Digital laser range finder: phase-shift estimation by undersampling technique

Poujouly, Stephane; Journet, Bernard; Placko, Dominique

doi:10.1109/iecon.1999.819401

Cited by 17 publications

(7 citation statements)

References 4 publications

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“…Then, the first order partial derivative of the function  respecting to variables 0 a and 1 a is shown in (14). And make these two partial derivatives equal to zero.…”

Section:      mentioning

confidence: 99%

“…Research in [12] finds it is sufficient to affect distance measurement with very slight inductive or capacitive coupling in their crosstalk modeling. Besides, with the development of digital processing techniques, the phase-shift LRF is digitizing the signal, and it can achieve better accuracy, references [13,14] propose to make all digital processing chain in the phase-shift LRF. And it is also an effective method to increase the processing of digital bits to improve measurement accuracy and resolution [15].…”

Section: Introductionmentioning

confidence: 99%

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A least-square-based approach to improve the accuracy of laser ranging

Xiao

Zheng

et al. 2014

2014 International Conference on Multisensor Fusion and Information Integration for Intelligent Systems (MFI)

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Laser ranging is an emerging measurement technology in recent decades. In the short-range distance, phaseshift laser ranging has a wide range of applications. To improve the phase-shift laser ranging measurement accuracy, through analyzing principles and characteristics of phase-shift laser ranging, we proposed a novel method based on the least-square method. Then a theoretical model is established and verified by experiment. Later we compute residual sum of squares of leastsquare and residual sum of squares of piecewise linear, and make the average rate of residual sum of squares decrease by 22.06797%.

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“…Then, the first order partial derivative of the function  respecting to variables 0 a and 1 a is shown in (14). And make these two partial derivatives equal to zero.…”

Section:      mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A least-square-based approach to improve the accuracy of laser ranging

Xiao

Zheng

et al. 2014

2014 International Conference on Multisensor Fusion and Information Integration for Intelligent Systems (MFI)

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“…7,8 However, applications of the undersampling method to the pulse method have not been reported. This paper outlines the principle of undersampling with a system configuration and describes several experiments on the newly developed rangefinder.…”

Section: Introductionmentioning

confidence: 98%

High-resolution rangefinder with a pulsed laser developed by an undersampling method

et al. 2010

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A high-resolution rangefinder equipped with a pulsed laser has been developed by introducing a high-resolution interpolation technique based on an undersampling method. Using this pulse method employed by the rangefinder, a new time-scale expansion has been realized that is similar to the heterodyne of the rangefinder that also employs the phase difference method. Therefore, high-resolution measurements are now possible. A bandpass-filtered temperature-compensated crystal oscillator signal with a reference frequency of 15 MHz is sampled at a timing determined by a received pulsed light with a repetition rate of 8.5 kHz. With this process, a time series of undersampled 2.5-kHz data are obtained as an intermediate step that can be further lowered to 85 Hz by final rearrangement of the undersampled data. With this technique, a reference frequency is transformed into a lower frequency. A distance is then calculated from the phase of this low frequency. The rangefinder developed shows good performances that include a range resolution of better than 1 mm, nonlinearity within ±1 mm, and a measurement range of up to 7000 m.

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“…[1−4] The largest disadvantage of active mode was poor concealment. [5] Although 1.54 µm, 10.4 µm or other eye invisible spectral band lasers were used to improve the concealment, [6,7] the lasers could still be detected by a proper photo detector. Therefore, it is difficult to meet the increasing complex requirements in photoelectric countermeasure application field.…”

mentioning

confidence: 99%

Visual Passive Ranging Method Based on Re-entrant Coaxial Optical Path and Experimental Verification

Yang

Liu

Zhu

et al. 2017

Chinese Phys. Lett.

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To overcome the shortcomings of the traditional passive ranging technology based on image, such as poor ranging accuracy, low reliability and complex system, a new visual passive ranging method based on re-entrant coaxial optical path is presented. The target image is obtained using double cameras with coaxial optical path. Since there is imaging optical path difference between the cameras, the images are different. In comparison of the image differences, the target range could be reversed. The principle of the ranging method and the ranging model are described. The relationship among parameters in the ranging process is analyzed quantitatively. Meanwhile, the system composition and technical realization scheme are also presented. Also, the principle of the method is verified by the equivalent experiment. The experimental results show that the design scheme is correct and feasible with good robustness. Generally, the ranging error is less than 10% with good convergence. The optical path is designed in a re-entrant mode to reduce the volume and weight of the system. Through the coaxial design, the visual passive range of the targets with any posture can be obtained in real time. The system can be widely used in electro-optical countermeasure and concealed photoelectric detection.

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Digital laser range finder: phase-shift estimation by undersampling technique

Cited by 17 publications

References 4 publications

A least-square-based approach to improve the accuracy of laser ranging

A least-square-based approach to improve the accuracy of laser ranging

High-resolution rangefinder with a pulsed laser developed by an undersampling method

Visual Passive Ranging Method Based on Re-entrant Coaxial Optical Path and Experimental Verification

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