Based on the scattering characteristic,the comparison of RCS(radar cross-section)at different positions of a target in the same direction of incidence can be obtained first by extruding or deleting part of the entity....Based on the scattering characteristic,the comparison of RCS(radar cross-section)at different positions of a target in the same direction of incidence can be obtained first by extruding or deleting part of the entity.A simulation method of aerial&space targets echo characteristics(A&STEC)is proposed that is universal to aerial and space targets.We utilize a fixed-wing UAV(unmanned aerial vehicle)and typical missiles in simulation.The echo signal modulation characteristic parameters are calculated theoretically by the atmospheric attenuation model,the finite element method and a MUMPS solver.The verification simulations show that this method can analyze the influence of the target shape,incident direction,detection position and detection frequency on echo waveform,intensity and energy distribution.The results show that the profile of echo waveform can invert the general shape of the target.The relationship between time and intensity can determine whether the target is moving towards or away from the detector in addition.These conclusions can provide a reference for the ballistic missile target tracking and the defense against UVA intrusion in theory.展开更多
Through analyzing the influence on echo signal by factors of kinematical parameters of airborne SAR platform and radar antenna direction, this letter, on the basis of classical SAR echo signal analogue algorithm, puts...Through analyzing the influence on echo signal by factors of kinematical parameters of airborne SAR platform and radar antenna direction, this letter, on the basis of classical SAR echo signal analogue algorithm, puts forward certain airborne SAR echo signal analogue algorithm of distance directional frequency domain pulse coherent accumulation, and goes through simulation. The simulation results have proved the effectiveness of this algorithm.展开更多
为提高小目标识别性能,多波束测深仪通常使用短连续脉宽信号(Continuous Wave,CW)进行探测。然而,短脉宽信号携带能量有限,测深最大距离及扫测宽度得不到保证。发射长脉宽线性调频(Linear Frequency Modulation,LFM)信号,结合脉冲压缩...为提高小目标识别性能,多波束测深仪通常使用短连续脉宽信号(Continuous Wave,CW)进行探测。然而,短脉宽信号携带能量有限,测深最大距离及扫测宽度得不到保证。发射长脉宽线性调频(Linear Frequency Modulation,LFM)信号,结合脉冲压缩技术可解决这一矛盾。本文主要介绍LFM信号在国产iBeam8120浅水多波束测深仪中的工程应用情况,重点阐述接收回波信号处理方法,实测数据脉冲压缩效果,并分析了相位差精度影响因素。外场试验数据表明:经脉压处理后,声呐图回波能量更为集中,底检测性能得到改善。展开更多
文摘Based on the scattering characteristic,the comparison of RCS(radar cross-section)at different positions of a target in the same direction of incidence can be obtained first by extruding or deleting part of the entity.A simulation method of aerial&space targets echo characteristics(A&STEC)is proposed that is universal to aerial and space targets.We utilize a fixed-wing UAV(unmanned aerial vehicle)and typical missiles in simulation.The echo signal modulation characteristic parameters are calculated theoretically by the atmospheric attenuation model,the finite element method and a MUMPS solver.The verification simulations show that this method can analyze the influence of the target shape,incident direction,detection position and detection frequency on echo waveform,intensity and energy distribution.The results show that the profile of echo waveform can invert the general shape of the target.The relationship between time and intensity can determine whether the target is moving towards or away from the detector in addition.These conclusions can provide a reference for the ballistic missile target tracking and the defense against UVA intrusion in theory.
文摘Through analyzing the influence on echo signal by factors of kinematical parameters of airborne SAR platform and radar antenna direction, this letter, on the basis of classical SAR echo signal analogue algorithm, puts forward certain airborne SAR echo signal analogue algorithm of distance directional frequency domain pulse coherent accumulation, and goes through simulation. The simulation results have proved the effectiveness of this algorithm.
文摘为提高小目标识别性能,多波束测深仪通常使用短连续脉宽信号(Continuous Wave,CW)进行探测。然而,短脉宽信号携带能量有限,测深最大距离及扫测宽度得不到保证。发射长脉宽线性调频(Linear Frequency Modulation,LFM)信号,结合脉冲压缩技术可解决这一矛盾。本文主要介绍LFM信号在国产iBeam8120浅水多波束测深仪中的工程应用情况,重点阐述接收回波信号处理方法,实测数据脉冲压缩效果,并分析了相位差精度影响因素。外场试验数据表明:经脉压处理后,声呐图回波能量更为集中,底检测性能得到改善。