| DC 欄位 |
值 |
語言 |
| DC.contributor | 光機電工程研究所 | zh_TW |
| DC.creator | 黃冠笙 | zh_TW |
| DC.creator | Guan-Sheng Huang | en_US |
| dc.date.accessioned | 2009-7-23T07:39:07Z | |
| dc.date.available | 2009-7-23T07:39:07Z | |
| dc.date.issued | 2009 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=963207008 | |
| dc.contributor.department | 光機電工程研究所 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 本論文研究以用於即時星象模擬器之亮度分佈演算法為目標。演算法
的核心在於運用顯示畫面的一組像素的亮度分佈來模擬星體資料庫中的
恆星亮度及位置，並且可以即時更新畫面以滿足追星儀的影像擷取速率。
由於像素的亮度有限，因此一個恆星的星等的總亮度會由多個像素的亮度
總和來模擬，而恆星在視野裡的位置則由調整各像素的亮度所形成的亮度
重心來模擬。模擬計算所得的亮度與位置的誤差因模擬的星等而異，一等
星亮度及位置誤差分別為+-0.15%及0.008pixel，越暗的星模擬誤差越大，
六等星為+- 6%及0.25pixel。若以NASA 的SWAS 衛星星象追蹤儀所用的
任務星體資料庫為模擬的依據，設定視域對角線的夾角為40 度 ，以
1024x768 像素解析度來顯示星象，則視域裡需要模擬的恆星數最多約250
顆，而畫面的最長更新時間為32ms。因此模擬器的效能可以滿足測試星
象追蹤儀的需求。
| zh_TW |
| dc.description.abstract | This research is to develop the distribution algorithm of star
brightness utilized in a real-time stellar image generator. The
core computation is to determine the brightness distribution of a
group of brightness limited pixels to represent the brightness of
a star and the location of the star by the brightness weighted
geometric center of the pixels. The accuracy of brightness and
positioning of a star simulation obtained is dependent upon its
magnitude. The maximum deviation in brightness is +- 0.15% for
magnitude 1 and +- 6% for magnitude 6, while the position error is
0.008 and 0.25 pixel respectively. The maximum image update time
is 32ms when the simulation field of view is 40 degree by 1024x 768
pixels based on the onboard star tracker catalog of NASA SWAS
Satellite. Number of stars in this simulation may reach
250.Therefore, the efficiency of stellar image simulator can match
the requirement of the star tracker test.
| en_US |
| DC.subject | 星象追蹤儀 | zh_TW |
| DC.subject | 光學激發器 | zh_TW |
| DC.subject | 星象儀 | zh_TW |
| DC.subject | 星象模擬器 | zh_TW |
| DC.subject | 星體亮度分佈演算法 | zh_TW |
| DC.subject | celestial globe | en_US |
| DC.subject | stellar image simulator | en_US |
| DC.subject | star tracker optical simulator | en_US |
| DC.subject | star globe | en_US |
| DC.subject | computation of brightness distribution for star image simulation | en_US |
| DC.title | 星象模擬器之開發 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | N/A | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |