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GPS 유도폭탄 개발용 PILS 적용을 위한 MEMS IMU 시뮬레이터 설계
신동호,권승복,오상헌,정일영 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4
PILS (Processor-in-the-loop simulation)은 유도무기, 무인항공기 등의 시스템 개발 시 실제 하드웨어를 적용하기 이전에 각 부 시스템의 물리/수학적 모델을 적용하여 실제 운용 환경을 유사하게 모의함으로써 반복적인 시험을 수행할 수 있도록 하여 전체 시스템의 신뢰도를 향상시키는데 유용하게 사용되고 있다. GPS 유도폭탄은 IMU와 GPS 수신기를 결합한 IMU/GPS 통합항법장치를 내장한 유도조종키트에 의하여 사전에 입력된 목표점을 타격하는 무기체계로서 최종 탄착 정확도는 IMU의 성능에 크게 좌우된다. 따라서 이를 개발하기 위한 PILS 환경을 구성 시 실제 적용하는 IMU의 오차 모델이 적절하게 반영 되어야만 신뢰할 수 있는 시뮬레이션 결과를 획득할 수 있다. 본 논문에서는 GPS 유도폭탄 개발용 PILS 적용을 위한 IMU의 시뮬레이터를 설계한 결과를 제시한다. A PILS was used to improve the reliability of guidance and navigation system of missle and unmaned aerial vehicle. The PILS is carried out by simulating physical environement with mathematical model before develepment of real hardware subsystem. The GPS guided bomb is one of the smart munition which can be guided by GPS/INS integrated navigation system autonomously to strike a pre-aimed target and final delivery accuracy is dependent on the performance of IMU. Since accurate IMU error model should be properly applied to obtain reliable and accurate result during the PILS testing. This paper proposes the design of MEMS IMU simulator for PILS of GPS guided bomb.
오상헌,손석보,권승복,신동호 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
최근 국내외에서 재래식 폭탄의 정확도와 사거리를 향상시킨 정밀 유도 무기에 관한 연구가 활발하게 진행 중에 있다. 국내에서는 국방과학연구소의 주도로 재래식 폭탄에 GAK(GPS Adapter Kit)를 장착하는 연구가 진행 중이다. GAK는 GPS/INS 복합 항법 모듈을 내장한 사거리 연장 유도 키트의 일종으로 폭탄이 투하되면 접혀 있던 날개가 전개되고 이후 날개의 플래퍼론을 구동하여 유도 조종을 수행한다. 복합 항법 모듈은 상용의 MEMS IMU, 내장형 GPS 수신기 및 항법 컴퓨터와 실시간 운영체제에서 구동되는 항법 소프트웨어로 구성된다. 본 논문에서는 복합 항법 모듈의 비행 시험 결과를 제시하였다. 시험 결과 항법 모듈이 실시간으로 정상적인 동작을 수행하였으며 GPS 유도 폭탄의 유도조종에 적합한 항법 정보를 제공하였음을 확인하였다.
조경환,문상찬,윤석창,권승복,김도형,양일영 항공우주시스템공학회 2022 항공우주시스템공학회지 Vol.16 No.5
In this paper, we have obtained the acceleration coefficient of the IMU (Inertial Measurement Unit) to prove reliability by analyzing the characteristic of the MEMS IMU installed in guided weapon systems for overseas export and the operating environment of the guided weapon system. Additionally, based on designed life testing, we performed life tests on three the IMUs and demonstrated a target lifetime of 12 years.
단시간 푸리에 변환과 전역 통과 필터 기반 노치 필터를 이용한 다중 주파수 제거 기법
차재혁,김예준,박찬국,김광훈,권승복 제어·로봇·시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.6
This paper proposes a novel multiple frequency rejection technique based on the STFT (Short-Time Fourier Transform) and APNF (All-Pass filter-based Notch Filter). Because a non-adaptive multiple notch filter cannot track the target frequencies, an adaptive filter is often used. However, the existing adaptive notch filters cannot accurately identify the number of frequencies, which may deteriorate the filtering performance. Furthermore, a time-frequency analysis can be performed to simultaneously estimate the number of target frequencies and track them. Therefore, a novel adaptive multiple notch filtering method is developed, adopting the STFT at the front end of APNF. In particular, an interpolation scheme is adopted to compensate for the low frequency resolution of STFT. This framework exhibits a smaller amplitude response distortion for the pass-band compared to that in cascade-type multiple notch filters and can thus reject the time-varying frequencies. A MATLAB simulation is performed to verify the performance of the proposed method. The results confirm that the proposed scheme outperforms the conventional adaptive notch filter in removing chirp signals and temporary signals. .
정준우,양기정,박성열,강행익,권승복,김갑진 사단법인 항법시스템학회 2019 Journal of Positioning, Navigation, and Timing Vol.8 No.3
A method that applies space-time adaptive signal processing (STAP) algorithm based on an array antenna consisting of multiple antenna elements has been known to be effective to remove wide-band jamming signals in GPS receivers. However, the occurrence of phase distortion in navigation signals has been a problem when navigation signals, from which jamming signals are removed using STAP, are supplied to global positioning system (GPS) receivers. This paper verified the navigation performance degradation as a result of phase distortion. To mitigate this phenomenon, this paper proposes a mode switching scheme, in which a bypass mode is adopted to make the best use of the tracking performance of receivers without performing signal processing when jamming signals are not present or weak, and a STAP mode is employed when jamming signals exceed the threshold value. In this paper, the mode switching scheme is proposed for two environments: when receivers are stationary, and when receivers are moving. This paper confirmed that the performance of position error improved because phase distortion could be excluded due to STAP if the bypass mode was adopted under a condition where the jamming signal power level was below the threshold value in an environment where receivers were stationary. However, this paper also observed that the navigation failed due to the instability of tracking performance of receivers due to phase distortion that occurred at the switching time, although the number of switching could be reduced dramatically by proposing a dual threshold scheme of on- and off-thresholds that switched a mode due to the array antenna characteristics of varying gains according to the jamming signal incident direction in an environment where receivers were moving. The analysis results verified that running the STAP algorithm at all times is more efficient than the mode switching, in terms of maintaining stable navigation and ensuring position error performance, to remove jamming signals in an environment where receivers were moving.