Double corner reflecter echo data

In this article, a novel method for interferometric target detection that employs coherent echoes and spatial frequency sampling is proposed. Originating from radio astronomy, interferometric passive microwave imaging has become widely applied for the passive microwave remote sensing of Earth. The proposed technique, termed Interferometric Coherent Echo Detection, is a novel active imaging method that capitalizes on coherent echoes to sample the spatial frequency domain. In comparison with traditional active imaging systems, the proposed approach is characterized by an autonomous transceiver system that operates independently. This system negates the requirement for phase synchronization and eliminates the need for specific modulation techniques to be applied to the emitted waveform. Compared to passive imaging techniques, the technique of interferometric target detection using echoes obtained from active transmission reduces the system's receiver sensitivity requirements by using transmitter. The detection methodology presented herein is designed to suppress the spatial coherence of the echo by optimizing the positioning of the transmitter. The theoretical derivation and subsequent simulation validation confirm the feasibility of the proposed echo interference measurement technique. Furthermore, an experimental apparatus incorporating automotive radar chips and a Field-Programmable Gate Array (FPGA) successfully identified multiple target points.

本文提出了一种利用相干回波（coherent echoes）和空间频率采样（spatial frequency sampling）的新型干涉式目标检测（interferometric target detection）方法。源于射电天文学（radio astronomy）的干涉式被动微波成像（interferometric passive microwave imaging）已广泛应用于地球的被动微波遥感（passive microwave remote sensing）领域。

该方法被称为干涉式相干回波检测（Interferometric Coherent Echo Detection），是一种利用相干回波对空间频率域（spatial frequency domain）进行采样的新型主动成像方法（active imaging method）。与传统主动成像系统相比，该方法的特点在于采用独立运行的自主收发系统（autonomous transceiver system），无需相位同步（phase synchronization），也无需对发射波形（emitted waveform）应用特定调制技术（modulation techniques）。

相较于被动成像技术，利用主动发射获取的回波进行干涉式目标检测的方法通过发射机降低了系统对接收机灵敏度的要求。本文提出的检测方法通过优化发射机位置，旨在抑制回波的空间相干性（spatial coherence）。

理论推导（theoretical derivation）及后续仿真验证（simulation validation）证实了所提回波干涉测量技术的可行性。此外，集成车载雷达芯片（automotive radar chips）与现场可编程门阵列（FPGA）的实验装置成功识别了多个目标点。