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T-방식과 M-방식을 이용한 저궤도위성용 반작용 휠의 속도측정보드 설계
이재녕(Jae-Nyeung Lee),박성훈(Sung-Hun Park),허수진(Su-Jin Heu),이윤기(Yun-Ki Lee) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.9
본 논문에서는 저궤도 위성의 반작용 휠 속도 측정을 위해 M-방식과 T-방식 모두 검출 가능한 보드를 설계하여 두 방식의 장점을 이용할 수 있도록 하고, 실제 위성탑재컴퓨터에 장착하여 시험을 수행하고 이를 통하여 그 설계의 유용성을 검증한다. 위성에서 반작용 휠은 위성의 자세를 변화시킬 수 있는 대표적인 구동기의 하나로 반작용 휠 구동모터의 회전에 의해 발생하는 회전관성에 의해 자세 제어를 수행하게 된다. 반작용 휠의 회전속도를 검출하는 방법으로는 일정한 주기 T 동안 발생된 반작용 휠 내부 타코 펄스를 세어 휠의 속도를 검출하는 M-방식과 휠에서 발생되는 타코 펄스들 간의 시간을 측정해서 속도를 검출하는 T-방식으로 나눌 수 있다. M-방식은 구현이 간단하고 측정 시간이 일정하다는 장점이 있으나, 저속에서는 속도 측정 분해능이 떨어진다는 단점이 있다. 그에 반해, 타코 펄스간의 시간을 측정하는 T-방식은 저속에서 정밀한 속도를 측정할 수 있으며 측정에 따른 시간 지연이 작다는 장점이 있다. 그러나 이 방법 역시 실제 구현에 있어서 연산이 복잡하고 속도에 따라 연산 속도가 달라진다는 단점이 있다. In this paper, we will design the speed measurement board of LEO Satellites reaction wheel which has two speed measuring methods as M-Method type and T-Method type. therefore we can use the advantage of two methods. and we will verify the availability of design on the on-board computer at the real LEO Satellite(KOMPSAT-3). In the reaction wheels satellite that can change the satellite’s attitude is one of the leading drivers by the rotational inertia of the motor will perform attitude control. Reaction methods for detecting wheel rotation speed generated during a certain period T internal reaction wheel tacho pulse counting M-Method to detect wheel speed and wheel tacho pulses are generated by measuring the time between the detection rate can be divided into T-Method. M-method is simple to implement and benefit measurement time is constant, but slow fall in the velocity measurement accuracy is a disadvantage. In contrast, the time between tacho pulses to measure the T-Method to measure the precise speed at low speed and to measure the time delay is small, has the advantage. However, this method also in the actual implementation and the complexity of the operation at different speeds depending on the speed of operation has the disadvantage.
항공기 제어용 DSP CPU보드 검증용 Emulator 설계
이재녕(Jae-Nyeung Lee),고정호(Jeong-Ho Gob),이현석(Hyun-Seock Lee),이원철(One-Cheol Lee),정주용(Ju-Yong Jung) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Argue about type analysis and trend for modem flight control computer based on DSP CPU board and verification method of flight operation software in this treatise. That serve to verify DSP CPU Board's operating state that is used much on modem electronic digital flight control computer in this treatise recognize about existent verification method and design in treatise that see and argue about concept and function of monitor device for exclusive hardware verification that embody and explain about special quality of this device. Hear after in conclusion trend and to treat and argue breifly than go forward do.
항공제어 운영 소프트웨어의 모니터링 시스템에 관한 연구
이현석(Hyun-Seock Lee),고정호(Jung-Ho Goh),이재녕(Jae-Nyeung Lee),장종진(Jong-Jin Jang),이기훈(Gi-Hoon Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we will discuss about monitoring facilities for flight control system. The Flight Control System needsa safety and reliability. When a Flight Control System is developed, it makes much important to design but also to test for system. The monitoring facilities use to verify and validate a flight control system. In flight condition, air vehicle would get bunch of sensor data. in real time. We should support a similar condition to air on ground. In this time, Processor Interface monitor all of sensor data and calculated, calibrated data.
고정호(Jeong-ho Goh),이현석(Hyun-seock Lee),이재녕(Jae-nyeung Lee),장종진(Jong-jin Jang) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we will discuss about real-time monitoring method for operational system. The operational system needs a safety and reliability. When a flight control system is developed, it makes much important to design but also to test for system. The monitoring method use to verify and validate a flight control operational system. In flight condition, air vehicle would get bunch of sensor data. in real time. We should support a similar condition to air on ground. In this time, Processor Interface monitor all of sensor data and calculated, calibrated data. PI system is consists of hardware section and software section.