4 November 2016 Short pulse acquisition by low sampling rate with phase-coded sequence in lidar system
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Abstract
The requirement of high range resolution results in impractical collection of every returned laser pulse due to the limited response speed of imaging detectors. This paper proposes a phase coded sequence acquisition method for signal preprocessing. The system employs an m-sequence with N bits for demonstration with the detector controlled to accumulate N+1 bits of the echo signals to deduce one single returned laser pulse. An indoor experiment achieved 2 μs resolution with the sampling period of 28 μs by employing a 15-bit m-sequence. This method shows the potential to improve the detection capabilities of narrow laser pulses with the detectors at a low frame rate, especially for the imaging lidar systems. Meanwhile, the lidar system is able to improve the range resolution with available detectors of restricted performance.
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Long Wu, Jiajia Xu, Wentao Lv, Xiaocheng Yang, "Short pulse acquisition by low sampling rate with phase-coded sequence in lidar system", Proc. SPIE 10026, Real-time Photonic Measurements, Data Management, and Processing II, 1002617 (4 November 2016); doi: 10.1117/12.2246210; https://doi.org/10.1117/12.2246210
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