摘要 :
Since the hole distance, quantity of holes, size, etc. of the pre-perforated tipping paper cannot be adjusted during production, the problems caused by the its function is: on the one hand, the filter ventilation rate cannot be ad...
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Since the hole distance, quantity of holes, size, etc. of the pre-perforated tipping paper cannot be adjusted during production, the problems caused by the its function is: on the one hand, the filter ventilation rate cannot be adjusted in real time with low stability; on the other hand, the corresponding consumption and cost of the raw materials are high. Therefore, an online laser perforating device is designed. By directly performing 360° laser perforation on the surface of the semi-finished cigarette, the stability of the ventilation rate of the cigarette filter can be effectively controlled and the production cost can be reduced. The application results shown that the use of online laser perforation device, by adjusting the perforation time, quantity and size of the hole, the average pass rate of the filter ventilation rate has increased by 17.3%, and the standard deviation pass rate has increased by 10.8%, which effectively improves the stability of ventilation rate for the filter. The average consumption cost of the materials for every 10,000 cigarettes of a certain brand is reduced by 41.2%, which effectively reduces the cost of cigarettes, and can set the different quantity of perforating holes and the filter ventilation rate values according to process requirements.
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摘要 :
Since the hole distance, quantity of holes, size, etc. of the pre-perforated tipping paper cannot be adjusted during production, the problems caused by the its function is: on the one hand, the filter ventilation rate cannot be ad...
展开
Since the hole distance, quantity of holes, size, etc. of the pre-perforated tipping paper cannot be adjusted during production, the problems caused by the its function is: on the one hand, the filter ventilation rate cannot be adjusted in real time with low stability; on the other hand, the corresponding consumption and cost of the raw materials are high. Therefore, an online laser perforating device is designed. By directly performing 360° laser perforation on the surface of the semi-finished cigarette, the stability of the ventilation rate of the cigarette filter can be effectively controlled and the production cost can be reduced. The application results shown that the use of online laser perforation device, by adjusting the perforation time, quantity and size of the hole, the average pass rate of the filter ventilation rate has increased by 17.3%, and the standard deviation pass rate has increased by 10.8%, which effectively improves the stability of ventilation rate for the filter. The average consumption cost of the materials for every 10,000 cigarettes of a certain brand is reduced by 41.2%, which effectively reduces the cost of cigarettes, and can set the different quantity of perforating holes and the filter ventilation rate values according to process requirements.
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摘要 :
Under the precision constraint of interferometric SAR simulation applications, a range frequency fast algorithm is proposed to increase the InSAR raw signal simulation efficiency and the GPGPU technique is used to implement the ra...
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Under the precision constraint of interferometric SAR simulation applications, a range frequency fast algorithm is proposed to increase the InSAR raw signal simulation efficiency and the GPGPU technique is used to implement the raw signal simulation of large 10km × 10km nature scene. The experiment results validate the proposed fast algorithm and the GPGPU technique. The total speedup of GPU over CPU is 4, and some local grogram speedup is over 14, which makes the InSAR raw signal simulation more practical in the InSAR system simulation.
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摘要 :
Under the precision constraint of interferometric SAR simulation applications, a range frequency fast algorithm is proposed to increase the InSAR raw signal simulation efficiency and the GPGPU technique is used to implement the ra...
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Under the precision constraint of interferometric SAR simulation applications, a range frequency fast algorithm is proposed to increase the InSAR raw signal simulation efficiency and the GPGPU technique is used to implement the raw signal simulation of large 10km × 10km nature scene. The experiment results validate the proposed fast algorithm and the GPGPU technique. The total speedup of GPU over CPU is 4, and some local grogram speedup is over 14, which makes the InSAR raw signal simulation more practical in the InSAR system simulation.
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摘要 :
Point spread function is commonly used for radar imaging evaluation. But in the measured ISAR (inverse synthetic aperture radar) image, it is hard to find an ideal scattering center with a standard point spread function. The pheno...
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Point spread function is commonly used for radar imaging evaluation. But in the measured ISAR (inverse synthetic aperture radar) image, it is hard to find an ideal scattering center with a standard point spread function. The phenomenon leads to a difficulty in evaluating the measured ISAR image. In this paper, we proposed a new method to accomplish this task. Firstly, a geometry of the target is established. Scattering database is obtained based electro-magnetic calculation. Then, the echo at the same posture with the measured ISAR image is obtained based on interpolation in the electro-magnetic scattering database. Lastly, the simulated ISAR image and the measured ISAR image are evaluation simultaneously. The same region in these two ISAR image are selected and evaluated with resolution. Despite the resolution of the selected region may deviate from the ideal value, the measured ISAR image can still be well evaluated based on whether the resolution of the measured ISAR image coincides with that of the simulated ISAR image. Experiments are carried out and the result show the proposed method has good performance.
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摘要 :
Synthetic aperture radar (SAR) is an all-weather high resolution imaging radar. When there is a moving target, the target is often submerged by the surrounding strong background. Therefore, it is very hard to detect the moving tar...
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Synthetic aperture radar (SAR) is an all-weather high resolution imaging radar. When there is a moving target, the target is often submerged by the surrounding strong background. Therefore, it is very hard to detect the moving target. In this paper, we proposed a new ground moving target (GMT) imaging method based on spectra recognition. Firstly, the velocity and position of the moving target is obtained based on GMTI method. And the spectra of GMT is recognized. Then, the squint angle and the pulse repeat frequency (PRF) is well designed, which can guarantee that the clutter and GMT spectra can be separated clearly. Unpolluted GMT spectra is obtained by a band-pass filter. Lastly, for GMT SAR imaging, a moving target is regarded as a steady target under an equivalent geometry with a new equivalent squint angle and a new SAR platform velocity. The SAR image is obtained with the range-Doppler algorithm. The experimental results obtained by simulation show the feasibility of the proposed method.
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摘要 :
Synthetic aperture radar (SAR) is an advanced imaging sensor that can image side-looking terrain. Unlike a stationary scene, due to not knowing the motion parameters, ground moving target (GMT) is defocused in a background image, ...
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Synthetic aperture radar (SAR) is an advanced imaging sensor that can image side-looking terrain. Unlike a stationary scene, due to not knowing the motion parameters, ground moving target (GMT) is defocused in a background image, which causes difficulties in their use for further applications. This paper proposes a new ground moving target imaging method. The motion parameters are estimated according to the estimated Doppler parameters. Range cell migration (RCM) are estimated and corrected accordingly, which helps get a clear GMT image. Experimental results obtained from extensive numerical simulated data validate our proposed approach.
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摘要 :
Synthetic aperture radar (SAR) is an advanced imaging sensor that can image side-looking terrain. Unlike a stationary scene, due to not knowing the motion parameters, ground moving target (GMT) is defocused in a background image, ...
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Synthetic aperture radar (SAR) is an advanced imaging sensor that can image side-looking terrain. Unlike a stationary scene, due to not knowing the motion parameters, ground moving target (GMT) is defocused in a background image, which causes difficulties in their use for further applications. This paper proposes a new ground moving target imaging method. The motion parameters are estimated according to the estimated Doppler parameters. Range cell migration (RCM) are estimated and corrected accordingly, which helps get a clear GMT image. Experimental results obtained from extensive numerical simulated data validate our proposed approach.
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摘要 :
HRWS-SAR steers the antenna to increase the synthetic aperture which causes the radar changes beam squint angle gradually. The squint angle increases with the demanding of the resolution and swath width. With the squint increasing...
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HRWS-SAR steers the antenna to increase the synthetic aperture which causes the radar changes beam squint angle gradually. The squint angle increases with the demanding of the resolution and swath width. With the squint increasing, the relative velocity between radar and lighting swath may reach several km/s. It causes the intra-pulse modulation on the echo. The traditional pulse compressing under the stop-go-stop assumption has bad performance including resolution decrease and PSLR increase. The paper established the echo model. The chirp rate is slightly changed because of the relative velocity. And velocity compensation method is put forward. The experiment results show that the pulse is well compressed. The PSLR and the resolution are restored to normal level.
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摘要 :
HRWS-SAR steers the antenna to increase the synthetic aperture which causes the radar changes beam squint angle gradually. The squint angle increases with the demanding of the resolution and swath width. With the squint increasing...
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HRWS-SAR steers the antenna to increase the synthetic aperture which causes the radar changes beam squint angle gradually. The squint angle increases with the demanding of the resolution and swath width. With the squint increasing, the relative velocity between radar and lighting swath may reach several km/s. It causes the intra-pulse modulation on the echo. The traditional pulse compressing under the stop-go-stop assumption has bad performance including resolution decrease and PSLR increase. The paper established the echo model. The chirp rate is slightly changed because of the relative velocity. And velocity compensation method is put forward. The experiment results show that the pulse is well compressed. The PSLR and the resolution are restored to normal level.
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