• International Journal of Control, Automation, and Systems
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• 제6권6호
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• pp.873-883
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• 2008

This paper presents a parametric study on the controller design scheme for a gyro-accelerometer to have robust performance under some parameter variations. In particular, an integral and derivative based controller design method is suggested to achieve the desired performances of stability margin, bandwidth, and uniformity of scale for both gyroscopes and accelerometers with uncertainties of quality factor and resonant frequency. The simulation result shows that the control loop based on the suggested method gives satisfactory performance robustness under parameter variations, demonstrating the usefulness of the proposed design scheme.

• 한국멀티미디어학회논문지
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• 제18권4호
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• pp.565-574
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• 2015

Falls are the main cause of serious injuries and accidental deaths in people over the age of 65. Due to widespread adoption of smartphones, there has been a growing interest in the use of smartphones for detecting human behavior and activities. Modern smartphones are equipped with a wide variety of sensors such as an accelerometer, a gyroscope, camera, GPS, digital compass and microphone. In this paper, we introduce a new method that determines the fall direction of human subjects by analyzing the three axis components of acceleration vector.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.876-881
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• 2003

Reliable attitude estimation during the launch and early orbit phase is a critical issue for a satellite. Typically gyroscopes and other sensors are utilized to estimate the attitude during this phase. It is difficult to estimate the attitude quickly and reliably using gyroscopes because it requires a large computational load and accurate sensor measurements. Furthermore, the gyroscope failure may lead to the loss of the satellite. This paper suggests a simple attitude estimation method of a low earth orbit satellite without using gyroscopes, but only using sun sensors and magnetometers in the sun-acquisition mode. Using Kompsat-I telemetry data, we verified that the suggested algorithm provides attitude estimation within 3 degrees on each axis.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2485-2488
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• 2003

본 논문에서는 DSP를 이용하여 운동하는 물체의 회전량을 측정하는 실린더형 진동 자이로스코프(이하 자이로) 제어기를 개발하였다. 진동 자이로를 구동하기 위해서는 정밀 진동제어와 신호 처리와 같은 고급 제어 기술이 필요하다. 정밀진동제어는 진동 자이로를 구동하기 위해 필요한 핵심기술로써 기존의 PLL(phase-locked loop)방식은 외부환경에 민감하여 구현이 까다로울 뿐만 아니라 자이로 개개의 고유 진동수가 다르기 때문에 대량 생산에 어려움이 있었다. 또한 자이로 출력 신호로부터 회전량을 검출하기 위해서는 진폭과 당향성 검출의 본 회로뿐만 아니라 잡음 제거와 신호 증폭, 온도 보상과 같은 전처리 과정도 필요하다. 본 논문에서는 DSP를 통해 정밀 진동제어와 잡음 제거, 방향성 검출 등의 기능들을 구현하였으며 증폭과 진폭(회전량) 검출은 아날로그 회로를 이용하였다. 또 한 외부와의 인터페이스를 위해 D/A 회로를 설계하였고 이들을 실험을 통해 검증하였다.

• 한국환경과학회지
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• 제23권11호
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• pp.1801-1805
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• 2014

Longshore current is main transportation mean causing movement of bed load and suspended particle in coastal waters, and effective measurement method and suitable equipment for shallow water coastal environment where is frequently exposed to atmosphere. Measurement equipment for longshore drift was designed and miniature model was applied to Gyeongpo beach in May and June, 2014. The equipment consists of three main elements, spheroid outer casing, spheroid inner casing, observation module equipped with GPS. Gyroscope principle was applied to observation module, and GPS receiver always can be directed upwards. Miniature models were installed along Gyeonpo beach, and it was well to track the flow of longshore current. This research described the design and function of the equipment and results of field experiments.

• Journal of Advanced Marine Engineering and Technology
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• 제24권1호
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• pp.119-126
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• 2000

In constructing the positioning system based on a conventional dead-reckoning for a wheeled vehicle with pneumatic tires, the position estimation error is inevitable as changes of the radius of the wheels depend on live load and variable enviroment. Therefore, this paper proposes the positioning system which can estimate the error source i.e. the vehicle parameter errors, such as the right and left wheel radius error, using gyroscope and ultrasonic sensor and correct the parameter to reduce the dead-reckoned position estimation error. The extended Kalman filter was used as a method for the multisensor data fusion. The simulation to verify the effectiveness of the proposed positioning system is performed.

• 제어로봇시스템학회논문지
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• 제6권12호
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• pp.1120-1125
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• 2000

This paper presents a technique for estimating the attitude of a model helicopter at near hovering using a combination of inertial and non-inertial sensors such as gyroscope and potentiometer. To estimate the attitude of helicopter a simplified indirect Kalman filter based on sensor modeling is derived and the characteristics of sensors are studied, which are used in determining the optimal Kalman gain. To verify the effectiveness of the proposed algorithm simulation results are presented with real flight data. Our approach avoids a complex dynamic modeling of helicopter and allows for an elegant combination of various sensor data with different measurement frequencies. We also describe the method of implementation of the algorithm in the model helicopter.

• 한국멀티미디어학회논문지
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• 제19권6호
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• pp.1089-1094
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• 2016

A simulation game represented the real world and situation as a video games, In the first time, this simulation game primarily applied to military practice areas and then it's applied areas were extended to strategy, flighting, racing, life areas. In this paper, we developed the driving simulator that operate the 3-axis sensor attached driver's handle which could forward/backward moving, control of direction, and transmit of gear in the virtual space. For more the realities of the situation and accuracy of the location and speed, we adopted the 3-axis sensing informations, Unreal engine4' and Blueprint.

• Journal of Astronomy and Space Sciences
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• 제23권2호
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• pp.161-166
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• 2006

이 논문에서는 위성 자세제어용으로 사용되는 RLG(Ring Lager Gyroscope) 전류 안정화 회로에 대해서 설명한다. RLG는 헬륨-네온레이저의 공진기 내에서 샤냑효과를 이용한다. 두 방전전류의 차이는 자이로 바이어스 오차의 한 부분을 차지한다. 전류 안정화회로의 이론적 배경과 설계과정에 대해서 기술하고, 입력전압 시험, 온도시험을 통하여 검증하였다.

• 대한안전경영과학회지
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• 제20권2호
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• pp.37-44
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• 2018

The Location Based Service is growing rapidly nowadays due to the universalization of the use for smartphone, and therefore the location determination technology has been placed in a very important position. This study suggests an algorithm that can provide the estimate of users' location by using smartphone sensors. And in doing so we will propose a methodology for the creation and update of indoor map through the more accurate position estimation using smartphone sensors such as acceleration sensor, gyroscope sensor, geomagnetic sensor and rotation sensor.