In this letter, we present for the first time a method to estimate the bistatic Doppler frequency of a target with clock asynchronous and mobile Integrated Sensing And Communication (ISAC) devices. Existing approaches have separately tackled the presence of phase offsets due to clock asynchrony or the additional Doppler shift due to device movement. However, in real ISAC scenarios, these two sources of phase nuisance are concurrently present, making the estimation of the target’s Doppler frequency particularly challenging. Our method solves the problem using the sole wireless signal at the receiver, exploiting the invariance of phase offsets across multipath components and the bistatic geometry in an original way. The proposed method is validated via simulation, exploring the impact of different system parameters. Numerical results show that our approach is a viable way of estimating Doppler frequency in bistatic asynchronous ISAC scenarios with mobile devices.

中文翻译：

---

使用异步移动设备进行双基地多普勒频率估计，用于集成传感和通信


在这封信中，我们首次提出了一种使用时钟异步和移动集成传感和通信 （ISAC） 设备估计目标的双基地多普勒频率的方法。现有方法分别解决了由于时钟异步而导致的相位偏移或由于设备移动而导致的额外多普勒频移的存在。然而，在实际的 ISAC 场景中，这两个相位干扰源同时存在，这使得估计目标的多普勒频率特别具有挑战性。我们的方法使用接收器上的唯一无线信号解决了这个问题，以原始的方式利用了多路径组件和双基地几何之间的相位偏移的不变性。通过仿真验证了所提方法，探讨了不同系统参数的影响。数值结果表明，我们的方法是在移动设备的双基地异步 ISAC 场景中估计多普勒频率的可行方法。