We propose a coherent light detection and ranging (LiDAR) with a low probability of intercept (LPI) based on wavelength hopping technology and phase-encoded random modulation technology to achieve long-range detection while reducing exposure risk. A theoretical analysis is constructed for the LPI LiDAR system. The multi-wavelength homodyne detection and distance estimation are achieved by the broadband 90° optical hybrid and the matched filter, respectively. Measurements are conducted under 1064 nm and 1550 nm due to the limitation of available light sources. The experimental results show that when the emission power of the two wavelengths is low, the designed LPI LiDAR can achieve sensorless detection with high distance accuracy at long distances. The used laser warning device cannot alarm the laser emitted by the designed LiDAR with continuous wave regime. The feasibility of the designed LiDAR system to realize silent detection is verified.
We experimentally construct a polarimetric imaging architecture based on coherent lidar by using the frequency modulated continuous wave (FMCW) and the Risley prism beam steering technology for target identification. By combining coherent detection and multi-channel point cloud fusion, the proposed polarimetric imaging design is exploited to not only achieve the large-scale scene reconstruction in complex environments, but also distinguish the target from other objects with diverse structural materials or camouflage. An outdoor polarimetric imaging experiment which has an imaging scene of ±30° and an angular resolution of 0.1°, is also performed utilizing the proposed architecture. Furthermore, the structures with different polarization characteristics can be displayed by selecting different polarization parameter images, which greatly improves the information dimension of target identification. The polarimetric imaging architecture provides a multi-dimensional perception and open new opportunities for remote sensing, autonomous driving, and military reconnoitering.
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