摘要 :
The space-borne HgCdTe infrared detector is widely used in missile warning and interception because of its ability to detect the active tail flame of the missile. The performance of the infrared detector on satellite directly affe...
展开
The space-borne HgCdTe infrared detector is widely used in missile warning and interception because of its ability to detect the active tail flame of the missile. The performance of the infrared detector on satellite directly affects the missile's identification and threat assessment. In order to study the effect of temperature on the performance of satellite infrared detector, Noise-Equivalent Temperature Difference(NETD) of the HgCdTe detector is used as the performance reference, and the SBIRS near-earth orbit small satellite's cosmic environment is the analysis background. Radiant energy of the target is analyzed with distance changes. The performance of HgCdTe detector with temperature and distance changes was simulated by mathematics software MATLAB. Which is been used to simulate the change of Noise-Equivalent Temperature Difference due to the increased operating temperature and distance change of HgCdTe infrared detector, which provided calculations reference for the performance analysis of HgCdTe detectors on the satellite.
收起
摘要 :
The space-borne HgCdTe infrared detector is widely used in missile warning and interception because of its ability to detect the active tail flame of the missile. The performance of the infrared detector on satellite directly affe...
展开
The space-borne HgCdTe infrared detector is widely used in missile warning and interception because of its ability to detect the active tail flame of the missile. The performance of the infrared detector on satellite directly affects the missile's identification and threat assessment. In order to study the effect of temperature on the performance of satellite infrared detector, Noise-Equivalent Temperature Difference(NETD) of the HgCdTe detector is used as the performance reference, and the SBIRS near-earth orbit small satellite's cosmic environment is the analysis background. Radiant energy of the target is analyzed with distance changes. The performance of HgCdTe detector with temperature and distance changes was simulated by mathematics software MATLAB. Which is been used to simulate the change of Noise-Equivalent Temperature Difference due to the increased operating temperature and distance change of HgCdTe infrared detector, which provided calculations reference for the performance analysis of HgCdTe detectors on the satellite.
收起
摘要 :
The reconstruction of laser reflection tomography target reconstruction is an important part of the laser reflection tomography radar target detection technology.But currently the acquisition of imaging data for laser reflection t...
展开
The reconstruction of laser reflection tomography target reconstruction is an important part of the laser reflection tomography radar target detection technology.But currently the acquisition of imaging data for laser reflection tomography mainly stays in the laboratory test acquisition phase, for the complete slave laser pulse. There are still gaps in the comprehensive simulation of the complete process of launch propagation, laser and target effects, acceptance of echo data, and target reconstruction. In this paper, based on the above problems, studying the problem of large computational complexity firstly when the sub-rays and the bins are successively intersected. Proposed a fast intersection algorithm based on the boundary of the laser beam, which improves the computational efficiency. Secondly, based on the spatio-temporal distribution characteristics of the lidar signal, the response function of the detection target to the signal is deduced, and the action process model of the two is established. Based on the above key technologies, a target reconstruction simulation system based on laser reflection tomography was constructed. Finally, according to the effect of different sampling intervals and different detection angles on the reconstructed image quality, a contrast simulation experiment was conducted. The image back-propagation algorithm was used to complete the reconstruction of the target 2D contour under different conditions.
收起
摘要 :
The reconstruction of laser reflection tomography target reconstruction is an important part of the laser reflection tomography radar target detection technology.But currently the acquisition of imaging data for laser reflection t...
展开
The reconstruction of laser reflection tomography target reconstruction is an important part of the laser reflection tomography radar target detection technology.But currently the acquisition of imaging data for laser reflection tomography mainly stays in the laboratory test acquisition phase, for the complete slave laser pulse. There are still gaps in the comprehensive simulation of the complete process of launch propagation, laser and target effects, acceptance of echo data, and target reconstruction. In this paper, based on the above problems, studying the problem of large computational complexity firstly when the sub-rays and the bins are successively intersected. Proposed a fast intersection algorithm based on the boundary of the laser beam, which improves the computational efficiency. Secondly, based on the spatio-temporal distribution characteristics of the lidar signal, the response function of the detection target to the signal is deduced, and the action process model of the two is established. Based on the above key technologies, a target reconstruction simulation system based on laser reflection tomography was constructed. Finally, according to the effect of different sampling intervals and different detection angles on the reconstructed image quality, a contrast simulation experiment was conducted. The image back-propagation algorithm was used to complete the reconstruction of the target 2D contour under different conditions.
收起
摘要 :
Changing of temperature in satellite directly influences the performance of the heat pipe. in order to study the influence by temperature change of radiator on the fluid velocity and the pressure in the heat pipe, The finite eleme...
展开
Changing of temperature in satellite directly influences the performance of the heat pipe. in order to study the influence by temperature change of radiator on the fluid velocity and the pressure in the heat pipe, The finite element simulation of the radius of the meniscus in the evaporation section and the condensing section of the heat pipe is simulated, on the basis of analyzing the structural characteristics of the radiator and its embedded heat pipe. By taking the working quality of the heat pipe as the research object and assuming the temperature change, the simulation data of the working state of the heat pipe at a certain temperature is obtained. At the same time, the pressure drop of the heat pipe and the distribution of the flow velocity are simulated. The weak point of the heat pipe is analyzed and the calculation reference is provided for the performance change of heat pipe on satellite-borne radiator.
收起
摘要 :
Changing of temperature in satellite directly influences the performance of the heat pipe. in order to study the influence by temperature change of radiator on the fluid velocity and the pressure in the heat pipe, The finite eleme...
展开
Changing of temperature in satellite directly influences the performance of the heat pipe. in order to study the influence by temperature change of radiator on the fluid velocity and the pressure in the heat pipe, The finite element simulation of the radius of the meniscus in the evaporation section and the condensing section of the heat pipe is simulated, on the basis of analyzing the structural characteristics of the radiator and its embedded heat pipe. By taking the working quality of the heat pipe as the research object and assuming the temperature change, the simulation data of the working state of the heat pipe at a certain temperature is obtained. At the same time, the pressure drop of the heat pipe and the distribution of the flow velocity are simulated. The weak point of the heat pipe is analyzed and the calculation reference is provided for the performance change of heat pipe on satellite-borne radiator.
收起
原文获取