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星载GPS定位和定轨的益处已在有限的几项卫星任务(如PoSAT-1)上得到验证。GPS姿态确定是个复杂的问题,它已是人们进行大量研究的一个主题,但能从轨道任务中获取的信息还非常少。最近SSTL在与ESA的合作中已着手开始一项计划,研制具体针对小卫星的GPS接收机。其设计不但是为了定位而且还要进行姿态确定试验。此项研制任务资金预算有限,进度安排紧,并且利用先进的商业技术。这种GPS接收机有5根天线,24路GPS L1相关通道,采用一个32位低功耗RISC处理器。在不久的将来,将用两项任务在轨演示这种GPS接收机。一项任务是将于1997年7月发射的TMSAT,另一项是将于1997年12月发射的UoAT-12。这项研制计划允许将新软件上行装载于在轨GPS接收机上,以便地面对测量量进行分析,并用新的在轨姿态确定算法进行试验。
The benefits of on-board GPS positioning and orbit determination have been validated on a limited number of satellite missions such as PoSAT-1. GPS pose determination is a complex issue that has been a subject of much research by people, but very little information is available from orbit missions. Recently, SSTL has partnered with ESA to start a project to develop GPS receivers that target small satellites. Its design is not only for positioning but also for attitude determination tests. This development task has a limited funding budget, tight schedule, and advanced commercial technology. The GPS receiver has five antennas, 24 GPS L1-related channels and uses a 32-bit low-power RISC processor. In the near future, two missions will be used to demonstrate this GPS receiver on-orbit. One of the tasks is TMSAT to be launched in July 1997 and the other is UoAT-12 to be launched in December 1997. The development plan allows new software to be uploaded to the on-orbit GPS receiver for surface-to-surface measurements and tested with the new on-orbit attitude determination algorithm.