Recovery of Systematic Biases in Laser Altimetry Data Using Natural Surfaces

Filin, Sagi

doi:10.14358/pers.69.11.1235

Cited by 117 publications

(88 citation statements)

References 6 publications

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“…1 (a), which means normal incidence and flat surface with zero slope, the simulated waveforms are nearly the same in different modes of lasers, which corresponds well to the models in Eqs. (9) and (10). The reason is that the first two terms are the same, the third term influenced by slope is input by 0 slope, and the last term is relatively weak in simulation.…”

Section: Resultsmentioning

confidence: 99%

“…1, and calculated the theoretical pulse widths according to Eq. (10). The comparisons between theoretical and simulated waveform widths under different order beams are listed in Table 1, and two groups of waveforms are drawn in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…If the target surface with fluctuant profile is quasi-flat with slope, and by generalizing the theory of Filin [10], the surface slope in the local level coordinate system should be converted into 'modified surface slope' φ in altimeter coordinate system, which is determined as a function of the satellite attitude, laser pointing and the surface slope itself. Then, N can be acquired by integrating signal power S(t) over t, and the integration result is:…”

Section: Altimeter Received Modelmentioning

confidence: 99%

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The Waveform Model of Laser Altimeter System with Flattened Gaussian Laser

Wang

Yang

et al. 2015

Journal of the Optical Society of Korea

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The current waveform model of a laser altimeter is based on a Gaussian laser beam of fundamental mode, while the flattened Gaussian beam has many advantages such as nearly constant energy distribution on the center of the cross-section. Following the theory of the flattened Gaussian beam and the waveform theory of the laser altimeter, some of the primary parameters of the received waveform were derived, and a laser altimetry waveform simulator and waveform processing software were programmed and improved under the circumstance of a flattened Gaussian beam. The result showed that the bias between theoretical and simulated waveforms was less than 3% for every order mode, the waveform width and range error would increase as target slope or order number rose. Under higher order mode, the shapes of the received waveforms were no longer Gaussian, and could be fitted more precisely as a generalized Gaussian function with power bigger than 2. The flattened beam got much better performance for a multi-surface target, especially when the small surface is far from the center of the laser footprint. This article provides the waveform theoretical basis for the use of a flattened Gaussian beam in a laser altimeter.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Altimeter Received Modelmentioning

confidence: 99%

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The Waveform Model of Laser Altimeter System with Flattened Gaussian Laser

Wang

Yang

et al. 2015

Journal of the Optical Society of Korea

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“…The conjugate planar patches cannot coincide together due to the systematic errors in the LiDAR system. Filin 16 proposed a method using natural surfaces to identify bore-sight and range errors based on plane function. He concluded that moderate slopes with different orientations are sufficient for generating reliable results.…”

Section: Introductionmentioning

confidence: 99%

“…Most of these studies concluded that planar patches with different orientations are helpful in reducing the correlations between different system errors. Filin 16 demonstrated that surfaces with positive and negative directions can reduce correlations between system parameters. Habib et al 19 illustrated the optimum configuration of planar patches which were orthogonal to the coordinate axes.…”

Section: Introductionmentioning

confidence: 99%

Improved bore-sight calibration for airborne light detection and ranging using planar patches

Liu

Guo

Wang

et al. 2016

J. Appl. Remote Sens

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, "Improved bore-sight calibration for airborne light detection and ranging using planar patches," J. Appl. Remote Sens. 10(2), 024001 (2016), doi: 10.1117/1.JRS.10.024001. Abstract. Airborne light detection and ranging (LiDAR) system calibration is a crucial procedure for ensuring the accuracy of point data. A common practice is to use conjugate planar patches to recover systematic parameters based on coplanar constraints and to use planes with different orientations to decrease the correlations between the systematic errors. When there are not sufficient planar patches and the configuration of planar patches is not optimal, it is difficult to guarantee the reliability of the estimated system parameters. Based on the analyses of the boresight angle effects, we find that not only the orientations but also the distribution of planar patches play an important role in the calibration procedure. We propose an improved method for bore-sight calibration based on the principles of symmetry of coordinate offsets and low correlations between bore-sight angles. Comparisons of the experimental results of boresight angle calibration suggest that the proposed configuration of conjugate planar patches can decrease the correlations between bore-sight angles and improve the reliability of calibration results. The optical results obtained from four gable-roof buildings are very close to the results calculated by the RiProcess software with a deviation of about 0.001 deg. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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2018

Environmental Applications of Digital Terrain Modeling

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Recovery of Systematic Biases in Laser Altimetry Data Using Natural Surfaces

Cited by 117 publications

References 6 publications

The Waveform Model of Laser Altimeter System with Flattened Gaussian Laser

The Waveform Model of Laser Altimeter System with Flattened Gaussian Laser

Improved bore-sight calibration for airborne light detection and ranging using planar patches

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