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Battlefield situational awareness is the core condition that determines the success or failure of the battlefield, and it is also an important application direction of photodetectors. The rapid development of AI technology in rece...
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Battlefield situational awareness is the core condition that determines the success or failure of the battlefield, and it is also an important application direction of photodetectors. The rapid development of AI technology in recent years is about to cause major changes in future wars. The new AI battlefield will also put forward new urgent needs for situational awareness. This article summarizes the current main modes of collaborative detection of battlefield situation awareness and its research status, including radar / infrared composite detection, multi-source data fusion of radar / infrared detection, cooperative target recognition, target tracking, etc. On this basis, combined with the current development trend of the intelligence level of the main battlefield equipment, we get the development needs of future intelligent battlefield situational awareness for new types of collaborative detection, including requirements for its style, angle, speed, and detection targets of distributed collaborative detection. Based on this, the key development directions and core issues to be solved for intelligent battlefield situational awareness in the future are proposed.
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This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combin...
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This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combined large elliptical orbit, then to the development process of the high-track network and the low-track network cooperate with each other. It also summarizes the development process of infrared detectors from single-band to multi-band, from line scan with less detection pixels to line scan with more detection pixels and large-area staring array The application scenarios, overall scheme, and overall parameters of the STSS detection system are sorted out, and the core technical indicators are analyzed for the overall parameters. From the perspective of the development process of the US early warning satellite system and the technical characteristics of the space-based infrared system, US early warning satellite technology is of great significance to research on US defense programs, equipment, and system capabilities.
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In the view of the problem existing in optical system for airborne pods, the type of optical system suitable for the compact space of airborne pods is analyzed, and the combination of the-three-mirror afocal system and the telepho...
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In the view of the problem existing in optical system for airborne pods, the type of optical system suitable for the compact space of airborne pods is analyzed, and the combination of the-three-mirror afocal system and the telephoto system are chosen. In this paper, the method of three-mirror-afocal system design based on primary aberration is explored. The structural parameters are calculated according to primary aberration coefficient. The procedure for calculating initial structural parameters is programmed. Then a three-mirror afocal system is designed with an entrance pupil diameter of 115mm, a field of view of 1.4°× 1 °, compression ratio of 5 times. The principle of telephoto system is introduced, and two relay optical systems are designed. The results indicate that the design values of the average modulation transfer function (MTF) are 0.43 and 0.57 respectively. The average MTF of dual channel systems are 0.37 and 0.55 respectively after the installation and adjustment. The main optical system and relay system in this paper have high imaging quality, and the modular design can be realized by replacing the relay system. The method of dual channel system can be used for multichannel airborne pods.
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摘要 :
This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combin...
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This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combined large elliptical orbit, then to the development process of the high-track network and the low-track network cooperate with each other. It also summarizes the development process of infrared detectors from single-band to multi-band, from line scan with less detection pixels to line scan with more detection pixels and large-area staring array The application scenarios, overall scheme, and overall parameters of the STSS detection system are sorted out, and the core technical indicators are analyzed for the overall parameters. From the perspective of the development process of the US early warning satellite system and the technical characteristics of the space-based infrared system, US early warning satellite technology is of great significance to research on US defense programs, equipment, and system capabilities.
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摘要 :
In the view of the problem existing in optical system for airborne pods, the type of optical system suitable for the compact space of airborne pods is analyzed, and the combination of the-three-mirror afocal system and the telepho...
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In the view of the problem existing in optical system for airborne pods, the type of optical system suitable for the compact space of airborne pods is analyzed, and the combination of the-three-mirror afocal system and the telephoto system are chosen. In this paper, the method of three-mirror-afocal system design based on primary aberration is explored. The structural parameters are calculated according to primary aberration coefficient. The procedure for calculating initial structural parameters is programmed. Then a three-mirror afocal system is designed with an entrance pupil diameter of 115mm, a field of view of 1.4°× 1 °, compression ratio of 5 times. The principle of telephoto system is introduced, and two relay optical systems are designed. The results indicate that the design values of the average modulation transfer function (MTF) are 0.43 and 0.57 respectively. The average MTF of dual channel systems are 0.37 and 0.55 respectively after the installation and adjustment. The main optical system and relay system in this paper have high imaging quality, and the modular design can be realized by replacing the relay system. The method of dual channel system can be used for multichannel airborne pods.
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In this paper, combining with the tenth anniversary load test of Sutong Bridge, we proposed the Brillouin Optical Time Domain Analysis (BOTDA) to conduct health monitoring research on the bridge, and completed the following three ...
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In this paper, combining with the tenth anniversary load test of Sutong Bridge, we proposed the Brillouin Optical Time Domain Analysis (BOTDA) to conduct health monitoring research on the bridge, and completed the following three aspects: Firstly as an auxiliary measure of strain monitoring, monitor the level of stress and strain along the longitudinal bridge to each position. Secondly through the parking of the vehicles at different positions on the bridge pavement, the influence lines on the overall structural stress of the bridge are obtained. Thirdly through the long-term strain monitoring of the bridge, the impact of the usual traffic load information on the bridge strain is obtained.The results show that the technology not only breaks through the monitoring bottleneck of traditional point sensors, but also realizes distributed measurement of strain on the transmission path; it can also be used for real-time monitoring, damage identification, crack location, settlement monitoring of traffic load information of bridges and other structures.. Compared with the traditional sensor test results, the effectiveness and frontier of the technology are proved, and the significance of the distributed fiber-optic sensor technology for the health monitoring of major structures such as bridges is fully explained.
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Aiming at the problems existing in the optical system of laser communication terminal, in order to improve the isolation level of the communication terminal, the off-axis four-mirror afocal system with ultra-long exit pupil distan...
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Aiming at the problems existing in the optical system of laser communication terminal, in order to improve the isolation level of the communication terminal, the off-axis four-mirror afocal system with ultra-long exit pupil distance used in the coude optical path laser communication terminal is studied. In this paper, the method of four-mirror afocal system design based on primary aberration is explored. The structural parameters are calculated according to primary aberration coefficient. The procedure for calculating initial structural parameters is programmed. Then a four-mirror afocal system is designed with an entrance pupil diameter of 100mm, a field of view of 500μrad, the operating wave band of 1.55um, and compression ratio of 15 times. The distance of exit pupil is greater than 500mm. After assembly and adjustment, the wavefront error root mean square (RMS) value of the four-mirror afocal system is 0.0172λ(λ=1.55μm). The four-mirror afocal system in this paper can have good imaging quality, reduce the backreflection and scattering of the sensitive mirrors, and solve the contradiction between the ultra-long exit pupil distance and the ultra-large compression ratio. It has application prospect in the field of space laser communication and space gravitational wave detection.
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In the present study, a new method is proposed for LBO predictions on the basis of former improved Lefebvre's model and numerical simulation. Three main issues are presented: 1. The former improved Lefebvre model is applied in the...
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In the present study, a new method is proposed for LBO predictions on the basis of former improved Lefebvre's model and numerical simulation. Three main issues are presented: 1. The former improved Lefebvre model is applied in the practical flame region instead of entire combustor. The global combustor parameters that contained in original Lefebvre's model are replaced by the localized parameters. 2. The practical flame region near LBO is characterized by OH concentration in simulated reacting flows. Comparing with the practical flame region captured by high-speed video camera, the flame region obtained by simulation and experiment are basically consistent. 3. By the comparison with the experiment data for different incoming conditions, the LBO fuel/air ratios calculated by the improved Lefebvre model fit satisfactorily with experiment data. The maximum and average uncertainties are ±20% and ±9%, showing that the method is reliable and can be used in practical engineering.
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摘要 :
In the present study, a new method is proposed for LBO predictions on the basis of former improved Lefebvre's model and numerical simulation. Three main issues are presented: 1. The former improved Lefebvre model is applied in the...
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In the present study, a new method is proposed for LBO predictions on the basis of former improved Lefebvre's model and numerical simulation. Three main issues are presented: 1. The former improved Lefebvre model is applied in the practical flame region instead of entire combustor. The global combustor parameters that contained in original Lefebvre's model are replaced by the localized parameters. 2. The practical flame region near LBO is characterized by OH concentration in simulated reacting flows. Comparing with the practical flame region captured by high-speed video camera, the flame region obtained by simulation and experiment are basically consistent. 3. By the comparison with the experiment data for different incoming conditions, the LBO fuel/air ratios calculated by the improved Lefebvre model fit satisfactorily with experiment data. The maximum and average uncertainties are ±20% and ±9%, showing that the method is reliable and can be used in practical engineering.
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This paper firstly expounds the basic idea of modern logistics, then on the basis of that, it analyzes the present situation of China's enterprises' logistics system, proposing that logistics process reengineering should be guided...
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This paper firstly expounds the basic idea of modern logistics, then on the basis of that, it analyzes the present situation of China's enterprises' logistics system, proposing that logistics process reengineering should be guided by the principle of BPR. Finally it provides the basic procedures of logistics system reengineering for reference.
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