NDLI: Mixed pixel return separation for a full-field ranger

Content Provider	IEEE Xplore Digital Library
Author	Godbaz, J.P. Cree, M.J. Dorrington, A.A.
Copyright Year	2008
Description	Author affiliation: Dept. of Eng., Univ. of Waikato, Hamilton (Godbaz, J.P.; Cree, M.J.; Dorrington, A.A.)
Abstract	Full-field amplitude modulated continuous wave range imagers commonly suffer from the mixed pixel problem. This problem is caused by the integration of light from multiple sources by a single pixel, particularly around the edges of objects, resulting in erroneous range measurements. In this paper we present a method for identifying the intensity and range of multiple return values within each pixel, using the harmonic content of the heterodyne beat waveform. Systems capable of measurements at less than 90 degree phase shifts can apply these methods. Our paper builds on previous simulation based work and uses real range data. The method involves the application of the Levy-Fullagar algorithm and the use of the cyclic nature of the beat waveform to extract the mean noise power. We show that this method enables the separation of multiple range sources and also decreases overall ranging error by 30% in the single return case. Error in the two return case was found to increase substantially as relative intensity of the return decreased.
Starting Page	1
Ending Page	6
File Size	257069
Page Count	6
File Format	PDF
ISBN	9781424437801
DOI	10.1109/IVCNZ.2008.4762135
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-26
Publisher Place	New Zealand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase measurement Phase modulation Multiple Returns Amplitude modulation Time measurement Limited Depth of Field Laser radar Deconvolution Sparse Spike Train Image intensifiers Lidar Frequency Mixed Pixels Intensity modulation Optical modulation Pixel AMCW
Content Type	Text
Resource Type	Article

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