The high resolution instantaneous Doppler frequency of different time is obtained by processing the Radar echo data with short time Fourier transform or Gabor transform,then the instantaneous ISAR images of different time are obtained by computer experiment.
通过对回波数据进行短时傅里叶变换或Gabor变换,得到不同时刻的高分辨瞬时多普勒谱,然后对观测数据段的不同时刻进行瞬时成像。
The high resolution instantaneous Doppler frequency spectrum at different times is obtained by processing the radar echo data with SPWVD or spectrogram,then the instantaneous ISAR images from different times are obtained.
研究了两种时频分布———平滑伪W igner-V ille分布和谱图在机动飞行目标ISAR成像中的应用,通过计算回波数据的平滑伪W igner-V ille分布或谱图,得到不同时刻的高分辨瞬时多普勒谱,然后对观测数据段的不同时刻进行瞬时成像,仿真数据和实测数据成像结果验证了该方法的有效性。
Regarding the characteristic of high speed target echo which consisted of multi-component LFM signal with the same chirp rates,a method based on instant range profile using adaptive STFT was presented.
首先建立高速运动目标宽带雷达回波模型,分析了高速运动对目标一维距离像的影响,针对其回波是调频斜率相同的多分量LFM信号的特点,提出利用自适应短时傅立叶变换的方法获得一维瞬时距离像,消除了高速运动目标距离压缩中的色散效应,经过运动补偿和横向分辨,最终获得目标清晰的二维像。
ISAR Instantaneous Imaging Algorithm Based on Time-freuqency Analysis
基于时频分析的ISAR瞬时成像算法
Imaging of Fast-moving and Maneuvering Target Based on Instantaneous Range and Instantaneous Doppler Technique
基于瞬时距离-瞬时多普勒的高速机动目标成像
Instant range-Doppler imaging of high speed targets
高速运动目标的瞬时距离-多普勒成像
A new range-instantaneous Doppler imaging method in Inverse Synthetic Aperture Sonar based on time-frequency analysis
一种基于时频分析的逆合成孔径声呐的距离-瞬时多普勒成像方法
instant print film, in rolls, sensitized, unexposed
瞬时印制感光胶片,成卷,未曝光
Independent Component Analysis Based on Instantaneous Power of fMRI Data
基于fMRI瞬时功率的独立成分分析
Time elapsed so quickly just like the snowflakes melting in her hands.
时间就像手心里的雪花，瞬间也变得无影无踪。
Keywords: unsupervised artificial neural network, image identification, instantaneous velocity.
关键词：无监督式类神经网路、影像辨识、瞬时速度。
Study of Digital Image Velocimetry for Simultaneous Flow Fileds in Two Dimensional Plane;
平面二维瞬时流速场数字图像测速技术研究
Electromagnetic Theoretical Wave-field High-distinguish Imaging Technology Research
瞬变电磁虚拟波场高分辨成像技术研究
instantaneous state of velocity
瞬时速度, 速度的瞬时状态, 速度瞬时值
He explained that gravity was not an instantaneous force as Newton assumed, but that it took time to travel.
他解释，重力不像牛顿说的那样是瞬时传播的，它的传播需要时间。
With instantaneous detector of printing image, the printing quality can be controlled at any time.
印刷图像瞬时检测装置，可随时了解掌握印刷质量。
Chelsea, a London district, was suddenly fashion's hottest property,
切尔西，一个伦敦街区，瞬间成为时尚前沿，
The definition implies two resultant temperatures, transitory and steady state.
该定义包括有瞬时的和稳态的两种合成温度。
Research on Production of Polyhydroxyalkanoates by Aerobic Dynamic Feeding Approach;
好氧瞬时供料法合成聚羟基烷酯的研究
Models of cost & profit evaluation in internet environment and instant decision;
基于INTERNET的成本效益评估模型与瞬时决策
Effects of Intelayer Composition on Transient Liquid Phase Bonding Process
中间层成分对瞬时液相扩散连接过程的影响