论文标题
基于IEEE 802.11AD波形在V2i通信中的雷达成像
Radar Imaging Based on IEEE 802.11ad Waveform in V2I Communications
论文作者
论文摘要
由于大多数车辆雷达系统已经在利用毫米波（MMWave）光谱，因此通过将通信频率扩展到MMWave频段来实现联合雷达和通信系统将变得更加可行。在本文中，提出了用于车辆设置的IEEE 802.11AD基于波形的雷达成像技术。路边单元（RSU）将IEEE 802.11AD波形传输到通信的车辆，而RSU也倾听传输波形的回声以执行逆合合成孔径雷达（ISAR）成像。为了获得车辆的高分辨率图像，RSU需要准确估计车辆的往返延误，多普勒偏移和速度。拟议的ISAR成像首先使用IEEE 802.11AD序言中GoLay互补序列的良好相关性能估算往返延迟。然后，使用从回声信号的最小平方估计获得多普勒偏移，并进行了精制以补偿相位旋转引起的相位包裹。使用运动方程式和估计的多普勒偏移确定车辆的速度。仿真结果验证了所提出的技术能够从具有不同观点的逼真的车辆设置的点散射器模型中形成高分辨率ISAR图像。拟议的ISAR成像技术可用于各种车辆应用，例如交通状况分析或高级碰撞警告系统。
Since most of vehicular radar systems are already exploiting millimeter-wave (mmWave) spectra, it would become much more feasible to implement a joint radar and communication system by extending communication frequencies into the mmWave band. In this paper, an IEEE 802.11ad waveform-based radar imaging technique is proposed for vehicular settings. A roadside unit (RSU) transmits the IEEE 802.11ad waveform to a vehicle for communications while the RSU also listens to the echoes of transmitted waveform to perform inverse synthetic aperture radar (ISAR) imaging. To obtain high-resolution images of the vehicle, the RSU needs to accurately estimate round-trip delays, Doppler shifts, and velocity of vehicle. The proposed ISAR imaging first estimates the round-trip delays using a good correlation property of Golay complementary sequences in the IEEE 802.11ad preamble. The Doppler shifts are then obtained using least square estimation from the echo signals and refined to compensate phase wrapping caused by phase rotation. The velocity of vehicle is determined using an equation of motion and the estimated Doppler shifts. Simulation results verify that the proposed technique is able to form high-resolution ISAR images from point scatterer models of realistic vehicular settings with different viewpoints. The proposed ISAR imaging technique can be used for various vehicular applications, e.g., traffic condition analyses or advanced collision warning systems.
