Basic resources for communication satellites are communication radio-frequencies and satellite orbits. An orbit is the trajectory followed by the satellite. The communication between the satellite and a ground station...Basic resources for communication satellites are communication radio-frequencies and satellite orbits. An orbit is the trajectory followed by the satellite. The communication between the satellite and a ground station is established only when the satellite is consolidated in its own orbit and it is visible from the ground station. Different types of orbits are possible, each suitable for a specific application or mission. Most used orbits are circular, categorized as low, medium and geosynchronous (geostationary) orbits based on the attitude above the Earths surface. The launching process heading the satellite in geostationary orbit, by the first step places the satellite in a transfer orbit. The transfer orbit is elliptical in shape with low attitude at perigee, and the apogee of the geostationary orbit attitude. The apogee of the parking orbit depends on the injection velocity applied at perigee. Simulation approach of injection velocity at perigee to attain different apogees, considering an incremental step is presented in this paper.展开更多
爱克发公司近日宣布将推出：Apogee Media 6内容管理和编辑创意软件。
这款基于互联网的软件包将数字资产管理与一个XML编辑工作流程平台整合在一起，并采用全新的互动式flatplan。flatplan能让用户拖放页面并点击近日工作流程中的其...爱克发公司近日宣布将推出：Apogee Media 6内容管理和编辑创意软件。
这款基于互联网的软件包将数字资产管理与一个XML编辑工作流程平台整合在一起，并采用全新的互动式flatplan。flatplan能让用户拖放页面并点击近日工作流程中的其他模块，这意味着用户可以对内容和版式进行更多控制。展开更多
屡获奖项的爱克发的Apogee Series 3——爱普极工作流程解决方案第三代版本,拥有更高的自动化程度、可控制性、开放性和可升级性,而且更加易用。作为工作定义格式(JDF)标准的发起人之一,爱克发使Apogee series 3与JDF完全兼容,进一步扩...屡获奖项的爱克发的Apogee Series 3——爱普极工作流程解决方案第三代版本,拥有更高的自动化程度、可控制性、开放性和可升级性,而且更加易用。作为工作定义格式(JDF)标准的发起人之一,爱克发使Apogee series 3与JDF完全兼容,进一步扩展和简化整个工作流程。展开更多
文摘Basic resources for communication satellites are communication radio-frequencies and satellite orbits. An orbit is the trajectory followed by the satellite. The communication between the satellite and a ground station is established only when the satellite is consolidated in its own orbit and it is visible from the ground station. Different types of orbits are possible, each suitable for a specific application or mission. Most used orbits are circular, categorized as low, medium and geosynchronous (geostationary) orbits based on the attitude above the Earths surface. The launching process heading the satellite in geostationary orbit, by the first step places the satellite in a transfer orbit. The transfer orbit is elliptical in shape with low attitude at perigee, and the apogee of the geostationary orbit attitude. The apogee of the parking orbit depends on the injection velocity applied at perigee. Simulation approach of injection velocity at perigee to attain different apogees, considering an incremental step is presented in this paper.
文摘爱克发公司近日宣布将推出：Apogee Media 6内容管理和编辑创意软件。
这款基于互联网的软件包将数字资产管理与一个XML编辑工作流程平台整合在一起，并采用全新的互动式flatplan。flatplan能让用户拖放页面并点击近日工作流程中的其他模块，这意味着用户可以对内容和版式进行更多控制。
