• Journal of the Institute of Electronics Engineers of Korea SC
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• v.48 no.1
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• pp.1-8
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• 2011

The accuracy of MR sensor-based electronic compass is influenced by the temperature drift and DC offset of the MR sensor and the OP-amp, the magnetic distortion of nearby magnetic materials, and the compass tilt We design the 3-axis MR sensor and accelerometers-based electronic compass which is compensated by the set/reset pulse switching method on the temperature drift and DC offset, by the execution of hard-iron calibration routine on the magnetic distortion, and by the execution of the Euler rotational equation on the compass tilt. We qualitatively analyze the measured azimuth error on the execution of sensitivity calibration routine which is the normalization process on the different sensitivity of each MR sensor and the different gain of each op-amps. This compensation and analytic result make us design the one degree accuracy electronic compass.

• The Journal of the Acoustical Society of Korea
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• v.31 no.8
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• pp.569-579
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• 2012

Typical Tonpilz type underwater acoustic transducers making use of piezoelectric ceramics detect the magnitude of an acoustic pressure, a scalar quantity, and convert this pressure into a proportional output voltage. The scalar sensor has no directional sensitivity. In this paper, we have proposed a new vector sensor based on the Tonpilz transducer structure, which is sensitive to both the magnitude and the azimuthal direction of an acoustic wave. Validity of this new design has been confirmed with analytic equations and finite element analyses.

• Defense and Technology
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• no.8 s.294
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• pp.26-37
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• 2003

지뢰의 제거에서 가장 중요한 요소는 지뢰의 탐지인데, 현재 이용되고 있는 장비들의 성능에는 나름대로 장.단점들이 있어 주로 미국과 유럽에서 새로운 지뢰의 센서기수리을 개발하려는 노력이 대단히 활발하게 이루어지고 있다. 캄보디아나 아프간 등 전쟁 또는 내전의 후유증으로 제거되지 않고 방치된 무수히 많은 지뢰들에 의해 민간이니들이 패해가 계속되자 UN을 중심으로 한 소위 '인도적 지뢰제거'(Humanitarian Demining)사업이 펼쳐지게 되면서 선진국을 중심으로 이 분야의 R/D 예산이 늘어나기 시작하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.297-300
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• 2006

카오스 로봇의 하드웨어 구현에서 로봇의 차제 또는 바퀴가 정확하기 자기 위치를 인식하고 지시한 방향과 거리만큼 이동하는 것이 가장 중요하다. 본 논문에서는 방위 측정용으로 사용한 마그네틱 자이로센서를 대체한 새로운 각속도 센서를 사용하여 자기 위치 보정 능력 을 향상시키고 정확한 방향을 움직일 수 있는 카오스 로봇을 설계하였다.

• The Journal of the Acoustical Society of Korea
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• v.20 no.2
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• pp.86-92
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• 2001

Various array processing techniques to identify the noise source position or bearing have been developed. Typical array processing techniques which are based on time delay between received signals at two sensors, are classified as conventional beamforming, correlation function and NAH (Near-Field Acoustic Holography) techniques which have their own characteristics with respect to application field and signal processing method. In this study, correlation function technique which could be applied for broadband noise source detection, is adopted and the effective detection technique is proposed considering the effects of source bandwidth and measurement noise correlation of noise sources. The validity of the Proposed technique is evaluated using the 3-dimensional nonlinear any which does not give 3-dimensional Position or bearing ambiguity

• Journal of Navigation and Port Research
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• v.41 no.4
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• pp.189-194
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• 2017

The Moving Search Radar System (MSRS) monitors sea areas by moving along the coast. Since the radar is initially aligned to the front of the vehicle, it is important to know the changes in the heading azimuth of the vehicle to quickly acquire the target azimuth from the radar after the MSRS has moved. The heading azimuth can be obtained using the gyro compass, the GPS compass or the electronic compass. The electronic compass is suitable for MSRS requiring fast maneuverability due to its small volume, short stabilization time and low price. However, using a geomagnetic sensor may result in an error due to the surrounding magnetic field. Errors can make early automatic tracking of the satellites difficult and can reduce the radar detection accuracy. Therefore, this paper proposes a method to automatically compensate for the error reflecting the correction value on the radar obtained by comparing the reference azimuth calculated by solving the geodesic inverse problem using two coordinates between the radar and the geostationary satellite with the actually-directed azimuth angle of the satellite antenna. The feasibility and convenience of the proposed method were verified by applying it to the MSRS in the field.

• Journal of Navigation and Port Research
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• v.38 no.5
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• pp.457-462
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• 2014

Indoor-positioning systems are useful to various applications. Navigation system is one of the most popular applications, which needs the information of directions of nodes' movements. Specifically the applications should get the information in real-time to properly show the current moving position of a node. In this paper, simple vector-based algorithms are proposed to compute amount and direction of changes of azimuth of mobile nodes' heading directions using existing indoor positioning systems in indoor environments where azimuth sensors do not work properly. Previous algorithms calculate the azimuth changes by too many steps of topology-based formula. The algorithms proposed in this paper get the amount of changes of azimuth by simple formula based on vector, and determine the direction of changes by the sign of value of simple formula based on the previous movement of nodes. The algorithms are much simpler and less error-prone than previous ones, and then they can detect changes in many location-based applications as well. The performance of the algorithms is proved logically and mathematically.

• Defense and Technology
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• no.2 s.180
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• pp.50-65
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• 1994

다층대공방어체계내에서 구역대공방어요소는 대공전(AAW) 원칙의 중요한 부분을 차지하고 있다. 효과적인 구역방어를 위해서는 공격에 대한 조기경보체계가 필수적이다. 이러한 조기 경보는 항공탑재센서로 제공되며, 만약 탐색능력이 낮은 경우에는 방어 능력의 저하를 초래할 것이다.

• Defense and Technology
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• no.8 s.222
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• pp.78-91
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• 1997

서구 각국은 군의 현대화와 효율성을 제고하기 위해 재래식 탄약에 센서, 전자/통신 및 탄두기술 등과 같은 첨단 기술을 도입, 적용하여 정확도 향상, 사거리 및 탄의 위력을 증대시키고 소량의 탄으로 대량 살상보다는 장갑표적 등과 같은 특정표적을 선별 제압 함으로써 전장에서의 우위를 확보하고자 하고 있다.

• ICROS
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• v.19 no.1
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• pp.32-48
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• 2013

최근 보행자와 차량의 항법 정보(위치, 속도, 자세, 방위각, 등)는 기존의 편의(convenience) 목적의 활용뿐 아니라 안전(safety) 보장을 위한 기반 정보로 활용되고 있으며 이에 대한 원천기술 및 활용기술의 연구개발이 활발하게 이루어지고 있다. 본 고에서는 인프라 기반 및 센서 기반의 다양한 보행자/차량용 항법 기술과 항법용 융합 필터 기술을 설명하고 연구사례를 살펴보고자 한다.