Dr. Yanzhong Zhao Profile

Dr. Yanzhong Zhao

at Academy of Equipment Command & Technology

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Author

Publications (14)

Proceedings Article | 30 November 2021 Paper

Performance analysis of free space optical communication based on cat's eye modulating retro-reflector

Laixian Zhang, Huayan Sun, Yanzhong Zhao

Proceedings Volume 12068, 1206805 (2021) https://doi.org/10.1117/12.2606014

KEYWORDS: Eye, Free space optics, Retroreflectors, Modulation, Receivers, Eye models, Modulators, Free space optical communications, Telecommunications, Geometrical optics

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Proceedings Article | 20 December 2019 Paper

Single-source double heterodyne coherent detection high-speed moving target

Jianying Ren, Huayan Sun, Laixian Zhang, Yanzhong Zhao

Proceedings Volume 11209, 112093V (2019) https://doi.org/10.1117/12.2548979

KEYWORDS: Target detection, Sensors, Doppler effect, Heterodyning, Velocity measurements, Signal detection, Laser applications, Signal to noise ratio, Linear filtering, Photodiodes

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Proceedings Article | 18 December 2019 Paper

Research on laser one-dimensional range profile denoising and deconvolution

Jianbiao Chen, Huayan Sun, Yanzhong Zhao, Congmiao Shan

Proceedings Volume 11338, 113380S (2019) https://doi.org/10.1117/12.2542304

KEYWORDS: Deconvolution, Denoising, Wavelets, Pulsed laser operation, Target detection, Convolution, Detection and tracking algorithms, Laser applications, Satellites, Signal to noise ratio

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Proceedings Article | 16 January 2019 Paper

Optical design of CMERR optical system with wide field of view and near the diffraction-limit

Danhua Liang, Huayan Sun, Laixian Zhang, Yanzhong Zhao

Proceedings Volume 10838, 108381R (2019) https://doi.org/10.1117/12.2511414

KEYWORDS: Optical design, Modulation transfer functions, Retroreflectors, Free space optics, Zemax

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Proceedings Article | 9 October 2018 Paper

Simulation and analysis on laser range profiles for complex targets

Jianbiao Chen, Huayan Sun, Yanzhong Zhao

Proceedings Volume 10789, 1078920 (2018) https://doi.org/10.1117/12.2501472

KEYWORDS: 3D modeling, 3D acquisition, OpenGL, Satellites, LIDAR, RGB color model, Target detection, Optical simulations, Scattering, Target recognition

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Proceedings Article | 25 October 2017 Paper

Modeling and analysis of laser active interference optical path

Cong-miao Shan, Hua-yan Sun, Yan-zhong Zhao, Jian-biao Chen, Jian-ying Ren

Proceedings Volume 10464, 104640V (2017) https://doi.org/10.1117/12.2284771

KEYWORDS: Active optics, Laser optics, Michelson interferometers, Interferometers, Geometrical optics, Target detection, Beam splitters, Refraction, Reflection

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Proceedings Article | 24 October 2017 Paper

Laser radar range profile analysis and simulation

Jianbiao Chen, Huayan Sun, Yanzhong Zhao, Congmiao Shan

Proceedings Volume 10462, 104620Y (2017) https://doi.org/10.1117/12.2283005

KEYWORDS: LIDAR, 3D modeling, Speckle, Optical simulations, 3D acquisition, Pulsed laser operation, Surface roughness, Target recognition, Target detection, Laser scattering

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Proceedings Article | 15 October 2015 Paper

Echo scintillation Index affected by cat-eye target's caliber with Cassegrain lens

Cong-miao Shan, Hua-yan Sun, Yan-zhong Zhao, Yong-hui Zheng

Proceedings Volume 9674, 96741R (2015) https://doi.org/10.1117/12.2199661

KEYWORDS: Scintillation, Target detection, Turbulence, Target recognition, Atmospheric turbulence, Laser systems engineering, Active optics, Sensors, Atmospheric modeling, Gaussian beams

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Proceedings Article | 15 October 2015 Paper

Aerodynamic distortion propagation calculation in application of high-speed target detection by laser

Yonghui Zheng, Huayan Sun, Yanzhong Zhao, Jianbiao Chen

Proceedings Volume 9674, 96742C (2015) https://doi.org/10.1117/12.2200977

KEYWORDS: Distortion, Aerodynamics, Radio propagation, Atmospheric propagation, Laser beam propagation, Atmospheric optics, Diffraction, Eye, Target detection, Atmospheric modeling

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Proceedings Article | 6 March 2015 Paper

Analytical beam-width characteristics of distorted cat-eye reflected beam

Yanzhong Zhao, Congmiao Shan, Yonghui Zheng, Laixian Zhang, Huayan Sun

Proceedings Volume 9446, 94462W (2015) https://doi.org/10.1117/12.2181205

KEYWORDS: Monochromatic aberrations, Beam analyzers, Gaussian beams, Sensors, Collimation, Analytical research, Laser beam propagation, Free space optics, Retroreflectors, Distortion

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Proceedings Article | 20 November 2014 Paper

Large incidence angle and defocus influence cat's eye retro-reflector

Lai-xian Zhang, Hua-yan Sun, Yan-zhong Zhao, Ji-guang Yang, Yong-hui Zheng

Proceedings Volume 9300, 93000C (2014) https://doi.org/10.1117/12.2069926

KEYWORDS: Eye, Retroreflectors, Free space optics, Eye models, Receivers, Modulation, Modulators, Geometrical optics, Active optics, Numerical simulations

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Proceedings Article | 21 August 2013 Paper

Effect of the incidence angle to free space optical communication based on cat-eye modulating retro-reflector

Lai-xian Zhang, Hua-yan Sun, Yan-zhong Zhao, Yong-hui Zheng, Cong-miao Shan

Proceedings Volume 8906, 89060K (2013) https://doi.org/10.1117/12.2032477

KEYWORDS: Retroreflectors, Modulation, Free space optical communications, Telecommunications, Modulators, Receivers, Geometrical optics, Error analysis, Sun, Optical simulations

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Proceedings Article | 31 December 2010 Paper

Surface damage effect detection of sensor in optical lens based on cat-eye effect

Yanzhong Zhao, Huayan Sun, Suolin Gu, Pengshan Fan

Proceedings Volume 7544, 75444O (2010) https://doi.org/10.1117/12.885323

KEYWORDS: Sensors, Diffraction, Reflectivity, Mirrors, Retroreflectors, Prisms, Wave propagation, MATLAB, Damage detection, Surface finishing

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Proceedings Article | 5 March 2008 Paper

Implementation and optimization of an improved morphological filtering algorithm for speckle removal based on DSPs

Qitao Liu, Yingchun Li, Huayan Sun, Yanzhong Zhao

Proceedings Volume 6623, 662321 (2008) https://doi.org/10.1117/12.791546

KEYWORDS: Digital signal processing, Speckle, Image filtering, Image processing, Detection and tracking algorithms, Digital filtering, Optimization (mathematics), Wavelets, Imaging systems, Image resolution

Read Abstract +

Laser active imaging system, which is of high resolution, anti-jamming and can be three-dimensional (3-D) imaging, has been used widely. But its imagery is usually affected by speckle noise which makes the grayscale of pixels change violently, hides the subtle details and makes the imaging resolution descend greatly. Removing speckle noise is one of the most difficult problems encountered in this system because of the poor statistical property of speckle. Based on the analysis of the statistical characteristic of speckle and morphological filtering algorithm, in this paper, an improved multistage morphological filtering algorithm is studied and implemented on TMS320C6416 DSP. The algorithm makes the morphological open-close and close-open transformation by using two different linear structure elements respectively, and then takes a weighted average over the above transformational results. The weighted coefficients are decided by the statistical characteristic of speckle. This algorithm is implemented on the TMS320C6416 DSPs after simulation on computer. The procedure of software design is fully presented. The methods are fully illustrated to achieve and optimize the algorithm in the research of the structural characteristic of TMS320C6416 DSP and feature of the algorithm. In order to fully benefit from such devices and increase the performance of the whole system, it is necessary to take a series of steps to optimize the DSP programs. This paper introduces some effective methods, including refining code structure, eliminating memory dependence, optimizing assembly code via linear assembly and so on, for TMS320C6x C language optimization and then offers the results of the application in a real-time implementation. The results of processing to the images blurred by speckle noise shows that the algorithm can not only effectively suppress speckle noise but also preserve the geometrical features of images. The results of the optimized code running on the DSP platform show that the optimized outcome realizes better instruction-level parallelism and pipeline operation and the program is proved to be reliable, effective and high real time.

Showing 5 of 14 publications

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