Contents
2020
Volume: 41 Issue 8
8 Article(s)
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Research Status and Development Trend of Hyperspectral Imagers Onboard Airborne and Spaceborne Platforms
Yan-yu FU, Guang YANG, and Shi-hao GUAN
Due to the great advantages of high spectral resolution and integrated maps, hyperspectral imaging technology has developed significantly in the past 40 years. The current airborne and spaceborne hyperspectral payload-carrying platforms can cover a wide range of the earth′s surface, which are one of the most significanDue to the great advantages of high spectral resolution and integrated maps, hyperspectral imaging technology has developed significantly in the past 40 years. The current airborne and spaceborne hyperspectral payload-carrying platforms can cover a wide range of the earth′s surface, which are one of the most significant science and technological breakthroughs since the development of remote sensing technology. They have been successfully applied in military fields such as camouflage recognition, weapon production investigation, weapon use detection, offshore monitoring and anti-submarine, and have achieved significant military effects. The development history of hyperspectral imagers at home and abroad is reviewed, and the main characteristics of hyperspectral imagers onboard airborne and spaceborne platforms are summarized and analyzed..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 1 (2020)
Study on the Performance of SW/MW Double-color MCT Detector
Yan-lei XING, Jian-wei LIU, Jing-wei WANG, and Zhong-he LI
The development of double-color detector at home and abroad is introduced. And the performance of the Si-based 320×256 SW/MW double-color infrared detector developed by the unit is reported. Under the test condition of 77 K, the blind element rates of the short wave(SW)and medium wave (MW)bands are 0.88% and 1.47%The development of double-color detector at home and abroad is introduced. And the performance of the Si-based 320×256 SW/MW double-color infrared detector developed by the unit is reported. Under the test condition of 77 K, the blind element rates of the short wave(SW)and medium wave (MW)bands are 0.88% and 1.47% respectively. The average peak detection rate are 2.21×1012 cm·Hz1/2·W -1and 2.13×1011 cm·Hz1/2·W -1 respectively. The back cutoff wavelengths are 3.129 m and 5.285 m respectively. The spectral crosstalk from SW to MW band is 1.38%, the crosstalk from MW to SW band is 2.82%. At the same time, the detector has good imaging results in the dual-band, which provides a foundation for further research on multi-band detectors with larger array and better performance..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 9 (2020)
Study on Back Thinning Technologies of Long-wave InAs/GaSb Type-Ⅱ Superlattice Infrared Detectors
Yu CHENG, Ying-hao BAO, Yu XIAO, Chun-ling LI, Zhe KANG, and Ming LIU
In long-wave infrared region, InAs/GaSb type-Ⅱ superlattice material has more superior performance than HgCdTe, thus has been widely studied. A series of experiments were carried out on the InAs/GaSb type-Ⅱ superlattice infrared detector to improve the technology level of back thinning. For GaSb single wafers, differenIn long-wave infrared region, InAs/GaSb type-Ⅱ superlattice material has more superior performance than HgCdTe, thus has been widely studied. A series of experiments were carried out on the InAs/GaSb type-Ⅱ superlattice infrared detector to improve the technology level of back thinning. For <100> GaSb single wafers, different single-point diamond turning (SPDT), mechanical chemical polishing and chemical polishing methods were studied. The machining damage was removed. Through the experiments of InAs/GaSb type-Ⅱ superlattice infrared devices, good infrared imaging pictures were obtained by the long-wave detector assembly, which can improve the technology level of InAs/GaSb type-Ⅱ superlattice long-wave infrared detector..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 15 (2020)
Research on Bad Pixel Detection Technology of Line Array Infrared Detector
Xiao-long WANG, Zhi-hong GONG, Dong-bing LI, and Xing-sheng ZHANG
The bad pixel is one of the important indexes to measure the photoelectric performance of infrared detectors which is caused by material, technology and some other factors. In this paper, a line-scanning HgCdTe infrared detector is taken as the research object, and the bad pixel types of the detector are analyzed by vaThe bad pixel is one of the important indexes to measure the photoelectric performance of infrared detectors which is caused by material, technology and some other factors. In this paper, a line-scanning HgCdTe infrared detector is taken as the research object, and the bad pixel types of the detector are analyzed by various bad pixel detection methods. The analysis results are taken as the basis for accurately determining the number and location of bad pixels. By replacing the bad pixels, the images with good quality are obtained..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 21 (2020)
A General Technology of Infrared Radiation Characteristics Measurement
Zhi-ping WANG, Tong-bang WU, Zhou LI, and Chun-na LI
The infrared radiation characteristic of the target is one of the important infrared data for stealth performance evaluation and target recognition.The traditional infrared radiation inversion technology categorizes the targets into point targets and surface targets for processing respectively.Considering the influenceThe infrared radiation characteristic of the target is one of the important infrared data for stealth performance evaluation and target recognition.The traditional infrared radiation inversion technology categorizes the targets into point targets and surface targets for processing respectively.Considering the influence of the flight attitude and range variation of the target, it is difficult to categorize the targets into point targets and surface targets by using the present infrared radiation characteristic data. A general method for measuring infrared radiation characteristics is proposed in this paper, which can unify the processing of target characteristics and simplify the data processing mode. In this paper, the accuracy of target inversion is verified by using this method based on the measuring system of medium wave infrared radiation characteristics of 600 mm caliber. The target data is processed respectively under the conditions of 2000 s and 3000 s integration time, which proves the effectiveness of the proposed algorithm. This method has certain engineering application significance..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 29 (2020)
Influence of Geometric Deformation of Large Laser Gyroscope on Scale Factor
Er-jiang ZHAI, Wen-ge GUO, Li-xun YAO, Li-song ZHANG, Xue-dong XU, Shi-tong LIU, Ming-ming WEI, and Qiu-ye QUAN
The scale factor of large laser gyroscope has a strong dependence on the geometric deformation of the ring cavity. According to the structure and working characteristics of the large laser gyroscope, the key technologies affecting the measurement accuracy are studied, and the geometric deformation of the ring cavity whThe scale factor of large laser gyroscope has a strong dependence on the geometric deformation of the ring cavity. According to the structure and working characteristics of the large laser gyroscope, the key technologies affecting the measurement accuracy are studied, and the geometric deformation of the ring cavity which affects the scaling factor is calculated and analyzed. The variation of the scaling factor after the geometric deformation of the ring cavity is obtained. In addition, the optimization method of the scale factor of the ring cavity is presented, and the variation of temperature and stress on the scale factor is given. It is concluded that when the production conditions, working environments and cavity structures are same, the compensation of scale factor is beneficial to the improvement of measuring accuracy of large laser gyroscope..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 36 (2020)
Application of Artificial Intelligence and Knowledge Graph Algorithm in UAV Intelligent Attack
Wen-jun SHI, and Wan-suo LIU
Under the condition of information warfare, a variety of reconnaissance and surveillance equipments(such as satellite, radar, UAV group, etc)can acquire massive battlefield information and data. How to effectively utilize the massive multiple source isomerism information to improve the intelligence degree and strike prUnder the condition of information warfare, a variety of reconnaissance and surveillance equipments(such as satellite, radar, UAV group, etc)can acquire massive battlefield information and data. How to effectively utilize the massive multiple source isomerism information to improve the intelligence degree and strike precision of UAV is a hot research field. Based on the introduction of the development status of knowledge graph and artificial intelligence, the knowledge graph is constructed aiming at the goal of guiding UAV to complete intelligent strike, and a solution is given combining with specific war requirements and scene characteristics..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 41, Issue 8, 44 (2020)
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