Range-Doppler imaging of moving target with chirped AM ladar

Chun-bo Liu; Fang Lu; Yanjie Zhao; Xiang'e Han

doi:10.1117/12.900958

22 August 2011 Range-Doppler imaging of moving target with chirped AM ladar

Chun-bo Liu, Fang Lu, Yanjie Zhao, Xiang'e Han

Proceedings Volume 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging; 81923H (2011) https://doi.org/10.1117/12.900958
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

As the result of the synthetic aperture radar technique applied to laser band, SAIL (synthetic aperture imaging ladar) can provide range-Doppler image of targets with much more high-resolution than its counterpart in microwave band. However, the complicated structure of coherent heterodyne detection and the significant impacts of laser atmospheric effect, target depolarization, phase error arising from platform vibration on heterodyne detection efficiency degrades its performance. In this paper, an APD and semiconductor laser based range-Doppler imaging ladar is presented. The ladar combines the (inverse) synthetic aperture technique and direct detection and can obtain the high-resolution image at a relative low cost and complexity. In the meanwhile, owing to the poor coherence of semiconductor laser, the impact of atmospheric effect on laser pattern can be released to some extent. Firstly, the system diagram is presented and the components are briefly introduced; Secondly, the operation principle and performance are formulated detailedly; and then the parameters determination of the chirped AM waveform is analyzed considering the extraction of the range and velocity and the fine resolution. Finally, the 1-D range and 2-D range-Doppler imaging procedure are numerically simulated based on the given target model, which shows that the proposed imaging ladar is effective and feasible.

Citation Download Citation

Chun-bo Liu, Fang Lu, Yanjie Zhao, and Xiang'e Han "Range-Doppler imaging of moving target with chirped AM ladar", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 81923H (22 August 2011); https://doi.org/10.1117/12.900958

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KEYWORDS

LIDAR

Semiconductor lasers

Modulation

Imaging systems

Image resolution

Avalanche photodetectors

Digital signal processing

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