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首页> 外文会议>Proceedings of the national technical meeting : "Vision 2010: Present and future" >An Innovative GPS Solution for the ORBCOMM Constellation Spacecraft
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An Innovative GPS Solution for the ORBCOMM Constellation Spacecraft

机译：ORBCOMM星座航天器的创新GPS解决方案

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ORBCOMM is a low cost, two-way data messaging system that uses a constellation of 36 spacecraft to provide global coverage. The constellation spacecraft require GPS for navigation and time synchronization. The GPS-provided navigation information is used onboard for magnetometer-based attitude determination and is also transmitted to ORBCOMM subscribers for terrestrial position determination. In addition, the GPS navigation data are used for ground-based orbit determination for the entire constellation. Absolute andrnrelative time outputs from the GPS receiver are utilized by the spacecraft's time control loops to provide microsecond level time synchronization on the spacecraft.rnIn the presence of very tight cost, mass, power, and volume constraints, the GPS subsystem was designed using commercially available low-cost hardware and management software that was developed in-house. The Rockwell MPE-I five channel GPS receiver was modified for use onboard the ORBCOMM spacecraft. Most of the hardware, including the GPS receiver, had not flown in space prior to the ORBCOMM mission and was successfully up-screened for space flight. The result is a low cost GPS subsystem that is ideal for meeting the requirements of small spacecraft constellations.rnThis paper provides a description of the hardware and software elements of the ORBCOMM GPS subsystem and presents flight performance data that illustrate the successful and innovative utilization of commercially available hardware to meet ORBCOMM's navigation and time synchronization requirements.
机译：ORBCOMM是一种低成本的双向数据消息传递系统，它使用36个航天器星座来提供全球覆盖。星座航天器需要GPS进行导航和时间同步。 GPS提供的导航信息在船上用于基于磁力计的姿态确定，还被传输给ORBCOMM用户，用于确定地面位置。此外，GPS导航数据用于确定整个星座的地面轨道。 GPS接收器的绝对和相对时间输出被航天器的时间控制环利用，以在航天器上提供微秒级的时间同步。rn由于存在非常严格的成本，质量，功率和体积限制，GPS子系统的设计使用了市售的内部开发的低成本硬件和管理软件。罗克韦尔MPE-I五通道GPS接收器经过修改，可以在ORBCOMM航天器上使用。在执行ORBCOMM任务之前，大多数硬件（包括GPS接收器）都没有在太空飞行，并且已经成功地进行了太空飞行的上筛检查。结果是一个低成本的GPS子系统，非常适合满足小型航天器星座的要求。本文提供了ORBCOMM GPS子系统的硬件和软件元素的描述，并提供了飞行性能数据，这些数据说明了商业上成功和创新的利用满足ORBCOMM的导航和时间同步要求的可用硬件。

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