Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System

Yu, Jirong; Wang, Qiang; Zhou, Guomei; He, Dong; Xia, Yunxia; Liu, Xiang; Lv, Wenyi; Huang, Yongmei

doi:10.3390/s18092998

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Therefore, it is necessary to introduce filtering algorithm to eliminate these interferences. At present, the commonly used denoising method are band-pass filters and mean filters [19][20][21][22][23][24][25][26]. However, as general filters, band-pass filter and mean filter do not consider the prior information that the grating encoder signal is sinusoidal, and thus do not achieve the best filtering result.…”

Section: Introductionmentioning

confidence: 99%

Instantaneous grating signal subdivision system with non-linear Kalman filters

Wang

Shi

Li³

et al. 2022

Optical Design and Testing XII

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Grating encoder is a sinusoidal encoder based on grating diffraction principle, which is currently utilized in many high-precision displacement systems because of its advantageous characteristics: low cost, simple structure, works in harsh environments, high reliability, and so on. The output signal of grating encoder usually contains noise interference error, amplitude inconsistency error, DC bias error, harmonic error and quadrature phase error. These non-ideal factors are the main reasons for affecting the precision of subdivision. In the traditional signal subdivision system, it is usually necessary to compensate each kind of error separately, which will consume many hardware and computing resources and cause a significant output latency, especially in the filtering section and normalization section. In this paper, a non-linear Kalman filter-based sin-cos wave subdivision method is proposed. Compared with the traditional filtering methods, non-linear Kalman filter has higher dynamic response and can provide instantaneous phasor estimation. In addition, it can simultaneously achieve filtering, amplitude normalization, decoupling DC bias, harmonic suppression, and phase compensation functions, which significantly reduces the computational burden and facilitates the implementation on low-cost processors. In this study, a non-linear Kalman filter-based signal segmentation system is implemented on an FPGA platform and verified on a six-degree-of-freedom grating ruler platform. The results show that the single-channel output delay is only 1.8us at a 50MHz clock, which has a very high real-time ability. When the frequency and amplitude of the input signal varies, the non-linear Kalman filter can track instantaneously and has high dynamic characteristics. Experimental results show the effectiveness of this method.

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Section: Introductionmentioning

confidence: 99%

Instantaneous grating signal subdivision system with non-linear Kalman filters

Wang

Shi

Li³

et al. 2022

Optical Design and Testing XII

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“…Guanbin Gao et al [15] studied the mounting eccentric error of the circular grating angle sensors and proposed a compensation method to compensate the error of the joints of an articulated arm coordinate measuring machine. For self-errors of the angle measuring sensor, such as sub-divisional error, Jiawei Yu et al [16] established mathematical models for different types of sub-division errors of photoelectric angle encoders. They also proposed an algorithm compensation method based on the established models to improve the tracking precision of a telescope control system.…”

Section: Introductionmentioning

confidence: 99%

Calibration, Compensation and Accuracy Analysis of Circular Grating Used in Single Gimbal Control Moment Gyroscope

Dai

Chen

et al. 2020

Sensors

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The accuracy of the circular grating is the key point for control precision of the single gimbal control moment gyroscope servo system used in civilian micro-agile satellites. Instead of using the multi reading heads to eliminate eccentricity errors, an algorithm compensation method based on a calibration experiment using a single reading head was proposed to realize a low-cost and high accuracy angular position measurement. Moreover, the traditional hardware compensation method using double reading heads was also developed for comparison. Firstly, the single gimbal control moment gyroscope system of satellites was introduced. Then, the errors caused by the installation of the reading head were studied and the mathematic models of these errors were developed. In order to construct the compensation function, a calibration experiment using the autocollimator and 24-sided prism was performed. Comparison of angle error compensation using the algorithm and hardware method was presented, and results showed that the algorithm compensation method proposed by this paper achieved the same accuracy level as the hardware method. Finally, the proposed method was further verified through a control system simulation.

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“…Motor drives play a key role in modern industry, where the operation of an internal closedcircuit system is largely determined by the optional feedback sensor [6]. Incremental optical encoders are often found in computer numerical control machines, printers, papermaking, food and beverage automation, and problem assessment of rotating machines, where it is mainly used to obtain feedback speed loops [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Investigations of dynamic phenomena of precision length measurement system

Svilainis

Kavaliauskas

Kilikevičius

et al. 2020

The Archives of Automotive Engineering – Archiwum Motoryzacji

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The development of the automotive industry is conditioned by the application of production technologies, which directly depend on production volumes. Today's development of car production is possible only in conjunction with the volume of production, ensuring both the parameters of assembly and production quality. Their constant monitoring is related to the application of the verification tools and technologies used. Such is the length measurement process that needs to be precise in the automotive industry.The paper analyzes the precision length measurement system and its dynamic characteristics. The research is applied to solve the problems of dynamic processes of a precision length measuring system, and the obtained results can be used in the development of precision systems for other purposes. The obtained results describe the vibrations of the length measuring system housing and the measuring head, which show the weak points of the system at the respective frequencies. The paper analyzes the precision length measurement system and its dynamic characteristics. The obtained results describe the vibrations of the length measuring system housing and the measuring head, which show the weak points of the system at the respective frequencies.

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Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System

Cited by 5 publications

References 12 publications

Instantaneous grating signal subdivision system with non-linear Kalman filters

Instantaneous grating signal subdivision system with non-linear Kalman filters

Calibration, Compensation and Accuracy Analysis of Circular Grating Used in Single Gimbal Control Moment Gyroscope

Investigations of dynamic phenomena of precision length measurement system

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