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An angular blinking jamming method based on electronically controlled corner reflectors
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作者 GAN Lin WU Zehao +1 位作者 WANG Xuesong LI Jianbing 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2024年第2期330-338,共9页
Passive jamming is believed to have very good potential in countermeasure community.In this paper,a passive angular blinking jamming method based on electronically controlled corner reflectors is proposed.The amplitud... Passive jamming is believed to have very good potential in countermeasure community.In this paper,a passive angular blinking jamming method based on electronically controlled corner reflectors is proposed.The amplitude of the incident wave can be modulated by switching the corner reflector between the penetration state and the reflection state,and the ensemble of multiple corner reflectors with towing rope can result in complex angle decoying effects.Dependency of the decoying effect on corner reflectors’radar cross section and positions are analyzed and simulated.Results show that the angle measured by a monopulse radar can be significantly interfered by this method while the automatic tracking is employed. 展开更多
关键词 monopulse radar angular blinking jamming corner reflector amplitude-comparison angle measurement metasurface
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Monitoring nonlinear and fast deformation caused byunderground mining exploitation using multi-temporal Sentinel-1 radar interferometry and corner reflectors: application,validation and processing obstacles
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作者 Kamila Pawłuszek-Filipiak Natalia Wielgocka +1 位作者 Damian Tondaś Andrzej Borkowski 《International Journal of Digital Earth》 SCIE EI 2023年第1期251-271,共21页
In this study,Differential Interferometric Synthetic Aperture Radar Interferometry(DInSAR)of artificial Corner Reflectors(CRs)were validated in the area of fast and nonlinear deformation gradient caused by active coal... In this study,Differential Interferometric Synthetic Aperture Radar Interferometry(DInSAR)of artificial Corner Reflectors(CRs)were validated in the area of fast and nonlinear deformation gradient caused by active coal longwall exploitation.Three Sentinel-1 datasets were processed using conventional DInSAR,Persistent Scatterer Interferometry(PSI),and Small BAseline Subset methods implemented in ENVI SARscape™.For evaluation,leveling and Global Navigation Satellite System(GNSS)measurements were used.Considering the challenge of snow cover,the removal of all winter images was not a successful strategy due to the long temporal baseline and strong movement,which cause phase unwrapping problems and underestimate the real deformation.The results indicate that only conventional DInSAR and SBAS with low network redundancy allow us to capture maximal deformation gradient and the root mean square error calculated between the CRs and the ground truth is on the level of 2–3 cm for the vertical and easting deformation component,respectively.For the small deformation gradient represented by the permanent GNSS station(4 cm/year),all SBAS techniques appeared to be more accurate than DInSAR,which corresponds to higher redundancy and better removal of the atmospheric signal.In contrast,DInSAR results allowed to capture information about two subsidence basins,which was not possible with SBAS and PSI approaches. 展开更多
关键词 DINSAR PSI SBAS corner reflectors mining deformations nonlinear and significantdeformation phase unwrapping errors
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Evaluation of PS-DInSAR technology for subsidence monitoring caused by repeated mining in mountainous area 被引量:4
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作者 刘振国 卞正富 +2 位作者 雷少刚 刘东烈 Andrew SOWTER 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3309-3315,共7页
The high resolution Terra SAR-X dataset was employed with DIn SAR and persistent scatterer interferometry(PSI) technique for subsidence monitoring in a mountainous area. For DInS AR technique, the generally used SRT... The high resolution Terra SAR-X dataset was employed with DIn SAR and persistent scatterer interferometry(PSI) technique for subsidence monitoring in a mountainous area. For DInS AR technique, the generally used SRTM and relief-DEM, which was derived from aerial topographic map, were used to evaluate the influence of external DEM. The results show that SRTM could not fully compensate the complex topography of the research area. The corner reflectors installed during the acquisition of SAR dataset were used to estimate the accuracy of geocoding. The terrain corrected geocoding results based on relief-DEM were much better than using SRTM, with the root mean square error(RMSE) being 6.35 m in X direction and 11.65 m in Y direction(both in UTM projection), around one pixel of the multilooked intensity image to be geocoded. For PSI technique, the results from time-series analysis of multi-baseline differential interferograms were integrated to restrict only persistent scatterer candidates near the boundary of subsiding area for regression analysis. The results demonstrate that PSI can refine the boundary of subsidence, which could then be used to derive some angular parameters to help people to learn the law of subsidence caused by repeated excavation in this area. 展开更多
关键词 DIn SAR GEOCODING persistent scatterer interferometry(PSI) repeated excavation corner reflector subsidence monitoring
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Monitoring on subsidence due to repeated excavation with DInSAR technology 被引量:8
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作者 Liu Zhenguo Bian Zhengfu +1 位作者 Lü Fuxiang Dong Baoquan 《International Journal of Mining Science and Technology》 SCIE EI 2013年第2期185-190,共6页
DInSAR technology was used to monitor subsidence caused by underground coal mining activities in mountainous area, with multi source SAR data, including 8 EnviSAT C-band and 4 ALOS L-band, and 4 programmed TerraSAR-X ... DInSAR technology was used to monitor subsidence caused by underground coal mining activities in mountainous area, with multi source SAR data, including 8 EnviSAT C-band and 4 ALOS L-band, and 4 programmed TerraSAR-X dataset. The results revealed that 2-pass DInSAR technique sometimes failed to retrieve the mining-caused subsidence due to spatial and/or temporal de-correlation. We also noticed that there existed residual topographic phase after the compensation with SRTM DEM, which could almost overwhelm the subsidence information when the perpendicular baseline was relatively large. Based on the mining materials, analysis was made on the shape of subsidence area. For the well geocoded results from TerraSAR-X, confirmed by GPS surveying results of corner reflectors, we tried to extract the advance distance of influence besides the subsidence area. Due to the big deformation gradient over stopingfaces, the X-band SAR data could not capture the maximum value subsidence revealed by GPS survey in our preliminary results, the same as C-band EnviSAT data. This will turn to be our research subject in the next few months. 展开更多
关键词 DInSAR Repeated excavation corner reflectors Subsidence TerraSAR-X
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RCS Evaluation of Dihedral corner Renector by Complex Ray Method 被引量:1
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作者 DuHuiping RuanYingzheng 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 1996年第1期31-36,共6页
With the techniques provided by the complex my method,like co,nplex ray expansion, complex mytracing,complex my paraxial approximation, etc.,the back scatter of dihedral corner reflectors is evaluated.Numerical result... With the techniques provided by the complex my method,like co,nplex ray expansion, complex mytracing,complex my paraxial approximation, etc.,the back scatter of dihedral corner reflectors is evaluated.Numerical results show that this method gives good and useful RCS prediction of the targets. 展开更多
关键词 s:radar cross section(RCS) dihedral corner reflector radar absorbing materials.complex ray method(CRM)
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High-energy,alignment-insensitive,injection-seeded Q-switched Ho:yttrium aluminum garnet single-frequency laser 被引量:1
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作者 Dong Yan Yue Yuan +6 位作者 Yunpeng Wang Jiawei Fan Jiaze Wu Xiaoming Duan Sining Li Tongyu Dai Youlun Ju 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2023年第5期157-163,共7页
A high-energy,alignment-insensitive,injection-seeded Q-switched Ho:yttrium aluminum garnet(YAG)singlefrequency laser is developed.Both the slave Q-switched laser and the seed laser are Ho:YAG ring lasers based on a pa... A high-energy,alignment-insensitive,injection-seeded Q-switched Ho:yttrium aluminum garnet(YAG)singlefrequency laser is developed.Both the slave Q-switched laser and the seed laser are Ho:YAG ring lasers based on a pair of corner cubic reflectors.The seed laser has an available power of 830 mW at 2096.667 nm.At 100 Hz,the Q-switched Ho:YAG laser provides a single-frequency pulsed output using injection-seeded technology.The 7.3 mJ single-frequency pulse energy from the slave laser has a pulse width of 161.2 ns and is scaled to 33.3 mJ after passing through the Ho:YAG single-pass amplifier.According to the measurement results of the heterodyne beating technique,the single-frequency pulse has a half-width of 4.12 MHz. 展开更多
关键词 alignment insensitivity corner cubic reflector high energy injection seeding single frequency
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