This Letter demonstrates the technical capability of millimetre wave pulse-Doppler radar to identify safety-critical operating status information for parked cars. A simple 94-GHz pulsed linear frequency modulated radar with stretch processing on receive provides range-selective detection of small-scale vibration along the length of a parked car. The resulting range-Doppler signature clearly differentiates whether the car's engine is running or not as well as whether the car's transmission is shifting between ‘park’ and ‘drive’. The rotational motion of an opening car door also produces a distinct signature in range-Doppler space. Incorporating this knowledge into future automotive sensors can alert oncoming vehicles to unanticipated actions of parked cars to avert potential damage or injury.

中文翻译：

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使用毫米波脉冲多普勒雷达识别停放汽车的发动机、变速箱和车门的操作

这封信展示了毫米波脉冲多普勒雷达识别停放汽车的安全关键运行状态信息的技术能力。一个简单的 94 GHz 脉冲线性调频雷达在接收时具有拉伸处理功能，可提供沿停放汽车长度的小规模振动的范围选择性检测。由此产生的范围多普勒特征清楚地区分汽车的发动机是否正在运行以及汽车的变速器是否在“停车”和“行驶”之间切换。打开车门的旋转运动也会在距离多普勒空间中产生明显的特征。将这些知识整合到未来的汽车传感器中可以提醒迎面而来的车辆注意停放的汽车的意外行为，以避免潜在的损坏或伤害。