中国开放科研知识云: 检索

Design of parallel wave-front restoration algorithm based on FPGA 期刊论文
OPTIK, 2019, 卷号: 176, 页码: 168-174
作者: Yang, Xiaoxia; Lin, Xudong; Wang, Liang; Zhao, Jinyu; Wang, Jianli

收藏 | 浏览/下载：49/0 | 提交时间：2019/08/21

Parallel wave-front restoration algorithm Adaptive optical system Wave-front processor Close-loop control FPGA

Simulation test system of CCD signal processor based on FPGA (EI CONFERENCE) 会议论文
2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan
Zhang D.; Liu D.-B.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

Simulation test system of CCD signal processor based on FPGA is proposed. Field-programmable gate array (FPGA) is applied as control processing core and used in the aerospace upgrade screening of industrial grade signal processor. The system functional composition and working principle were introduced in detail. Actually evaluation and testing system was completed with integrating the forty signal processor in a single board. The system has been successfully applied in the dynamic build-in screening test of industrial grade signal processor XRD98L63 the system work stably and reliability. Test result is zero on the nonconforming product rate satisfying the qualification that single batch screening nonconforming rate is less than 5% build-in screening of industrial grade components for the space load applications is implemented. (2013) Trans Tech Publications Switzerland.

Design of high speed and parallel compression system used in the big area CCD of high frame frequency (EI CONFERENCE) 会议论文
2011 International Conference on Precision Engineering and Non-Traditional Machining, PENTM 2011, December 9, 2011 - December 11, 2011, Xi'an, China
Liu Y.-Y.; Gao Y.-H.; Li G.-N.; Wang W.-H.; Zhang R.-F.; Jin L.-X.

收藏 | 浏览/下载：47/0 | 提交时间：2013/03/25

According to the area CCD camera of characteristics such as high resolution capacity and high frame frequency this paper puts forward a high speed and parallel image compression system of high integration degree. Firstly according to the work principle of the area CCD FPGA is adopted to realize the timing driving and multichannel and parallel analog signal handling to raise the export frame frequency of the area CCD. Secondly with an image compression scheme based on FPGA embedded processor MicroBlaze and ADV212 compression chip real time image compression and the high speed area CCD are realized. Finally by detecting the analog signal of the area CCD output the real time compression of the big area CCD image is carried out in different compression ratios and the compression performance is analyzed. Experiment result shows that this scheme can realize real time image compression with the biggest data rate of 520Mbps. When compression bit ratio is 0.15 the signal-to-noise ratio of peak value can reach 36 dB. Image collection and image compression are integrated which reduces the data transmission between them and improves systematic integration degree.

A comparison of hardware implementation of BP neural network based on NIOS II single-core and multi-core processor (EI CONFERENCE) 会议论文
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Zhang W.; Dai M.; Zhang H.

收藏 | 浏览/下载：12/0 | 提交时间：2013/03/25

The hardware implementation of neural network at present is introduced in this paper. And then implementations of neural network based on NIOS II single-core and multi-core processor are compared. At last the results of two methods are given taking BP network fitting sine curve for example. 2011 IEEE.

Design of motion adjusting system for space camera based on ultrasonic motor (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Xu K.; Jin G.; Gu S.; Yan Y.; Sun Z.

收藏 | 浏览/下载：71/0 | 提交时间：2013/03/25

Drift angle is a transverse intersection angle of vector of image motion of the space camera. Adjusting the angle could reduce the influence on image quality. Ultrasonic motor (USM) is a new type of actuator using ultrasonic wave stimulated by piezoelectric ceramics. They have many advantages in comparison with conventional electromagnetic motors. In this paper some improvement was designed for control system of drift adjusting mechanism. Based on ultrasonic motor T-60 was designed the drift adjusting system which is composed of the drift adjusting mechanical frame the ultrasonic motor the driver of Ultrasonic Motor the photoelectric encoder and the drift adjusting controller. The TMS320F28335 DSP was adopted as the calculation and control processor photoelectric encoder was used as sensor of position closed loop system and the voltage driving circuit designed as generator of ultrasonic wave. It was built the mathematic model of drive circuit of the ultrasonic motor T-60 using matlab modules. In order to verify the validity of the drift adjusting system was introduced the source of the disturbance and made simulation analysis. It designed the control systems of motor drive for drift adjusting system with the improved PID control. The drift angle adjusting system has such advantages as the small space simple configuration high position control precision fine repeatability self locking property and low powers. It showed that the system could accomplish the mission of drift angle adjusting excellent. 2011 SPIE.

Evaluation of the operating range for ground-based infrared imaging tracking system (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
Zhang B.; Zhang Z.-D.; Zhang S.-M.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

Ground-based infrared imaging tracking system (GIITS) is of great importance for aerial target warning and guard. The operating range is one of the key performance specifications on the other which should be calculated calculate the radiation power received on the detector in order to analysis whether the output signal meets the detection requirements or not analyzed and studied during the whole GIITS design process. The operating range is mostly influenced by a few factors without considering the effect of the background radiation. By improving of the traditional method including atmospheric attenuation a new operating range calculation model of the GIITS was established based on two requirements. One is that the image size of observed target should meet the requirement of the processor signal extraction. The number of the pixel occupied by target image should be more than 9. The other is that the signal noise ratio (SNR) of the GIITS should not be less than 5 to meet the requirements of the target detection probability and spatial frequency. The SNR calculation equation in form of energy is deduced and the radiation characteristic of the observed target and background are analyzed. When evaluate the operating range of the GIITS using the new method the performance of GIITS and feature of target and background. This paper firstly makes analysis and summarization on the definite localizations of the traditional operating range equation of the GIITS. The localizations are mainly in two aspects. On one hand we should successively calculate two operating range values according to two requirements mentioned above and choose the minimum value as the analytic result. In the end the dispersion of the image and the effect of image dispersion are not considered in the traditional method an evaluation of operating range for fighter aircraft is accomplished as an example. The influence factors in every aspect on operating range were explored by the calculated result. The new operating range calculation model provides the theoretical basis for the design and applications as well as the comprehensive evaluation of a GIITS. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

A brushless DC motor controller with current-loop control (EI CONFERENCE) 会议论文
2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, September 16, 2011 - September 18, 2011, Yichang, China
Gao S.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

This paper presents a brushless DC motor controller with current loop control. The controller applies a complementary PWM modulation scheme to the power MOSFET. The current processor employed by the controller could detect the current flow through the motor windings accurately and convert the current to a voltage input to the error amplifier. The controller has 100% duty cycle high side conduction capability and real four quadrant torque control capability. It is able to implement a tight torque control for a DC brushless motor to satisfy the need of some servo system which calls for high bandwidth and raid dynamic response. 2011 IEEE.

808nm high-power semiconductor laser therapeutic apparatus based on LPC2138 (EI CONFERENCE) 会议论文
2011 IEEE International conference on Intelligent Computation and Bio-Medical Instrumentation, ICBMI 2011, December 14, 2011 - December 17, 2011, Wuhan, Hubei, China
Wang B.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

In this paper we designed an intelligent 808nm high-power semiconductor laser therapeutic apparatus with the LPC2138 ARM processor. The laser is driven by the digital constant current source module and the apparatus has good human-machine interaction performance on account of set the parameters intelligently. The function such as operation mode output power output pulse width and pulse cycle could be easily set through the TFT touch screen. The application software could transmission the log data to the computer by the USB interface in order to check and study the records later. 2011 IEEE.

A small thickness measurement system based on PSD and FPGA (EI CONFERENCE) 会议论文
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
Guo J.; He X.; Wei Z.; Wu Y.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

Considering that the requirement of industrial manufacture An AT89S51 singlechip works as the core processor of the system. By two laser triangulation a small thickness measurement system based on PSD and FPGA is presented. It takes S3931 PSD of one dimension as position detection device A FPGA produces logic control signals for the whole system the small displacement is converted to differential voltages which is made by Hamamatsu in Japan and after amplification and A/D transformation 8-bit parallel data is send to singlechip from FPGA by external interrupts and the final calculation results output to the LCD display module. After digital micro meter calibration we get the small thickness. Experiments show that the detection accuracy of the system is not less than 10um.

Study on image real-time interpretation based on particle filter (EI CONFERENCE) 会议论文
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
Wang Z.-Q.; Liu S.-J.; Geng T.-W.; Shen C.-W.; Yu S.-B.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

In order to satisfy to the real-time requirement of image interpretation system in photoelectric measurement equipments a kind of hardware acceleration system with MIMD distributed multi-processor architecture based on SOPC technology is designed. The particle filter algorithm is proposed to process image interpretation for state estimation problem of nonlinear and non-Gaussian system. This algorithm does not involve conventional linearization transform and has approximated the posterior probability density by a set of discrete particles. Therefore the approximate optimum result is educed. It has a high accuracy and a rapid convergence. Experimental results show that the algorithm be adequate to real time accuracy and robustness meets the requirement of image interpretation and possesses practical significance for engineering applications. 2011 IEEE.

在结果中检索

相关链接

CORC

联系我们