Short pulse acquisition by low sampling rate with phase-coded sequence in lidar system

Long Wu; Jiajia Xu; Wentao Lv; Xiaocheng Yang

doi:10.1117/12.2246210

4 November 2016 Short pulse acquisition by low sampling rate with phase-coded sequence in lidar system

Long Wu, Jiajia Xu, Wentao Lv, Xiaocheng Yang

Proceedings Volume 10026, Real-time Photonic Measurements, Data Management, and Processing II; 1002617 (2016) https://doi.org/10.1117/12.2246210
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

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.

Citation Download Citation

Long Wu, Jiajia Xu, Wentao Lv, and 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); https://doi.org/10.1117/12.2246210

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KEYWORDS

Signal detection

Sensors

LIDAR

Modulation

Imaging systems

Pulsed laser operation

Signal generators

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