scholarly journals An Entropy-Based Anti-Noise Method for Reducing Ranging Error in Photon Counting Lidar

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1499
Author(s):  
Mingwei Huang ◽  
Zijing Zhang ◽  
Jiaheng Xie ◽  
Jiahuan Li ◽  
Yuan Zhao

Photon counting lidar for long-range detection faces the problem of declining ranging performance caused by background noise. Current anti-noise methods are not robust enough in the case of weak signal and strong background noise, resulting in poor ranging error. In this work, based on the characteristics of the uncertainty of echo signal and noise in photon counting lidar, an entropy-based anti-noise method is proposed to reduce the ranging error under high background noise. Firstly, the photon counting entropy, which is considered as the feature to distinguish signal from noise, is defined to quantify the uncertainty of fluctuation among photon events responding to the Geiger mode avalanche photodiode. Then, the photon counting entropy is combined with a windowing operation to enhance the difference between signal and noise, so as to mitigate the effect of background noise and estimate the time of flight of the laser pulses. Simulation and experimental analysis show that the proposed method improves the anti-noise performance well, and experimental results demonstrate that the proposed method effectively mitigates the effect of background noise to reduce ranging error despite high background noise.

2016 ◽  
Vol 43 (6) ◽  
pp. 0604001
Author(s):  
沈姗姗 Shen Shanshan ◽  
陈钱 Chen Qian ◽  
曹芳 Cao Fang ◽  
何伟基 He Weiji ◽  
顾国华 Gu Guohua

2009 ◽  
Vol 277 (1685) ◽  
pp. 1247-1252 ◽  
Author(s):  
Christina Richardson ◽  
Thierry Lengagne

Effective acoustic communication in the face of intense conspecific background noise constitutes a constant sensory challenge in chorusing and colonial species. An evolutionary approach suggests that behavioural and environmental constraints in these species should have shaped signal design and signalling behaviour to enable communication in noisy conditions. This could be attained both through the use of multicomponent signals and through short-term adjustments in the spatial separation of calling males. We investigated these two hypotheses in a chorusing anuran, the hylid Hyla arborea , through a series of phonotaxis experiments conducted within a six-speaker arena in a high background noise situation, by presenting females with male calls containing either single or multiple attractive call components, and by modifying distances between speakers. We found that female ability to discriminate attractive calls increased when several attractive call components were available, providing novel evidence that the use of multicomponent signals enhances communication in complex acoustic conditions. Signal discrimination in females also improved with speaker separation, demonstrating that within natural choruses, spatial unmasking conditioned by male density and spatial separation probably improves female discrimination of competing males. Implications of these results for the accuracy of mate choice within choruses are discussed.


2020 ◽  
Vol 13 (10) ◽  
pp. 5681-5695
Author(s):  
Bernd Kaifler ◽  
Dimitry Rempel ◽  
Philipp Roßi ◽  
Christian Büdenbender ◽  
Natalie Kaifler ◽  
...  

Abstract. The Balloon Lidar Experiment (BOLIDE) was the first high-power lidar flown and operated successfully on board a balloon platform. As part of the PMC Turbo payload, the instrument acquired high-resolution backscatter profiles of polar mesospheric clouds (PMCs) from an altitude of ∼ 38 km during its maiden ∼ 6 d flight from Esrange, Sweden, to northern Canada in July 2018. We describe the BOLIDE instrument and its development and report on the predicted and actual in-flight performance. Although the instrument suffered from excessively high background noise, we were able to detect PMCs with a volume backscatter coefficient as low as 0.6×10-10 m−1 sr−1 at a vertical resolution of 100 m and a time resolution of 30 s.


2012 ◽  
Vol 49 (12) ◽  
pp. 121202
Author(s):  
王弟男 Wang Dinan ◽  
陈长青 Chen Changqing ◽  
王挺峰 Wang Tingfeng

2013 ◽  
Vol 10 (10) ◽  
pp. 105201 ◽  
Author(s):  
Hui-Ming Qu ◽  
Yi-Fan Zhang ◽  
Zhong-Jie Ji ◽  
Qian Chen

2017 ◽  
Vol 137 ◽  
pp. 356-362 ◽  
Author(s):  
Haiquan Zhao ◽  
Zongsheng Zheng ◽  
Zhongyu Wang ◽  
Badong Chen

Author(s):  
Brian F. Aull ◽  
Daniel R. Schuette ◽  
Douglas J. Young ◽  
David M. Craig ◽  
Bradley J. Felton ◽  
...  

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