美国空军 ORS试验卫星 TacSat-4 Minotaur IV 9月27日

TacSat-3项目的合作者包括空军研究实验室、ORS办公室、陆军太空与导弹防御司令部、海军研究办公室和国家地理空间情报局。

　TacSat-3的主要仪器是一台高分辨率的超光谱成像仪，ARTEMIS。它能实现制定战术决策的下级指挥官快速询问和接受敌方部队与设备方面的信息。ARTEMIS成像仪的分辨率未知。超光谱成像仪的上一代于2000年搭乘NASA的“地球观测”-1遥感测试卫星升空。由雷神公司制造，TacSat-3卫星平台由阿连特技术公司负责。

　  

TacSat-3发射

TacSat系列战术侦察卫星     

TacSat系列战术侦察卫星,使战场指挥官能够直接指挥、控制战术太空系统,获取战场情报。战场指挥官将使用专用因特网协议的网络来指挥、控制这些战术侦察卫星。TacSat - 1～3均为光学成像卫星,重量在100～400 kg左右,都运行在450 km 高的低地球轨道,分辨率最高达到0. 9m。TacSat - 2还搭载宽频传感器组件,具有搜集各种射频信号(雷达、无线电和手持通信信号)的能力,可对射频目标进行定位并在同圈次对其成像,还可搜集大型船只的A IS信号。TacSat - 2采用了天基通用数据链(CDL) ,可直接与任何兼容地面站的通用数据链进行通信 。TacSat - 3搭载超光谱成像仪,可侦察陆上伪装和隐藏目标,并快速提供目标探测及识别数据、战损评估信息和战场地形信息。TacSat - 4采用了12 000 km高的椭圆轨道(近地点为400 km) ,既能对感兴趣的地区进行较长时间的观察,又可通过适当选择轨道倾角使卫星在观察目标上空持续观测1 h以上(近地轨道卫星只有几分钟) ,另外还能提高通信载荷的利用效率。

TacSat - 4采用了12 000 km高的椭圆轨道(近地点为400 km) ,既能对感兴趣的地区进行较长时间的观察,又可通过适当选择轨道倾角使卫星在观察目标上空持续观测1 h以上(近地轨道卫星只有几分钟) ,另外还能提高通信载荷的利用效率。

NRL position unique elliptic-orbit TacSat-4 satellite for launch
http://www.physorg.com/news/2011 ... -orbit-tacsat-.html
Naval Research Laboratory spacecraft personnel make final preparations to ready the TacSat-4 spacecraft for a May 2011 launch. Transported March 1, to the Kodiak Alaska airport via an Air Force C-17 and trucked to the Alaska Aerospace Kodiak Launch Complex, the TacSat-4 satellite will be launched aboard an Orbital Sciences Minotaur-IV launch vehicle into a highly elliptical orbit (HEO) with an apogee of 12,050 kilometers.

TacSat-4 is a Navy-led joint mission managed by the NRL Naval Center for Space Technology. The mission of TacSat-4 is to experiment with new satellite communications (SATCOM) techniques, augment current SATCOM capabilities, and advance the development of Operationally Responsive Space (ORS) systems for improved responsiveness of space capabilities.

TacSat-4 augments current SATCOM by providing communications-on-the-move (COTM) for existing radios without requiring antenna pointing and providing 10 Ultra High Frequency (UHF) channels that can be used for any combination of communications, data ex-filtration, or Blue Force Tracking — a system that provides military commanders and forces with location information about friendly military forces.

TacSat-4 provides flexible up and down channel assignments, which increases the ability to operate in busy, and sometimes restrictive, UHF environments. The unique orbit of TacSat-4 also augments geosynchronous SATCOM by providing near global, but not continuous, coverage to include the high latitudes.

"The ability to provide communications on the move without having to stop and point a SATCOM antenna was the most important user requirement and one which drove the design of the system," said Mike Hurley, section head, NRL Spacecraft Development.

The NRL Blossom Point Ground Station provides the command and control for TacSat-4 and maintains its user Virtual Mission Operations Center (VMOC) tasking system, allowing dynamic reallocation to different theaters worldwide and enabling rapid SATCOM augmentation when unexpected operations or natural events occur.

NRL position unique elliptic-orbit TacSat-4 satellite for launch
http://www.physorg.com/news/2011 ... -orbit-tacsat-.html
Naval Research Laboratory spacecraft personnel make final preparations to ready the TacSat-4 spacecraft for a May 2011 launch. Transported March 1, to the Kodiak Alaska airport via an Air Force C-17 and trucked to the Alaska Aerospace Kodiak Launch Complex, the TacSat-4 satellite will be launched aboard an Orbital Sciences Minotaur-IV launch vehicle into a highly elliptical orbit (HEO) with an apogee of 12,050 kilometers.

TacSat-4 is a Navy-led joint mission managed by the NRL Naval Center for Space Technology. The mission of TacSat-4 is to experiment with new satellite communications (SATCOM) techniques, augment current SATCOM capabilities, and advance the development of Operationally Responsive Space (ORS) systems for improved responsiveness of space capabilities.

TacSat-4 augments current SATCOM by providing communications-on-the-move (COTM) for existing radios without requiring antenna pointing and providing 10 Ultra High Frequency (UHF) channels that can be used for any combination of communications, data ex-filtration, or Blue Force Tracking — a system that provides military commanders and forces with location information about friendly military forces.

TacSat-4 provides flexible up and down channel assignments, which increases the ability to operate in busy, and sometimes restrictive, UHF environments. The unique orbit of TacSat-4 also augments geosynchronous SATCOM by providing near global, but not continuous, coverage to include the high latitudes.

"The ability to provide communications on the move without having to stop and point a SATCOM antenna was the most important user requirement and one which drove the design of the system," said Mike Hurley, section head, NRL Spacecraft Development.

The NRL Blossom Point Ground Station provides the command and control for TacSat-4 and maintains its user Virtual Mission Operations Center (VMOC) tasking system, allowing dynamic reallocation to different theaters worldwide and enabling rapid SATCOM augmentation when unexpected operations or natural events occur.

TacSat-4 预计9月27日发射。椭圆轨道的战术通讯卫星。



TacSat-4 预计9月27日发射。椭圆轨道的战术通讯卫星。

已发射成功。