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다중빔 방식의 FMCW 레이더 표적신호 시뮬레이터 개발
이승연,최덕선,정영헌,이석재,윤주홍,Lee, Seung-Youn,Choe, Tok-Son,Jung, Young-Hun,Lee, Seok-Jae,Yoon, Joo-Hong 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3
To detect targets for autonomous navigation of unmanned ground vehicle, mounted sensors are required to work all-weather condition. In this point of view, the FMCW radar is quietly appropriate. In this paper, we present development results of target signal simulator for multi-beam type FMCW radar. A target signal simulator make pseudo target signals which simulates multiple moving targets. And we describe how to make hit information for each target in multi-beam type radar. The developed methods are utilized for target tracking device. Moreover it can be applied to similar target signal simulator.
복잡한 환경에서 다중표적추적을 위한 고속 트랙병합 기법
이승연,윤주홍,이석재,정영헌,최덕선,Lee, Seung-Youn,Yoon, Joo-Hong,Lee, Seok-Jae,Jung, Young-Hun,Choe, Tok-Son 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4
In this paper, we proposed a method of fast track merging which is the foundation of track to track association technique. The existing method of track merging is performed throughout comparison between tracks to tracks. Therefore, it has heavy calculation time. In our research, we developed a method for fast clustering by using nearest neighbor measurement identification. The simulation results show that the proposed method is more faster than previous method about 3.3%. We expect that this method could be effectively used in multi-target tracking particularly in heavy clutter environment.
이승연,Lee, Seung-Youn 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3
Adequate segmentation of target objects from the background plays an important role for the performance of automatic target recognition(ATR) system. This paper presents a new segmentation algorithm using fuzzy thresholding to extract a target. The proposed algorithm consists of two steps. In the first step, the region of interest(ROI) including the target can be automatically selected by the proposed robust method based on the frame difference of each image sensor. In the second step, fuzzy thresholding with a proposed membership function is performed within the only ROI selected in the first step. The proposed membership function is based on the similarity of intensity and the adjacency of target area on each image. Experimental results applied to real CCD/IR images show a good performance and the proposed algorithm is expected to enhance the performance of ATR system using multi-sensors.
이승연,곽동민,성기열,Lee, Seung-Youn,Kwak, Dong-Min,Sung, Gi-Yeul 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.4
The ability to navigate autonomously in off-road terrain is the most critical technology needed for Unmanned Ground Vehicles(UGV). In this paper, we present a method for vision-based terrain cover classification using DCT features. To classify the terrain, we acquire image from a CCD sensor, then the image is divided into fixed size of blocks. And each block transformed into DCT image then extracts features which reflect frequency band characteristics. Neural network classifier is used to classify the features. The proposed method is validated and verified through many experiments and we compare it with wavelet feature based method. The results show that the proposed method is more efficiently classify the terrain-cover than wavelet feature based one.
이승연(Seung-Youn Lee),나채동(Chae-Dong Na) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.4
본 논문에서는 한국 지형에 적합한 지상파 ATSC DTV용 채널 모델을 제시하였다. 이를 위해 지상파 DTV 방송과 관련된 기존 전파 모델을 연구하고, 한국방송공사에서 실시한 지상파 DTV 방송 필드테스트의 실측 데이터를 분석하였다. 실제 측정한 전계강도를 기반으로 제시한 채널 모델은 기존의 전파모델에 비해 더 정확한 값을 가진다. 제시한 채널 모델은 지상파 DTV 시스템 실행시 요구되는 link budget 계산에 유용할 것이다. In this paper we proposed channel models for terrestrial ATSC (Advanced Television Systems Committee) DTV (Digital Television) system in South Korea. For the purpose of this model, we research on propagation model involved in terrestrial DTV system and analyze out field test data of terrestrial DTV broadcasting carried out in korean Broadcasting System. Using the measured values of received field strength, newly proposed Path-loss models have more correctly than that of conventional Path-loss models. This models can be utilized usefully for the efficient ATSC DTV system implementation requiring accurate link-budget calculation