Radar operation in a spectrally dense environment is nowadays a very challenging problem due to the increasing demand of spectral resources for defence/surveillance applications, remote sensing capabilities, and civilian wireless services. This article explores the technical feasibility of radar waveforms capable of ensuring spectral coexistence with overlaid emitters via a modern digital arbitrary waveform generator. To this end, a specific hardware-in-the-loop test bed is designed to mimic the perception-action cycle necessary for the agile management of the radio spectrum. Then, a spectrum analyzer (SA) and a digital oscilloscope (DO) are used to demonstrate the compliance of the synthesized waveforms with the theoretical counterparts. In particular, the SA is used to establish if the synthesized waveforms fulfil the spectral requirements forced at the design stage. The DO, instead, is used to assess the adherence of synthesized signals ambiguity function (AF) with the theoretical one. For the considered case studies, results highlight that the synthesized waveforms enable spectral compatibility between radar and communication systems and exhibit desirable AF properties.

中文翻译：

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评估基于测量数据的认知雷达的敏捷频谱管理

由于国防/监视应用、遥感能力和民用无线服务对频谱资源的需求不断增加，频谱密集环境中的雷达操作现在是一个非常具有挑战性的问题。本文探讨了能够通过现代数字任意波形发生器确保与重叠发射器频谱共存的雷达波形的技术可行性。为此，设计了一个特定的硬件在环测试台来模拟敏捷管理无线电频谱所需的感知-动作循环。然后，使用频谱分析仪 (SA) 和数字示波器 (DO) 来证明合成波形与理论波形的一致性。特别是，SA 用于确定合成波形是否满足设计阶段强制的频谱要求。相反，DO 用于评估合成信号模糊函数 (AF) 与理论函数的一致性。对于所考虑的案例研究，结果强调合成波形能够实现雷达和通信系统之间的频谱兼容性，并表现出理想的 AF 特性。