Abstract:Opto-electronic countermeasure is an important part of electronic countermeasure. Its position in modern war is becoming higher and higher. First, the opto-electronic countermeasure system is analyzed in both the opposite of opto-electronic reconnaissance and anti-reconnaissance and the opposite of opto-electronic jamming and anti-jamming. Then, the typical opto-electronic equipment and their application in the war are presented. Finally, the development trend of opto-electronic technology and equipment is summarized.

Abstract:Tellurium-based chalcogenide fibers have excellent transmission properties in the spectral range from 2 μm to 16 μm. In recent years, they have been paid much attention as the long-wave infrared transmitting materials. The research history and status of tellurium-based chalcogenide fibers are reviewed. The fabrication approaches for fabricating tellurium-based chalcogenide fibers, such as double crucible, rod-in-tube, multi-material stacked coextrusion and multi-material rod-in-tube coextrusion, and their characteristics are analyzed and summarized. The potential applications and prospects of the fibers are discussed.

Abstract:A Quantum Well Infrared Photodetector Light Emitting Diode (QWIP-LED) is a new infrared up-converter. When combining with a Charge Coupled Device (CCD), it can be used for mid-wave infrared imaging detection. Compared with the conventional infrared imaging devices, QWIP-LEDs have a remarkable advantage of low cost. However, because of the low light extraction efficiency (~2%), their application is limited. To improve the light extraction efficiency of the QWIP-LED, a Photonic Crystal Slab (PCS) is incorporated into the surface of the LED. Then, a Finite Difference Time Domain (FDTD) method is used to calculate the improved light extraction efficiency, so as to optimize the structure parameters of the PCS. The simulation result shows that by using an optimized PCS, the light extraction efficiency of the QWIP-LED can be increased by a factor of 2.32. Finally, the mechanism for the PCS to increase light extraction efficiency is analyzed according to the band theory and equivalent medium theory.

Abstract:A time measurement system for an airborne LIDAR based on constant-fraction discrimination is designed by using FPGA. The principle and characteristics of time discrimination, especially of constant-fraction discrimination are described in detail. The error of the traditional constant-fraction discrimination is estimated and a simple circuit for constant-fraction discrimination is designed. Finally, a preliminary scheme for implementing time measurement for a LIDAR by using a tapped delay line method is given. Some suggestions on the improvement of the time measurement system in accuracy are made.

Abstract:In terms of the mechanism of common single-channel and multi-channel laser measurement methods and the existing difficult real time measurement problem, an idea to use a laser array to measure the jamming efficiency of smoke against infrared radiation is proposed. By using the homogenized shaping technology for infrared laser beams, the real time measurement of the infrared transmittance of infrared imaging is implemented when smoke jamming is used. The random problem in transmittance measurement caused by the changing of smoke in an infrared imaging field of view is solved. By calculating the measurement results of different methods under a typical test condition, the quantitative analysis is made for the improvement of measurement accuracy.

Abstract:Inverse calculation of top-of-atmosphere (TOA) radiation at the pupils of sensors onboard Terra/MODIS, FY-3A/MERSI, COMS/GOCI is carried out by using the method of Shen et al. The data on remote sensing reflectance (Rrs) and suspended particulate matter (SPM) concentration are estimated. They are compared with those derived from Envisat/MERIS. The results show that TOA radiation values obtained from MODIS, MERSI and GOCI sensors have a good linear relationship with that of MERIS. The Rrs values obtained from GOCI and MODIS are consistent with that obtained from MERIS. The Rrs value obtained from MERSI is quite different from that obtained from MERIS, particularly in the near infrared region. The absolute deviations of the SPM inverted by MODIS, MERSI and GOCI from that inverted by MERIS are 36%, 31% and 26% respectively. For the high turbid water around Tangtze Estury, Hangzhou Bay and Jiangsu coast, the SPM values inverted by above three sensors are all close to that inverted by MERIS. For the low turbidity water far from coast, only the data inverted by GOCI perform well.

Abstract:A method for collecting the surface temperature data of a rotary kiln is presented. By taking a TMS320f2407A digital signal processor as an example, the configuration of it, the collection of temperature data and the display of temperature distribution images are described in detail. The method can not only reduce the temperature error caused by high-speed data acquisition effectively, but also solve the problem of image distortion successfully. It has obtained good effectiveness in the practical application.

Abstract:Nowadays, the main methods for obtaining land cover classification information in remote sensing data are still visual interpretation and artificial identification. These methods can obtain more accurate classification results, but their efficiency is too low to meet the increasing application demands. By taking Guangdong province as an example, an automatic land cover classification information extracting and dynamic monitoring method based on remote sensing images is studied. The software for extracting land use classification and dynamic information is developed. Automatic or semi-automatic land use classification is realized. The result can meet the needs of the second national land survey and provide the necessary guidance for land use planning.