To solve the contradiction between miniaturization of photoelectric encoders and high-precision measurement, a matrix coding and decoding method based on 16 quadrants is proposed in this paper. 21-bit matrix coding can be realized by engraving two circles of matrix code tracks, compared with traditional optoelectronic encoders, this encoder achieves higher accuracy with fewer code circles. In this paper, the design of a new-type matrix code disk, the design of coding and decoding methods and simulation analysis are mainly carried out. Theoretical calculation and simulation analysis show that the encoder designed is feasible, and this paper proposes a new method for the miniaturization and high-precision measurement of encoder.
Target segmentation is an important aspect in autonomous driving systems. In this paper, we propose an improved algorithm based on the Euclidean clustering algorithm for the segmentation of LiDAR pedestrian point clouds, which often results in under-segmentation due to the close distance. After the point cloud pre-processing, the target segmentation is performed based on the point cloud density and spacing as the clustering basis. The experimental results show that the improved algorithm improves the target segmentation accuracy by about 4% and the pedestrian target segmentation accuracy by about 6.4% for the traditional Euclidean clustering algorithm.
The target detection by fusion of LIDAR and camera can effectively improve the accuracy of target detection and recognition. The current fusion algorithm mainly stays in feature-level fusion, and the real-time performance is poor to be deployed in mobile, this paper proposes a target-level fusion scheme to fuse the target frames detected by two sensors based on the overlap, and the experiments show that the method can effectively improve the detection rate and classification correct rate.
Encoders have the advantages of high precision and reliability, and are widely used in industries such as industry and aviation and military industries. As Industry 4.0 puts forward higher requirements for encoder output accuracy, this paper proposes a subdivision error compensation model of particle swarm network based on adaptive subdivision. Through the parallel iterative particle swarm optimization model, the error compensation of the encoder output grating signal is realized. The problems in the past particle swarm optimization models, such as slow convergence speed and easy to fall into local optimum, are optimized. The optimization algorithm can effectively improve the convergence speed and system accuracy of traditional particle swarm optimization.
As a precision position sensor, the photoelectric encoder has difficulty avoiding eccentricity or tilt error in the industrial manufacturing and assembly process. At present, manual error correction is often used to adjust. The adjustment efficiency is low, and it has difficulty cooperating with other types of error compensation methods. In view of these problems, we proposed a photoelectric encoder eccentricity error detection and compensation method based on digital signal bandpass filtering that effectively corrects the signal deviation caused by the installation eccentricity in the output signal and judges the direction and magnitude of the eccentricity error to realize the encoding correction of eccentricity and inclination error of the device. The mathematical model of the eccentric error generation principle of the photoelectric encoder combined with the Lissajous figure was derived. We then demonstrated the design of a photoelectric encoder error detection platform to detect photoelectric encoders of different diameters in real time. Finally, using the advantages of field programmable gate array high-speed parallel processing, the error compensation algorithm was written into the development chip to improve the efficiency of processing the encoder output error signal. This method can adapt to the eccentricity error correction and compensation of different models of photoelectric encoders and can greatly improve the efficiency and accuracy compared with previous detection methods.
KEYWORDS: System on a chip, Filtering (signal processing), Error analysis, Digital signal processing, Computing systems, Sensors, Resistance, Control systems, Systems modeling, Signal processing
In order to improve the accuracy of the estimated value of battery state of charge, this paper builds an electric vehicle battery management system platform, and proposes an extended EKF algorithm based on THEVENIN battery model, and a detailed analysis and introduction of the BMS software and hardware structure, at the same time in order to facilitate debugging, designs the input and output system and the host computer data receiving system, carries out the simulated working condition test of the lithium iron phosphate battery pack through MATLAB/SINULINK simulation, and gets the result that error of the estimated battery state of charge (SOC) is within 5%, confirms the reliability of BMS test platform and software system, accuracy of battery model and estimation algorithm.
A high-precision error measurement method of angular displacements based on the biaxial of the reciprocal roll angles (RRA) is presented. The resolution and precision of the angular displacement measurement systems are guaranteed using the principle of small-angle measurements, along with a photoelectric autocollimator and reflector. Based on the method of the biaxial RRA and the principle of full-circle closure, a displacement measurement system covering the full circumferential range is built. The displacement measurement system can recognize the reference angle error elimination, the calibration angle error, and mutual compensation. The total error model of the angular displacement error measurement and the biaxial turntable is established, and the main error terms are analyzed using the total error model of the turntable and the components. The traditional “Fourier harmonic analysis” and sparse decomposition methods are used to correct the system error components. The simulation accuracy of the corrected turntable is similar to that of the error-free term, and the analysis results are used in the system-optimized configuration, including precision distribution. The experiment verifies the feasibility and effectiveness of the proposed high precision, angular displacement, and error measurement method.
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