Nanosatellites are revolutionizing the space industry allowing low-cost educational, scientific or commercial space missions. Among them, the CubeSats play a key role due to their standardization and increasingly use. As the CubeSat missions become more and more complex and challenging, so do their subsystems. In particular, the position, velocity and attitude of the satellite are commonly required to perform orbital tracking, precise pointing towards some sector of the Earth and other relevant tasks. These requirements can be fulfilled using an appropriate GPS receiver. This work presents the design and development of a Global Positioning System (GPS) receiver (including hardware, software, and programmable logic) oriented to CubeSats along with some experimental results obtained with the first integrated prototype. The receiver can process the L1 and L2 GPS civil signals providing, in addition to the Position Velocity and Time (PVT) solution, high-precision pseudorange and carrier-phase measurements. It also has two antenna inputs that allow obtaining a partial attitude estimation or using the receiver as a GPS-based remote sensing sensor. The experimental results obtained from absolute and differential positioning, and partial attitude estimation show the correct working of the receiver and the excellent quality of the generated measurements.

中文翻译：

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双天线双频高性能 Cubesat 兼容 GPS 接收器

纳米卫星正在彻底改变太空工业，允许低成本的教育、科学或商业太空任务。其中，立方体卫星由于其标准化和越来越多的使用而发挥着关键作用。随着 CubeSat 任务变得越来越复杂和具有挑战性，它们的子系统也是如此。特别是，卫星的位置、速度和姿态通常需要执行轨道跟踪、精确指向地球的某些部分和其他相关任务。使用合适的 GPS 接收器可以满足这些要求。这项工作介绍了面向立方体卫星的全球定位系统 (GPS) 接收器（包括硬件、软件和可编程逻辑）的设计和开发，以及第一个集成原型获得的一些实验结果。接收器可以处理 L1 和 L2 GPS 民用信号，除了位置速度和时间 (PVT) 解决方案之外，还提供高精度伪距和载波相位测量。它还具有两个天线输入，允许获得部分姿态估计或将接收器用作基于 GPS 的遥感传感器。从绝对定位和差分定位以及部分姿态估计获得的实验结果表明接收机工作正常，生成的测量结果质量优良。