In this work, we exploit the radar clutter (i.e., the ensemble of echoes generated by the terrain and/or the surrounding objects in response to the signal emitted by a radar transmitter) as a carrier signal to enable an ambient basckscatter communication from a source (tag) to a destination (reader). Upon deriving a convenient signal model, we exploit the fact that the radar clutter is periodic over time scales shorter than the coherence time of the environment, because so is the radar excitation, to distinguish the message sent by the tag from the superimposed ambient interference. In particular, we propose two encoding/decoding schemes that do not require any coordination with the radar transmitter or knowledge of the radar waveform. Different tradeoffs in terms of transmission rate and error probability can be obtained upon changing the control signal driving the tag switch or the adopted encoding rule; also, multiple tags can be accommodated with either a sourced or an unsourced multiple access strategy.

翻译：在这项工作中,我们利用雷达阵列(即地形和(或)周围物体响应雷达发射机发出的信号而产生的回声集合)作为载体信号,以便从源头(标签)到目的地(阅读器)进行环绕火箭散射通信。在生成一个方便的信号模型时,我们利用雷达阵列的周期比环境的一致性时间短,因为雷达引言也是这样,以区分标记发出的信息和超常环境干扰。特别是,我们建议两种编码/解码办法,不需要与雷达发射机进行任何协调,也不需要雷达波形知识。在改变驱动标记开关或采用编码规则的控制信号时,可以取得不同的传输率和误差概率的权衡;此外,可以通过源码或无源的多重访问策略来容纳多个标记。