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首页> 外文会议>International Astronautical Congress(IAC2006); 20061002-06; Valencia(ES) >A Flexible Extension for Pico-Satellite Communication Based On Orbit Operation Results of UWE-1
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A Flexible Extension for Pico-Satellite Communication Based On Orbit Operation Results of UWE-1

机译：基于UWE-1轨道运行结果的微卫星通信的灵活扩展

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摘要

The efficient integration of satellite telecommunication into IP based networks offers still interesting economic potential as well as scientific challenges. In this context telecommunication experiments focussing on analysis of typical delays and noise levels, were one key objective of the University Wuerzburg's Experimental Satellitel (UWE-1), a pico-satellite having been launched in October 2005. As a prerequisite to use IP for the communication between the ground station and LEO satellites, a certain level of reliability and performance of the lower protocol layers is required. A common solution, especially for pico-satellite communication, is the use of HDLC conform protocols like AX.25. The use of AX.25 causes problems due to the lack of a forward error correction (FEC). Furthermore, a suitable implementation of error detection and correction inside AX.25 is not intended to keep up the compatibility. Nevertheless, studies showed that a combination of HDLC with the appropriate forward error correction achieves also good results compared to specialized solutions like CCSDS. This work describes a flexible approach to integrate FEC into a standard AX.25 communication link while keeping compatibility to available standard hardware. This flexible extension can be used optional to standard AX.25 on pico-satellite communication and allows the use of AX.25 in environments with low bandwidth, high delays, and high packet loss.
机译：将卫星电信有效地集成到基于IP的网络中，仍然提供了令人感兴趣的经济潜力以及科学挑战。在这种情况下，专注于典型延迟和噪声水平分析的电信实验是维尔茨堡大学实验卫星（UWE-1）的一个主要目标，该卫星已于2005年10月发射。这是将IP用于卫星通信的前提。在地面站和LEO卫星之间的通信中，要求较低协议层具有一定水平的可靠性和性能。一个常见的解决方案，尤其是对于微卫星通信，是使用像AX.25这样的HDLC兼容协议。由于缺少前向纠错（FEC），使用AX.25会引起问题。此外，AX.25内部错误检测和纠正的适当实现并不旨在保持兼容性。尽管如此，研究表明，与专用解决方案（如CCSDS）相比，将HDLC与适当的前向纠错相结合也可以获得很好的结果。这项工作描述了一种灵活的方法，可以将FEC集成到标准AX.25通信链路中，同时保持与可用标准硬件的兼容性。此灵活扩展可用于微卫星通信中标准AX.25的可选功能，并允许在带宽低，延迟高和丢包率高的环境中使用AX.25。

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