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two lines element
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     Two.
     二、末日意识
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     7216 showed two lines, B.t.
     B.t.
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     Two.
     二.
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     Characterization of Two Human Cell Lines
     对两株人细胞系的鉴定
     On Lines in Drawing
     线论
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WT5BZ]The satllite remote sensing image processing system described in this paper can be used both on ship and on land and is developed for the purpose of ship route weather forecast of Chinese Antarctic Expedition and sea ice forecast and navigator in Antarctic sea ice region. Adopting the new quick visual programming software DELPHI, developing a 32-bit program suitable to run under the Windows'98 32 bit environment. the nwly devloped receiving system using the WINDOW RXD technology, improving the reliability...

WT5BZ]The satllite remote sensing image processing system described in this paper can be used both on ship and on land and is developed for the purpose of ship route weather forecast of Chinese Antarctic Expedition and sea ice forecast and navigator in Antarctic sea ice region. Adopting the new quick visual programming software DELPHI, developing a 32-bit program suitable to run under the Windows'98 32 bit environment. the nwly devloped receiving system using the WINDOW RXD technology, improving the reliability of real time receiving under the multi task environment under WINDOWS 98. The using of object oriental programming method and open system structure makes it possible to improve and renovate it's function. Using SGP4/SDP4 orbit model and two line elements of orbit parameter to compute the latitude and longitude of the satellite's sub satellite point then developing the program to compute the latitude longitude of all points on the frame line decided by the sub satellite point. Realizing the function to find out every point's latitude and longitude on the 1A image directly and dynamically and completing the quick locating and image displaying function. Using SGP4/SDP4 orbit model and two line elements of orbit parameter to compute the latitude and longitud of the satellite's sub satellite point then developing the program to compute the latitude longitude of all points on the frame line decided by the sub satellite point. Realizing the function to find out every point's latitude and longitude on the 1A image directly and dynamically and completing the quick locating and image displaying function. Using iterating method to draw coastal lines and topography lines on the 1A image according to the electronic map data. this quick and flesible multi function system can be used not only on the ship but also on the land and can display and adding latitude longitude lines and topogsaphy lines in 1-2 minutes. Resolving the difficulty to monitoring Antarctic sea ice and forecast of sea ice slot and free water route. Being capable of making the image scrolling up and down, moving left and right, zooming in and out and cutting and copying freely. It can display any point's geographical location according to mouse moving. Capable of marking any objects on the image like ship position, station position and islands. It can be used to draw the ship route on the image and judge the position of the ship and the surrounding meteorology, marine and sea ice condition on the ship route visually. No reference object during voyaging over the ocean is no longer a problem. It can output 24 bit color satellite image of any size. It has many multi channel incorporating processing model, which can be used to display sea ice, iceberg, cloud, temperature, forest fire and anomaly changes in the ocean and on the land. This system has played an important role in ship routing weather forecast and navigating in sea ice region during the 14,15 and 16 Chinese Antarctic Scientific Expedition and Chinese First Arctic Scientific Expedition. Providing important thereunder in the research on the Arctic and Antarctic sea ice atmosphere interation. [WT5HZ]

船载卫星遥感图象处理系统是针对南极考察气象航线预报、冰区航行的海冰预报和导航需要而研制的船陆两用多功能软件系统。采用了最新的 DEL PHI可视化软件开发工具 ,开发了用于 WINDOWS98环境下的 32位的程序 ,并针对接收系统开发了 WINDOWS设备驱动程序 ,提高了在 WIND0 WS98多任务环境下 ,接收程序的实时性和可靠性 ;采用面向对象的程序开发方法和开放式的体系结构 ,便于功能的更新和提高 ;采用 SGP4/SDP4轨道模式及两行元素的轨道参数计算出卫星星下点的位置 ,实现了在 1 A图象上计算逐点经纬度的快速动态定位和图象显示的功能 ;采用迭代法利用电子地图网格数据 ,在接收的卫星云图上迭代套上地形及海岸线。组成了适合船陆两用的多功能快速灵活的图象处理系统 ,可以在 1~ 2分钟瞬间内完成一幅图的定位套网格和套地形线的工作。解决了南极海冰监测和冰缝、水道预报的难点。可以使图象上下滚动、左右移动、任意放大、缩小和剪取 ;可以随着鼠标的移动显示出图上任意一点的经纬度 ;能够在图上标出任意目标物 ,如船位、站位、岛屿等等 ;能够方便地在图上画出航线 ,直观地判断船所处的位置和航线周围的气象和海...

船载卫星遥感图象处理系统是针对南极考察气象航线预报、冰区航行的海冰预报和导航需要而研制的船陆两用多功能软件系统。采用了最新的 DEL PHI可视化软件开发工具 ,开发了用于 WINDOWS98环境下的 32位的程序 ,并针对接收系统开发了 WINDOWS设备驱动程序 ,提高了在 WIND0 WS98多任务环境下 ,接收程序的实时性和可靠性 ;采用面向对象的程序开发方法和开放式的体系结构 ,便于功能的更新和提高 ;采用 SGP4/SDP4轨道模式及两行元素的轨道参数计算出卫星星下点的位置 ,实现了在 1 A图象上计算逐点经纬度的快速动态定位和图象显示的功能 ;采用迭代法利用电子地图网格数据 ,在接收的卫星云图上迭代套上地形及海岸线。组成了适合船陆两用的多功能快速灵活的图象处理系统 ,可以在 1~ 2分钟瞬间内完成一幅图的定位套网格和套地形线的工作。解决了南极海冰监测和冰缝、水道预报的难点。可以使图象上下滚动、左右移动、任意放大、缩小和剪取 ;可以随着鼠标的移动显示出图上任意一点的经纬度 ;能够在图上标出任意目标物 ,如船位、站位、岛屿等等 ;能够方便地在图上画出航线 ,直观地判断船所处的位置和航线周围的气象和海洋环境状况 ;解决了在茫茫海洋和冰区中航行找不到参照物时的困惑 :能够输出任意大小的 2 4位真?

HY-1 Satellite was launched successfully on May 15th, 2002. It is the first ocean color observation satellite in China. On the other hand it is the first long life experimental and operational small satellite in China. The on-board GPS receiver was successfully used in navigation and give out the precise time. The positioning principle, flow chart and application of the GPS receiver on HY-1 satellite are introduced in this paper. A method to confirm and verify the on orbit positioning data is discussed. Using...

HY-1 Satellite was launched successfully on May 15th, 2002. It is the first ocean color observation satellite in China. On the other hand it is the first long life experimental and operational small satellite in China. The on-board GPS receiver was successfully used in navigation and give out the precise time. The positioning principle, flow chart and application of the GPS receiver on HY-1 satellite are introduced in this paper. A method to confirm and verify the on orbit positioning data is discussed. Using the Two Line Elements (TLE) from NASA web, the satellite orbit is calculated by the Satellite Tool Kit (STK) software so to obtain the nadir positions, then, the real GPS data at that time are processed and converted to the nadir positions. The nadir geodetic positions from GPS data are compared with those from the TLE. The difference of nadir positions between GPS and TLE methods are given. It is very helpful to give the comparison using the real on-board data.

简要介绍了海洋一号卫星星载GPS接收机的定位原理、流程和应用,探讨了一种在轨定位结果的确认和互验方法。借助于卫星工具包软件(STK),利用NASA网站公布的HY-1卫星两行根数(TLE)进行卫星轨道推算,生成星下点位置,并与相应时刻星载GPS接收机实测数据得到的星下点位置进行比较,由此得到两种方法定位结果之间的偏差,用实际在轨数据验证了两者的位置符合程度。

Since the number of targets near the earth orbit has already been beyond 9000, it is necessary and much important to analyze targets near the mission orbit to bring the mission to access both before the launch and during the orbital mission. NORAD maintains general element perturbation element sets (Two-Line Element Sets, TLEs) on all resident space objects. In turn, these element sets are provided to users. These element sets are periodically refined so as to maintain...

Since the number of targets near the earth orbit has already been beyond 9000, it is necessary and much important to analyze targets near the mission orbit to bring the mission to access both before the launch and during the orbital mission. NORAD maintains general element perturbation element sets (Two-Line Element Sets, TLEs) on all resident space objects. In turn, these element sets are provided to users. These element sets are periodically refined so as to maintain a reasonable prediction capability on all space objects. At the same time, NORAD developed a set of models named SGP/SDP series as models for propagation of NORAD element sets. Five mathematical models for prediction of satellite position and velocity are available. And the NORAD element sets are currently generated with either SGP4 or SDP4 depending on whether the satellite is near-Earth or deep-space. These two models, SGP4 for "near-earth" objects and SDP4 for "deep space" objects, are widely used in satellite tracking software and can produce very accurate results when used with current NORAD two-line element datum. A brief review is taken at these element sets and propagation models first. Then through the precision analysis, it is believed that using SGP4/SDP4 models for taking quick collision alert among space targets is suitable. Based on this conclusion, an orbit debris environment and collision alert system was designed. In this system, targets and the corresponding TLEs are saved in a database based on MS SQL Server, and the data visual is realized by OpenGL. The orbit propagation models being used is SGP4/SDP4 since this model is the generator of current TLEs and will be supported in the future.

在轨编目航天器数目已超过了9000,为了保证航天任务的顺利完成,必须对可能威胁到任务轨道的空间目标进行分析.文章首先对两行轨道根数和SGP4/SDP4轨道预报模型进行了分析,在此基础上建立了空间目标数据库及空间碎片环境与碰撞预警仿真和数据可视化系统.

 
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