Precision-Improved Pulsed Laser Ranging by Multidelayed Echo Signals Triggering

Tao, Min; Peng, Tao; Ding, Changchun; Guan, Jian; Song, Zhixin; Gao, Liangli; Shen, Yu; Li, Xueyan; Gao, Fengli

doi:10.1109/tim.2021.3117632

Cited by 5 publications

(7 citation statements)

References 55 publications

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“…Otherwise, with regard to short-range distance detection, the laser spot is smaller compared with the efficient reflecting surface of the detected target, and the detected target is typically noncooperative and can be assumed as a Lambertian target. In this case, the radar cross-section of detected target σ can be described as Equation (5). Accordingly, the photodetector detectable power P r is expressed by Equation ( 6) [36,37].…”

Section: Numerical Calculationmentioning

confidence: 99%

“…Nowadays, the rapid developments in autonomous driving, unmanned aerial vehicles, robotics, and automotive industries have put forward higher requirements for 3-D imaging obstacle avoidance systems [ 4 ]. For this purpose, using laser ranging techniques to obtain target distances in different azimuths by controlling the scanning angle of the spatial beam is a tried-and-true solution [ 5 ]. For example, the Defense Advanced Research Projects Agency (DARPA) of the U.S. launched ‘the Sweeper’, a small laser radar specially designed for autonomous driving.…”

Section: Introductionmentioning

confidence: 99%

“…The working principles of the laser rangefinder can be divided into time measuring and phase measuring. The type of existing laser rangefinders can be sorted into triangulation mode, pulsed laser mode, frequency-modulated continuous-wave (FMCW) mode, correlation mode, time-correlated single-photon counting (TCSPC) mode, dual-comb mode, and frequency comb interferometry, among others [ 5 ]. Each laser ranging method has its merits and shortcomings.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Short-Range, High-Accuracy Compact Pulsed Laser Ranging System

Luo

et al. 2022

Sensors

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A short-range, compact, real-time pulsed laser rangefinder is constructed based on pulsed time-of-flight (ToF) method. In order to reduce timing discrimination error and achieve high ranging accuracy, gray-value distance correction and temperature correction are proposed, and are realized with a field programmable gate array (FPGA) in a real-time application. The ranging performances—such as the maximum ranging distance, the range standard deviation, and the ranging accuracy—are theoretically calculated and experimentally studied. By means of these proposed correction methods, the verification experimental results show that the achievable effective ranging distance can be up to 8.08 m with a ranging accuracy of less than ±11 mm. The improved performance shows that the designed laser rangefinder can satisfy on-line ranging applications with high precision, fast ranging speed, small size, and low implementation cost, and thus has potential in the areas of robotics, manufacturing, and autonomous navigation.

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Section: Numerical Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Short-Range, High-Accuracy Compact Pulsed Laser Ranging System

Luo

et al. 2022

Sensors

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“…Within a fixed time window, the echo delay pulses sequentially trigger the laser transmitter to generate a pulse laser, and the counter records the number of echo pulses received within that time window, finally, calculate the actual distance. This method improves the precision of pulse laser ranging from centimeter level to millimeter level [30]. In order to further improve the accuracy of laser ranging, and taking into account the characteristics of the TOF pulse laser ranging method and the advantages of simple system structure, this paper proposes a laser ranging method based on double-threshold echo pulse prediction correction.…”

Section: Introductionmentioning

confidence: 99%

Laser ranging method based on dual-threshold echo pulse prediction and correction

Liu

Tao

et al. 2023

Meas. Sci. Technol.

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In order to improve the accuracy of pulse laser ranging based on time-of-flight (TOF), this paper proposes a laser ranging method based on double threshold echo pulse prediction correction. By using two high-speed comparators with different thresholds to detect the pulse-echo signal, the initial TOF, pulse width, and edge rate can be obtained. These three parameters are combined with statistical functions to accurately predict the peak position of the echo pulse and obtain the corrected TOF. Finally, the accurate measurement distance is calculated. In the aspect of improving ranging accuracy, this method overcomes the shortcoming that the traditional time-of-flight pulse laser rangefinder has large errors in measuring targets with different reflectivity. This method only uses two high-speed comparators and a monostable trigger more than traditional TOF laser ranging systems. Adding these simple circuits can greatly improve the accuracy of laser ranging. The system structure is simple and the cost is low. Experimental results show that this method can achieve accurate distance measurement, and the measurement error is significantly reduced. This method can greatly improve the performance of the TOF laser rangefinder.

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“…TOF measurements are usually performed using the pulse counting method, and the timing error is the primary source of the system error. Tao et al [10] proposed a pulsed laser ranging method based on a multi-echo delay trigger, which transmit the echo signal of the pulsed laser into a delay unit and generate an electric pulse with a fixed delay to trigger the laser transmitter to generate the pulsed laser. Multiple delayed echo signals are triggered within a fixed time window to transmit pulses in turn, then the distance can be calculated according to the several echo pulses received and recorded by a counter.…”

Section: Introductionmentioning

confidence: 99%

A Delay Modulation Method to Improve the Time Resolution for a 32 × 32 Array of MPPC Image Sensor

Huang

2022

IEEE Access

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The array laser detector can achieve three-dimensional (3D) flash imaging via multi-channel parallel ranging, which significantly improves the imaging speed. However, the large number of the array makes it difficult to improve the ranging resolution through circuit evolution and data processing, even the imaging speed will be sacrificed. To overcome the problem, a delay modulation method on the transmitter of the laser is proposed in this study. The method is realized by using a 32×32 Multi-Pixel Photon Counter (MPPC) array and an improved phase-shifted clocks method. We eventually achieve 1024-channel 3D imaging that exceeds the depth resolution of the system. Experimental results show that, the Root Mean Square Error (RMSE) of plane fitting with delay modulation is 2.39-5.03 cm, which has come down to 48.6% than those without delay modulation. Using the delay modulation method, a target with a depth difference of about 4 cm can be clearly distinguished by 3D imaging at a distance of 5 m, even if the minimum resolution of the system is 5 cm. Results also demonstrate that the proposed method can easily and effectively enhance the measurement accuracy of 3D flash imaging.

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Precision-Improved Pulsed Laser Ranging by Multidelayed Echo Signals Triggering

Cited by 5 publications

References 55 publications

The Short-Range, High-Accuracy Compact Pulsed Laser Ranging System

The Short-Range, High-Accuracy Compact Pulsed Laser Ranging System

Laser ranging method based on dual-threshold echo pulse prediction and correction

A Delay Modulation Method to Improve the Time Resolution for a 32 × 32 Array of MPPC Image Sensor

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