Preliminary study on the direct detection of phase coded signal for ranging in ladar

Guangyu Cai; Jianfeng Sun; Ning Zhang; Guangyuan Li; Guo Zhang; Yucheng Jia; Liren Liu

doi:10.1117/12.2185777

4 September 2015 Preliminary study on the direct detection of phase coded signal for ranging in ladar

Guangyu Cai, Jianfeng Sun, Ning Zhang, Guangyuan Li, Guo Zhang, Yucheng Jia, Liren Liu

Proceedings Volume 9617, Unconventional Imaging and Wavefront Sensing 2015; 96170I (2015) https://doi.org/10.1117/12.2185777
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

A structure similar to the direct detection of the DPSK signals using polarization dependent free space Mach-Zehnder interferometer is set up to validate its ability for coherent ranging. M sequence is adopted for its superior performance in code compression. The resultant signal voltage is sampled instead of being zero crossing detected and cross-correlated with the modulation signal sampled at the same rate. The ranging peak appears in the one target setup after proper calibration of the interferometric bias point but doesn’t imply any correct range information. For the two range resolved targets, the output image doesn’t depict two independent peaks. The further study is being conducted.

Citation Download Citation

Guangyu Cai, Jianfeng Sun, Ning Zhang, Guangyuan Li, Guo Zhang, Yucheng Jia, and Liren Liu "Preliminary study on the direct detection of phase coded signal for ranging in ladar", Proc. SPIE 9617, Unconventional Imaging and Wavefront Sensing 2015, 96170I (4 September 2015); https://doi.org/10.1117/12.2185777

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