Influence of Range Gate Width on Detection Probability and Ranging Accuracy of Single Photon Laser Altimetry Satellite

doi:10.11947/j.JGGS.2020.0204

Journal of Geodesy and Geoinformation Science ›› 2020, Vol. 3 ›› Issue (2): 36-44.doi: 10.11947/j.JGGS.2020.0204

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Influence of Range Gate Width on Detection Probability and Ranging Accuracy of Single Photon Laser Altimetry Satellite

Guoyuan LI^1,³,Fanghong YE^1,²,Xinming TANG¹(),Dongping XIE¹,Jiapeng HUANG¹,Genhua HUANG³

1. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China
2. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
3. Key Laboratory of Space Active Opto-electronics Technology, Chinese Academy of Sciences, Shanghai 200038, China

Received:2019-05-29 Accepted:2019-11-29 Online:2020-06-20 Published:2020-07-08
Contact: Xinming TANG E-mail:tangxinming99@qq.com
About author:Guoyuan LI(1984—), male, PhD, research associate, majors in satellite laser altimetry data processing and application.E-mail: ligy@lasac.cn
Supported by:
National Natural Science Foundation of China(41871382);Open Foundation of the Key Laboratory of Space Active Opto-electronics Technology;Chinese Academy of Sciences(2018-ZDKF-1)

Abstract

Abstract:

The influence of the single photon laser altimeter range-gate width on the detection probability and ranging accuracy is discussed and analyzed, according to the LiDAR equation, single photon detection equation and the Monte Carlo method to simulate the experiment. The simulated results show that the probability of detection is not affected by the range gate, while the probability of false alarm is relative to the gate width. When the gate width is 100ns, the ranging accuracy can accord with the requirements of satellite laser altimeter. But when the range gate width exceeds 400ns, ranging accuracy will decline sharply. The noise ratio will be more as long as the range gate to get larger, so the refined filtering algorithm during the data processing is important to extract the useful photons effectively. In order to ensure repeated observation of the same point for 25 times, we deduce the quantitative relation between the footprint size, footprint, and frequency repetition according to the parameters of ICESat-2. The related conclusions can provide some references for the design and the development of the domestic single photon laser altimetry satellite.

Key words: satellite laser altimeter; range gate; ranging accuracy; detection probability; monte carlo; single photon laser

Guoyuan LI,Fanghong YE,Xinming TANG,Dongping XIE,Jiapeng HUANG,Genhua HUANG. Influence of Range Gate Width on Detection Probability and Ranging Accuracy of Single Photon Laser Altimetry Satellite[J]. Journal of Geodesy and Geoinformation Science, 2020, 3(2): 36-44.

Figures/Tables 8

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References 22

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Range-gate width/ns	Detection probability/(%)		False alarm probability/(%)
Range-gate width/ns	Theoretical value	Simulation result	Theoretical value	Simulation result
100	97.43	97.04	2.53	2.71
200	97.43	96.91	2.53	2.77
300	97.43	96.97	2.54	2.78
400	97.43	97.11	2.54	2.71
500	97.43	97.12	2.54	2.72
1000	97.43	97.02	2.55	2.81
4000	97.43	96.91	2.57	3.03
10000	97.43	97.04	2.57	2.95
40000	97.43	97.06	2.57	2.93

Range-gate width/ns	Mean range error/m		Range error standard deviation/m
Range-gate width/ns	Theoretical value	Simulation result	Theoretical value	Simulation result
100	0.016	0.017	0.154	0.154
200	0.002	0.003	0.434	0.433
300	-0.021	-0.020	0.795	0.796
400	-0.054	-0.053 5	1.223	1.223
1000	-0.446	-0.445	4.813	4.814
4000	-7.356	-7.355	37.781	37.783
10000	-44.962	-44.961	143.885	143.890
40000	-639.167	639.163	959.848	959.876

Footprints spacing/m
0.23	5.83	30
0.5	12.5	14
0.7	17.5	10
1	25	7
5	125	1.4
10	250	0.7

Influence of Range Gate Width on Detection Probability and Ranging Accuracy of Single Photon Laser Altimetry Satellite

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