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该节主要选取2018-12-01和2019-04-15的激光测距数据进行处理。
部分测量数据处理结果如表1所示,测量中激光脉宽5.7 ns,数据预处理为自动处理,过程中无需人为干预。
Code
(name)Date RMS before correction/m RMS after correction/m Accuracy improvement/m Remarks 10517 2019-04-15 1.898 1.759 13.9 1st pass 10517 2019-04-15 2.115 2.046 6.9 2nd pass 38355 2019-04-15 1.883 1.809 7.4 04139 2018-12-01 1.514 1.491 2.3 07364 2018-12-01 1.807 1.756 5.1 22237 2018-12-01 1.174 1.048 12.6 22285 2018-12-01 1.488 1.468 2.0 hy2a 2018-12-01 0.861 0.780 8.1 Mean ~7.2 Table 1. Correction results of time offset between channels
从表1中可以看出通过通道间时间偏差修正能有效提高精度,表中修正前后内符合精度(RMS)平均提高约7.2 cm。
其中2019-04-15日10571-1数据预处理结果如图10所示;2018-12-1日hy2a数据预处理结果如图11所示。
Figure 10. 10571 data preprocessing results. (a) Original data, (b) signal identification results, (c) histogram statistics of fitting residual after correction
Figure 11. hy2a data preprocessing results. (a) Original data, (b) signal identification results, (c) histogram statistics of fitting residual after correction
修正通道间的时间偏差后,再次进行数据拟合,结果如表2所示,内符合精度(RMS)平均提高约3.2 cm。
Code
(name)Date RMS after correction/m RMS further processing/m Accuracy improvement/cm Remarks 10517 2019-04-15 1.759 1.717 4.2 1st pass 10517 2019-04-15 2.046 2.039 0.7 2nd pass 38355 2019-04-15 1.809 1.794 1.5 04139 2018-12-01 1.491 1.489 0.2 07364 2018-12-01 1.756 1.646 11.0 22237 2018-12-01 1.048 1.030 1.8 22285 2018-12-01 1.468 1.435 3.3 hy2a 2018-12-01 0.780 0.746 3.4 Mean ~3.2 Table 2. RMS of further processing
Preprocessing method of laser ranging data based on array detection technology
doi: 10.3788/IRLA20190561
- Received Date: 2019-12-10
- Rev Recd Date: 2020-01-12
- Available Online: 2020-09-22
- Publish Date: 2020-08-28
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Key words:
- laser ranging data preprocessing /
- multi-channel /
- multi-peak Gaussian fitting /
- cross- correlation analysis /
- Poisson statistical analysis
Abstract: Array detection technology is of great significance to the laser ranging system for space debris with extremely weak echo signals, because array detection technology can improve the probability of detection success in laser ranging of space targets. Focusing on this new laser ranging technology, the preprocessing method of laser ranging data based on array detection technology was researched in this paper. The research was based on general preprocessing method of satellite laser ranging data. According to the characteristics of the array of Superconducting Nanowire Single Photon Detector (SNSPD), together with the methods of ground target measurement and the methods of multi-peak Gaussian fitting & cross correlation analysis, the time offset correction between channels of the multi-channel laser ranging data was realized. Poisson statistical analysis and cyclic fitting filter were used to realize signals automatic identification and data fitting of multi-channel laser ranging data, etc. At present, this data preprocessing method has been successfully applied in the experiment of 4 × 4 array laser ranging experiment platform of Yunnan Observatory, Chinese Academy of Sciences, this method can correct the time offset between channels of multi-channel laser ranging data, and the application of this data preprocessing method has achieved good results.