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Xianyang, China

Gong Y.,Hunan University | Wang M.,Xian Yang Normal College | Gong L.,Xian Technological University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Laser one-dimensional range profile, that is scattering power from pulse laser scattering of target, is a radar imaging technology. The laser two-dimensional range profile is two-dimensional scattering imaging of pulse laser of target. Laser one-dimensional range profile and laser two-dimensional range profile are called laser range profile(LRP). The laser range profile can reflect the characteristics of the target shape and surface material. These techniques were motivated by applications of laser radar to target discrimination in ballistic missile defense. The radar equation of pulse laser is given in this paper. This paper demonstrates the analytical model of laser range profile of cylinder based on the radar equation of the pulse laser. Simulations results of laser one-dimensional range profiles of some cylinders are given. Laser range profiles of cylinder, whose surface material with diffuse lambertian reflectance, is given in this paper. Laser range profiles of different pulse width of cylinder are given in this paper. The influences of geometric parameters, pulse width, attitude on the range profiles are analyzed. © 2015 SPIE. Source

Liu W.,Northwest University, China | Chang Q.-R.,Northwest University, China | Guo M.,Northwest University, China | Xing D.-X.,Northwest University, China | And 2 more authors.
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2011

The hyper-spectral reflectance of soil was measured by a ASD FieldSpec within 400~1000 nm, then treated with logarithmic transformation. First derivative of soil spectra with different scales of differential window were acquired and denoised by the threshold denoising method based on wavelet transform. From the first derivative of soil spectra, feature parameters used as indicators for soil organic matter content were extracted. Results show that: (1) When the number of the scale of differential window was set as W=1~5, it is difficult to identify the spectrum contour and response feature in first derivative of soil spectra because of much noise. (2) When W=6~15, noise in first derivative of soil spectra is partly removed, and spectrum contour is identified roughly. However spectral response feature resulted from different organic content levels can not be identified clearly. (3) When W=16~30, noise in first derivative of soil spectrua is removed effectively. The coefficient of correlation between organic matter content and feature parameter MDs 19 is 0.803. MDs 19 can be used as one of the best indicators for soil organic matter content. Source

Gong Y.,Hunan University | Zhu C.,Hunan University | Wang M.,Xian Yang Normal College | Gong L.,Xian Technological University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

This paper deals with the laser bistatic two-dimensional scattering imaging simulation of lambert cone. Two-dimensional imaging is called as planar imaging. It can reflect the shape of the target and material properties. Two-dimensional imaging has important significance for target recognition. The expression of bistatic laser scattering intensity of lambert cone is obtained based on laser radar eauqtion. The scattering intensity of a micro-element on the target could be obtained. The intensity is related to local angle of incidence, local angle of scattering and the infinitesimal area on the cone. According to the incident direction of laser, scattering direction and normal of infinitesimal area, the local incidence angle and scattering angle can be calculated. Through surface integration and the introduction of the rectangular function, we can get the intensity of imaging unit on the imaging surface, and then get Lambert cone bistatic laser two-dimensional scattering imaging simulation model. We analyze the effect of distinguishability, incident direction,observed direction and target size on the imaging. From the results, we can see that the scattering imaging simulation results of the lambert cone bistatic laser is correct. © 2015 SPIE. Source

Wu P.,Xian University of Technology | Wang M.-J.,Xian University of Technology | Wang M.-J.,Xian Yang Normal College | Ke X.-Z.,Xian University of Technology | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

The development of laser range profile, Doppler spectra and Range Resolved Doppler imaging technologies including the experiments, simulations and engineering applications have been summarized and reviewed in this paper. It was analyzed the problems of the laser radar imaging system which need to solve in experiments and models. The achievements and the key technologies of Range profile, Doppler spectra and Range Doppler imaging laser radar are reported in detail. Different typically theoretical simulated models have been built to show the last technologies of target recognition for laser radar in order to be based on the further studying on designing the laser radar imaging systems in many applications and offering the precise data of the detected target. © 2014 SPIE. Source

Wang M.,Xian Yang Normal College | Meng X.-H.,Xian University of Technology | Li Y.L.,Xian Yang Normal College | Deng R.,Signature | Xiang N.,Xian Yang Normal College
2012 10th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2012 | Year: 2012

The experimental measurement and image processing methods are combined to study the light scattering characteristic from the target, principle of the scaling ratio between the light scattering characteristic and the geometric dimension of the target is presented in this paper. The solar simulator is utilized as a light source which incidence the target with rough surface. The original experimental images must be measured by light receiver and data gathering system. Some image algorithms are be designed to process these experimental data. As a researching example, the imaging light scattering characteristic of two kinds of bigger and smaller simple targets include clubs, cylinders are discussed in detail. The image processed results are shown the scale ratio of the light scattering from target is proportional to its dimensional square. The important of our works is that the scaling rations of the light scattering characteristic can be used to make known the illumination of the whole dimensional detected target, which are useful for further study the complex target such as civilian industries, national defence, air and aero fields. © 2012 IEEE. Source

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