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A performance comparison between a SCAT-1 DGPS system and the Omnistar DGPS system

机译：SCAT-1 DGPS系统和Omnistar DGPS系统之间的性能比较

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The Global Hawk UAV (Unmanned Aerial Vehicle) was developed by the Northrop Grumman's Ryan Aeronautical Center to perform high altitude reconnaissance. The initial design of the Global Hawk navigation system utilized a RTCA DO-217 compliant special category 1 (SCAT-1) differential GPS (DGPS) system to provide sufficient navigation accuracy for taxi, takeoff and landing operations. The SCAT-1 DGPS system consists of a ground station that produces the differential corrections, a data link transmitter to uplink the corrections to the aircraft, a data link receiver in the aircraft and a GPS receiver able to utilize differential GPS corrections. The SCAT-1 DGPS system has been shown, both during flight tests of the navigation system in a company owned King Air, and during actual flights of the UAV to provide more than sufficient accuracy for takeoff and landing operations. At the point in time that the Global Hawk was to fly outside of the Edwards Air Force Base restricted airspace, discussions were held relative to off field landings. The problem raised relative to getting in and out of an emergency landing field was how to provide differential corrections to the aircraft in such a situation. It was undesirable to have to install a SCAT-1 DGPS ground station at each of the anticipated emergency landing fields. It was at this juncture that the use of commercially available world-wide DGPS services was investigated. The system chosen for providing DGPS corrections to the aircraft in the event of an emergency landing is Omnistar. This paper will describe the system implementation of the Omnistar on board Global Hawk, and will provide data comparing the accuracy of this system against the accuracy of the SCAT-1 DGPS system initially designed into the UAV.
机译：诺斯罗普·格鲁曼公司的赖安航空中心研发了“全球鹰”无人机，以进行高空侦察。 Global Hawk导航系统的初始设计使用了符合RTCA DO-217的特殊类别1（SCAT-1）差分GPS（DGPS）系统，以为滑行，起飞和着陆操作提供足够的导航精度。 SCAT-1 DGPS系统由产生差分校正的地面站，将校正上行链路传输到飞机的数据链路发送器，飞机中的数据链路接收器以及能够利用差分GPS校正的GPS接收器组成。已经展示了SCAT-1 DGPS系统，包括在公司拥有的King Air公司的导航系统的飞行测试期间以及在无人机的实际飞行期间，它们都为起飞和着陆操作提供了足够的精度。在全球鹰即将飞出爱德华兹空军基地受限空域的时候，就场外着陆进行了讨论。与进出紧急着陆场有关的问题是在这种情况下如何对飞机进行差异校正。不希望在每个预期的紧急着陆场都安装SCAT-1 DGPS地面站。正是在这一时刻，对使用商业可用的全球DGPS服务的情况进行了调查。选择用于在紧急着陆时为飞机提供DGPS校正的系统是Omnistar。本文将描述“全球鹰”上的Omnistar的系统实现，并提供将本系统的精度与最初设计用于无人机的SCAT-1 DGPS系统的精度进行比较的数据。

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