Wang S.,Luoyang Institute of Electro optical Equipment |
Wu M.,Luoyang Optoelectronic Technology Development Center |
Xie Y.,Luoyang Institute of Electro optical Equipment |
Xie Y.,Science and Technology on Electro optic Control Laboratory
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014
To overcome the difficulty in segmenting moving objects from a video sequence taken by a freely moving camera, we propose a new segmentation cue based on a joint spatial-color representation for the foreground and background appearances. Given the segmentation result in the previous frame, two sample sets can be extracted for foreground and background, respectively. We transform the spatial locations of the samples in the two sets towards the current frame, then use these transformed samples to evaluate the foreground and background likelihood maps, and combine these maps to form a likelihood ratio map which is further exploited as a segmentation cue and integrated into a conditional random field energy function. The total conditional random field energy is minimized by the graph cut, leading to a binary mask of moving objects for each video frame. We validate the proposed segmentation cue using several video sequences taken by hand-held cameras in outdoor urban scenes and the results show the effiency of the segmentation cue.
Fan H.,Luoyang Optoelectronic Technology Development Center |
Yang J.,Northwestern Polytechnical University |
Zhu X.,Northwestern Polytechnical University
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2013
The phased array radar seeker is at present the top choice in the new generation air to air missiles guidance system, and beam stabilization is the first problem to be solved in this application. This paper proposes a beam stabilization algorithm for phased array radar seeker based on the theory of the invariability of beam orientation in inertial space. It simulates and analyzes the main factors that affect the isolation performance of a phased array radar seeker. The simulation results indicate that this algorithm possesses good performance and high engineering feasibilty. They also demonstrate that decreasing the cycle of the rate gyroscope's data and the beam control period as well as introducing a transmission delay compensation algorithm of the gyroscope will significantly improve the isolation performance of the seeker.
Zhao Y.,Luoyang Optoelectronic Technology Development Center |
Gao J.,Luoyang Optoelectronic Technology Development Center |
Wang Y.,Luoyang Optoelectronic Technology Development Center |
Quan Y.,Xidian University
Proceedings of 2012 5th Global Symposium on Millimeter-Waves, GSMM 2012 | Year: 2012
A method of Doppler frequency rate estimation is proposed to deal with motion compensations for missile-borne SAR imaging. Working in burst SAR mode, Map Drift method is improved to satisfy the complicated condition of missile-borne motion, such as PRF up to ten kHz and maneuvering speed up to 3 Ma. Appropriate block size of azimuth data sequence and correlative operation should be chosen according to performance analysis, which is shown in this paper. Experimentations proved the validity of this method. © 2012 IEEE.
Cao C.,Luoyang Optoelectronic Technology Development Center |
Xiang J.,Luoyang Optoelectronic Technology Development Center |
Zhang X.,Luoyang Optoelectronic Technology Development Center |
Wang W.,Luoyang Optoelectronic Technology Development Center
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013
The infrared (IR) imaging missile's dome will be heated when fly at high speed in the atmosphere because of the friction of the air flow blocking. The detector's performance will be decline if the dome surface is heated to a certain temperature. In this paper, we find a right way to evaluate the aerothermal effects in the imaging and information processing algorithm. Which have three steps including the aerothermal radiation calculation, quantization and image reconstruction. Firstly, the aerothermal radiation is calculated by using a combination of both methods of theoretical analysis and experiment data. Secondly, the relationship between aerothermal radiation and IR images background mean gray and noise can be calculated through the analysis of the experiment data. At last, we can rebuild an aerodynamic heating effect of infrared images fusion with target and decoy, which can be used for virtual prototyping platform missile trajectory simulation. It can be found that the above constructed images have good agreements with the actual image according to comparison between the simulation data and experiment data. It is an economic method that can solve the lab aerodynamic heating simulation and modeling problems. © 2013 Copyright SPIE.
Zhang L.,Luoyang Optoelectronic Technology Development Center |
Chen H.,Luoyang Optoelectronic Technology Development Center
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011
Dual-band IR imaging detector can be responsive to two correlated spectrum of the target and the flare. With the equivalent temperature of the target and the flare, the radiation characteristic of the target and the flare is simulated by MATLAB which is based on Plank's law of the blackbody radiation, and the SWIR/MWIR spectrum is chose where the IR radiation is the largest difference between the target and the flare. The theoretical calculation procedure is designed according to the transform flow of the IR radiation. First we calculate the responsive results of InSb IRFPA to the cavity blackbody and the extended area blackbody, because of the simulated results are consistent with the tested results, the simulation procedure is of practical. Then consideration of the HgCdTe 128×128 detector with pixels are stacked, the performance parameters of HgCdTe SW/MW dual-band IR imaging detector are simulated with MATLAB procedures, the purpose of distinguish the target from the flare with image and dual-band ratio can be reached, and the two benefit conclusions can be achieved. © 2011 SPIE.
Zhang K.,Luoyang Optoelectronic Technology Development Center |
Rao D.,Luoyang Optoelectronic Technology Development Center |
Lun T.,Luoyang Optoelectronic Technology Development Center |
Duan L.,Luoyang Optoelectronic Technology Development Center
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2016
For friction, moment disturbances and parameters variations in missile servo control system, an adaptive controller with dynamic parameters estimated, nonlinear factors and disturbances compensated online was proposed. Used a dual-observers structure to estimate the immeasurable internal friction state and designed real-time update laws for dynamic parameters based on Lyapunov stability theory. The closed loop control system was proved to be globally uniform asymptotically stable. The simulation results showed that the designed adaptive control algorithm improved tracking performance and had good robustness and stability to disturbances and parameters variations. © 2016 IEEE.
Sun W.,Luoyang Optoelectronic Technology Development Center |
Li M.,Luoyang Optoelectronic Technology Development Center |
Chen H.,Luoyang Optoelectronic Technology Development Center
Optical Engineering | Year: 2014
A dual band multi-element infrared (IR) detector which enables effective target tracking in a complex tactical environment is presented. The photosensitive elements are designed like the stripes of the Lovell optical reticle and arranged close to each other. The thin films of the dual band filter are precisely coated onto an IR transparent substrate, which is then bonded directly onto the surface of photosensitive area with an IR transparent adhesive. The optical system of the detector adopts a spin-scan mode. The filter-detector combination rotates with a mechanical rotor during scanning. The dual band filters temporally encode target location into the incoming radiation signals, and the photosensitive elements then convert the modulated radiation into an electrical signal. The ratio of radiation intensity from two bands can be calculated to distinguish target from IR targetflare mixed signals. Because the pattern of the detector is similar to the Lovell reticle, the detector can also perform spatial filtering to eliminate background noise. In addition, relatively high stability, together with simplicity of the hardware and low cost, indicates that the presented method has a potential application at the field in which precision is not strictly requested. © 2014 Society of Photo-Optical Instrumentation Engineers.
Feng Z.K.,Luoyang Optoelectronic Technology Development Center |
Wei R.D.,Luoyang Optoelectronic Technology Development Center |
Bo Z.J.,Luoyang Optoelectronic Technology Development Center |
Hua D.L.,Luoyang Optoelectronic Technology Development Center
Proceedings of the 2015 27th Chinese Control and Decision Conference, CCDC 2015 | Year: 2015
To restrain the influences of the nonlinearities and uncertainties in missile servo control systems, the active disturbance rejection control (ADRC) technique is introduced to real-time online estimate and compensate these factors. As to the problem of the difficulties in tuning ADRC parameters, an improved multi-objective genetic algorithm is adopted to solve the complete set of Pareto solutions for the control parameters, then a multi-criteria decision making algorithm based on utility function is chosen to determine the fittest solution. Then a test platform using TMS320C28346 floating-point DSP as control core is built to verify the research results. The experimental results show that the optimal ADRC parameter is appropriate for the servo control system. The system tracks the input commands smoothly and reliably, and has good robustness and adaptability to nonlinearities and parameters drifts. Also the strategy for tuning the ADRC parameters is practical and feasible. © 2015 IEEE.
Mo L.,Luoyang Optoelectronic Technology Development Center |
Weiguo S.,Luoyang Optoelectronic Technology Development Center |
Hongxu C.,Luoyang Optoelectronic Technology Development Center |
Junjie S.,Luoyang Optoelectronic Technology Development Center
Applied Optics | Year: 2013
An infrared (IR) dual band multi-element detector with the abilities of dual band IR counter- countermeasure (IRCCM) and spatial filtering is presented for effective target detection in a complex tactical environment. The detection elements of the detector are specially arranged like a conventional reticle pattern. With special design, the ratio of radiation intensity from two IR bands can be calculated to distinguish the target from the IR target-flare mixed signal and the two detection bands use a common aperture in the seeker.Without a reticle in the optical system of the IR seeker, the dual band detector can still perform spatial filtering to eliminate background noise effectively. The design details of the detector are presented. The performance of the detector's dual band IRCCM and spatial filtering are analyzed. Simulation results are presented verifying validity of the presented method. © 2013 Optical Society of America.
Wei X.,Luoyang Optoelectronic Technology Development Center |
Wu C.,Luoyang Optoelectronic Technology Development Center |
Yao C.,Luoyang Optoelectronic Technology Development Center
26th Chinese Control and Decision Conference, CCDC 2014 | Year: 2014
This paper proposes a novel blind multi-target beam-forming algorithm to perform a multi-target beam-former for guidance data link system. The proposed algorithm exploits the knowledge of the pseudo-noise (PN) code used in data-link communication system to generate the transmitted command as reference signal. A novel approach, which a band-pass filter is used, is adopted to improve anti-jamming performance in environment with strong interference. Simulation results demonstrate that our proposal can achieve a superior anti-jamming performance than Multi-target Least Square Constant Modulus Algorithm(MT-LSCMA) in environment with strong jamming. © 2014 IEEE.