The use of space-based Automatic Dependent Surveillance-Broadcast (ADS-B) receivers to extend aircraft surveillance beyond line-of-sight communication has been discussed since the late 2000s and has been demonstrated in various missions. Although recent demonstrations have relied on small CubeSat platforms, the use of the smallest possible form factor has not been explored. This paper describes development of a spacecraft representing the first use of a 1 U CubeSat platform for aircraft tracking. To comply with the platform's limited power budget, the receiver departs from the typical application of FPGA boards to decoding ADS-B signals and instead employs a general microprocessor. The spacecraft also features some innovations over traditional CubeSat platforms, such as distributed system-level software amenable to extensive code reuse, redundant communications mechanisms, and software-based radiation mitigation strategies. Having designed, built, and integrated all subsystems, as well as performed multiple test campaigns at system and subsystem level, the team now aims at completing formal functional and environmental testing before undergoing the launch campaign, foreseen for 2022.

中文翻译：

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ISTSat-1，天基自动相关监视广播演示 CubeSat 任务

自 2000 年代后期以来，人们一直在讨论使用天基自动相关监视广播 (ADS-B) 接收器将飞机监视扩展到视距通信之外，并已在各种任务中得到证明。尽管最近的演示依赖于小型 CubeSat 平台，但尚未探索使用尽可能小的外形尺寸。本文介绍了航天器的开发，该航天器代表了首次使用 1 U CubeSat 平台进行飞机跟踪。为了符合平台有限的功率预算，接收器脱离了 FPGA 板的典型应用来解码 ADS-B 信号，而是采用了通用微处理器。该航天器还具有对传统 CubeSat 平台的一些创新，例如可以进行广泛代码重用的分布式系统级软件，冗余通信机制和基于软件的辐射缓解策略。在设计、建造和集成了所有子系统，并在系统和子系统级别进行了多次测试活动后，该团队现在的目标是在预计于 2022 年进行发射活动之前完成正式的功能和环境测试。