With the development of the Internet of Things, FMCW (Frequency Modulated Continuous Wave) radars are widely used in medical treatment, human behavior detection, Internet of Vehicles and UAV (Unmanned Aerial Vehicle) detection. However, the existing systems have some shortcomings, such as high requirements for synchronization signal, lack of flexibility and high design cost. In this paper, to address these problems, a software-synchronization based, flexible, low-cost FMCW radar is proposed. Firstly, the radar uses periodic intermittent slope signal as modulation signal, and analyze echo signal to detect a target with a software synchronization algorithm. Most interestingly, hardware synchronization signal is not needed in the proposed radar as in conventional designs, which greatly facilitate implementation. Secondly, the radar system has a high flexibility due to the use of a software waveform generator and a software data processor. The system is built without expensive integrated chips and equipment, which greatly reduces the design cost. Finally, two groups of experiments under different environments are designed. Through the analysis of the results, it can be seen that the radar system designed in this paper achieves a good accuracy while greatly reduces the design cost and complexity.

中文翻译：

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基于软件同步的、灵活的、低成本的 FMCW 雷达

随着物联网的发展，FMCW（调频连续波）雷达广泛应用于医疗、人类行为检测、车联网和无人机（Unmanned Aerial Vehicle）检测。然而，现有系统存在同步信号要求高、缺乏灵活性、设计成本高等缺点。在本文中，为了解决这些问题，提出了一种基于软件同步的、灵活的、低成本的 FMCW 雷达。首先，雷达采用周期性间歇斜率信号作为调制信号，通过软件同步算法分析回波信号检测目标。最有趣的是，所提出的雷达中不需要像传统设计中那样的硬件同步信号，这极大地促进了实现。第二，由于使用了软件波形发生器和软件数据处理器，雷达系统具有很高的灵活性。该系统无需昂贵的集成芯片和设备，大大降低了设计成本。最后设计了两组不同环境下的实验。通过对结果的分析可以看出，本文设计的雷达系统在实现了良好的精度的同时，大大降低了设计成本和复杂度。