Fast range estimation based on active range-gated imaging for coastal surveillance

Qingshan Kong; Yinan Cao; Xinwei Wang; Youwan Tong; Yan Zhou; Yuliang Liu

doi:10.1117/12.999673

21 November 2012 Fast range estimation based on active range-gated imaging for coastal surveillance

Qingshan Kong, Yinan Cao, Xinwei Wang, Youwan Tong, Yan Zhou, Yuliang Liu

Proceedings Volume 8558, Optoelectronic Imaging and Multimedia Technology II; 855824 (2012) https://doi.org/10.1117/12.999673
Event: Photonics Asia, 2012, Beijing, China

Abstract

Coastal surveillance is very important because it is useful for search and rescue, illegal immigration, or harbor security and so on. Furthermore, range estimation is critical for precisely detecting the target. Range-gated laser imaging sensor is suitable for high accuracy range especially in night and no moonlight. Generally, before detecting the target, it is necessary to change delay time till the target is captured. There are two operating mode for range-gated imaging sensor, one is passive imaging mode, and the other is gate viewing mode. Firstly, the sensor is passive mode, only capturing scenes by ICCD, once the object appears in the range of monitoring area, we can obtain the course range of the target according to the imaging geometry/projecting transform. Then, the sensor is gate viewing mode, applying micro second laser pulses and sensor gate width, we can get the range of targets by at least two continuous images with trapezoid-shaped range intensity profile. This technique enables super-resolution depth mapping with a reduction of imaging data processing. Based on the first step, we can calculate the rough value and quickly fix delay time which the target is detected. This technique has overcome the depth resolution limitation for 3D active imaging and enables super-resolution depth mapping with a reduction of imaging data processing. By the two steps, we can quickly obtain the distance between the object and sensor.

Citation Download Citation

Qingshan Kong, Yinan Cao, Xinwei Wang, Youwan Tong, Yan Zhou, and Yuliang Liu "Fast range estimation based on active range-gated imaging for coastal surveillance", Proc. SPIE 8558, Optoelectronic Imaging and Multimedia Technology II, 855824 (21 November 2012); https://doi.org/10.1117/12.999673

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