space Sciences
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    • v.9 no.2
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    • pp.203-212
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    • 1992
  • 인공위성의 자세결정을 위해 3축 magnetometer에 의해 측정된 지구 자기장의 자료와 IGRF 모델(tilted-eccentric dipole 모델)을 사용하였다. 지구자기장 모델으 값들을 계산하여 magnetometer 측정자료들과 비교해 보았고 이것으로부터 두 자세각 $\alpha$ 각과 $\beta$들을 구하였다. 이 두 각들을 이용하여 자세결정에 사용되는 Z 축과 자기장의 수직성분 사이의 실 자세각 $\gamma$ 에 대한 bound $\gamma1$$\gamma2$를 계산하여 UoSAT-11, 14, 22의 자세 상태를 알아보았다.

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마이크로컴퓨터를 이용한 자체 보상형 flux-gate 마그네토미터제작 (Self Compensating Flux-gate Magnetometer Using Microcomputer)

  • 가은미;손대락;손동환
    • 한국자기학회지
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    • v.12 no.4
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    • pp.149-153
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    • 2002
  • 지구자기장 이하의 저자기장 측정에 있어서 소형이고 소비전력이 작으면서 장기적 안정성이 요구되는 분야에 flux-gate 마그네토미터를 많이 사용하고 있다. 또한 많은 저자기장 측정분야가 지구자기장의 크기측정보다는 지자장의 변화를 측정하는 경우가 많기 때문에, 본 연구에서 측정범위가 $\pm$1,000 nT, 5pT/√Hz (at 1 Hz)인 flux-gate센서를 사용 $\pm$50000 nT인 지구자기장을 순차적 근사법으로 보상한 후 지구자기장의 변화를 고감도로 측정할 수 있는 3-축의 flux-gate 마그네토미터를 개발하였다.

PRELIMINARY REPORT: DESIGN AND TEST RESULTS OF KSR-3 ROCKET MAGNETOMETERS

  • Kim, Hyo-Min;Jang, Min-Hwan;Lee, Dong-Hun;Ji, Jong-Hyun;Kim, Sun-Mi;Son, De-Rac;Hwang, Seung-Hyun
    • Journal of Astronomy and Space Sciences
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    • v.17 no.2
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    • pp.317-328
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    • 2000
  • The solar wind contributes to the formation of unique space environment called the Earth's magnetosphere by various interactions with the Earth's magnetic field. Thus the solar-terrestrial environment affects the Earth's magnetic field, which can be observed with an instrument for the magnetic field measurement, the magnetometer usually mounted on the rocket and the satellite and based on the ground observatory. The magnetometer is a useful instrument for the spacecraft attitude control as well as the Earth's magnetic field measurements for the spacecraft purpose. In this paper, we present the preliminary design and test results of the two onboard magnetometers of KARI's (Korea Aerospace Research Institute) sounding rocket, KSR-3, which will be launched four times during the period of 2001-02. The KSR-3 magnetometers consist of the fluxgate magnetometer, MAG/AIM (Attitude Information Magnetometer) for acquiring the rocket flight attitude information, and of the search-coil magnetometer, MAG/SIM (Scientific Investigation Magnetometer) for the observation of the Earth's magnetic field fluctuations. With the MAG/AIM, the 3-axis attitude information can be acquired by the comparison of the resulting dc magnetic vector field with the IGRF (International Geomagnetic Reference Field). The Earth's magnetic field fluctuations ranging from 10 to 1,000 Hz can also be observed with the MAG/SIM measurement.

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A Low-noise Double Relaxation Oscillation SQUID Magnetometer for Measuring Magnetoencephalogram

  • 강찬석;이용호;권혁찬;김진목;윤병운
    • Progress in Superconductivity
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    • v.3 no.2
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    • pp.151-158
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    • 2002
  • We developed a useful SQUID magnetometer for biomagnetic applications, magnetoencepha-logram(MEG) and magnetocardiogram(MCG), etc. The SQUIDs are based on Double Relaxation Oscillation SQUID(DROS). DROS consists of two SQUIDs(signal SQUID and reference SQUID) in series, and a relaxation circuit of an inductor and a resistor. Specially we used single reference junction instead of the reference SQUID. The SQUIDs are based on hysteretic $Nb/AlO_{x}$Nb junctions, fabricated by using a simple four level process. Because DROS magnetometer has large flux-to-voltage transfer coefficient, we can use simple flux-locked loop electronics fur SQUID operation. When the DROS magnetometer was operated inside a magnetically shielded room, its average magnetic field noise was about 3 (equation omitted) at 100 Hz. This noise level is low enough to measure biomagnetic fields. In this paper, we describe noise characteristics of DROS magnetometer, depending on the operation condition . .

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직류 자력계의 제작 (Construction of a Direct Current Magnetometer)

  • 장충근
    • 센서학회지
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    • v.5 no.4
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    • pp.9-15
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    • 1996
  • 자기저항 센서로부터 얻은 자기 신호를 표시하기 위하여 직류 자력계를 설계하고, 그 회로를 구현하였다. 제작한 자력계 및 상용 MAG-01 자력계로 측정한 자장은 서로 잘 일치하였고, 제작한 자력계의 자동 범위선택기능, 애널로그 출력기능 및 벡터 감지기능이 양호하였다. 자력계의 측정범위는 $1\;{\mu}T{\sim}1.999\;mT$였고, 분해능은 1 Hz의 밴드폭에서 -132 dB였으며, 측정한 자장은 $3{\cdot}1/2$-digit LED로 표시되었다.

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Construction of Korean Space Weather Prediction Center: Magnetometer

  • Kim, Khan-Hyuk;Choi, Seong-Hwan;Cho, Kyung-Seok;Park, Young-Deuk;Choi, Kyu-Chul
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • pp.32.3-32.3
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    • 2008
  • Solar and Space Weather Research Group in Korea Astronomy & Space Science Institute (KASI) has been funded for "Construction of Korean Space Weather Prediction Center" from Korean government. It has started since 2007 February and is planed as a 5-year project. The goal of this project is to develop a space weather warning and prediction system by the next solar maximum. KASI installed a magnetometer at Mt. Bohyun, which is about 200 km south-east apart from KASI, in 2007 September. After finishing test observations of the magnetometer for the period from September 2007 to January 2008, KASI has operated the magnetometer to monitor geomagnetic field variations associated with space weather effect. Ground-based magnetometers are critical for understanding geomagnetic disturbances in the near-Earth space environment, which are caused by solar wind variations. In this talk, we introduce science topics to be done with the data from KASI magnetometer and also discuss how they are related to space weather phenomena.

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