• Title/Summary/Keyword: 지형의 영향

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Distance error of monopulse radar in cross-eye jamming using terrain bounce (지형 바운스를 이용하는 크로스 아이 재밍의 모노펄스 레이다 거리 오차)

  • Lim, Joong-Soo;Chae, Gyoo-Soo
    • Journal of Convergence for Information Technology
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    • v.12 no.4
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    • pp.9-13
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    • 2022

  • In this paper, the tracking error of monopulse radar caused by cross-eye jamming using terrain bounce is analyzed. Cross-eye jamming is a method of generating an error in a radar tracking system by simultaneously transmitting two signals with different phases and amplitudes. When the monopulse radar receives the cross-eye jamming signal generated by the terrain bounce, a tracking error occurs in the elevation direction. In the presence of multipath, this signal is a combination of the direct target return and a return seemingly emanating from the target image beneath the terrain surface. Terrain bounce jamming has the advantage of using a single jammer, but the space affecting the jamming is limited by the terrain reflection angle and the degree of scattering of the terrain. This study can be usefully used to protect ships from low-altitude missiles or aircraft in the sea.

  • https://doi.org/10.22156/CS4SMB.2022.12.04.009 인용 PDF KSCI

Prediction of the Area Inundated by Lake Effluent According to Hypothetical Collapse Scenarios of Cheonji Ground at Mt. Baekdu (백두산 천지 붕괴 가상 시나리오 별 천지못 유출수의 피해영향범위 예측)

  • Suh, Jangwon;Yi, Huiuk;Kim, Sung-Min;Park, Hyeong-Dong
    • The Journal of Engineering Geology
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    • v.23 no.4
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    • pp.409-425
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    • 2013

  • This study presents a prediction of a time-series of the area inundated by effluent from Heavenly Lake caused by ground behavior prior to a volcanic eruption. A GIS-based hydrological algorithm that considers the multi-flow direction of effluent, the absorption and storage capacity of the ground soil, the storage volume of the basin or the depression terrain, was developed. To analyze the propagation pattern, four hypothetical collapse zones on the cheonji ground were set, considering the topographical characteristics and distributions of volcanic rocks at Mt. Baekdu. The results indicate that at 3 hours after collapse, for both scenarios 1 and 2 (collapses of the entire/southern boundary of cheonji), a flood hazard exists for villages in China, but not for those on the North Korean side of the mountain, due to the topographical characteristics of Mt. Baekdu. It is predicted that villages in both North Korea and China would be significantly damaged by flood inundation at 3 hours elapsed time for both scenarios 3 and 4 (collapses on the southern boundary of cheonji and on the southeastern-peak area).

  • https://doi.org/10.9720/kseg.2013.4.409 인용 PDF KSCI KPUBS HTML

Evaluation of Spatial Characteristic of Wind Corridor Formation in Daegu Area using Satellite Data (위성자료를 활용한 대구지역 바람길생성의 공간적 특성평가)

  • Jung, Eung-Ho;Kim, Dae-Wuk;Ryu, Ji-Won;Cha, Jae-Gyu;Son, Kyung-Su
    • Journal of the Korean Association of Geographic Information Studies
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    • v.11 no.2
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    • pp.73-84
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    • 2008

  • This study has conducted the survey Daegu area on the evaluation of the wind generation by the spatial geograph conditions and according to the elements that practically affecting the generation of the wind. Because the elements affecting the wind generation are very diverse and interrelated, it is very important to secure accurate fundamental datas. For getting these datas, by applying satellite images to the study, more accurate datas were collected and the result of study is summarized as follows First of all, it has been acknowledged that due to the Daegu,s geographic features, there are a lot of areas with high wind generation, but most of these areas have been distributed in the outskirts of the city, where as in the areas wind generation is relatively very low in the urbanized areas, which indicate that the spatial unbalance is very high. And what is more of wind generation in certain areas where places spatially connected to the urbane district, show very low wind generations, and its influenced range become limited. From this fact, it can be estimated that the effects of the wind corridor coming into the urban district will be reduced. And also through this study, it could be verified that there are ample possibility of applying the satellite data as a means of building up the spatial data for evaluation of formation of the wind corridor.

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