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Deng B.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Deng B.,National University of Defense Technology | Wu C.-G.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Qin Y.-L.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | And 2 more authors.
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2013

Target micro-motion conveys vital information which is favorable for understanding synthetic aperture radar (SAR) images. However, image defocusing also ensues. Therefore, techniques on micro-motion effect analysis, micro-motion target detection and imaging are gaining more and more attentions in the remote sensing field. These techniques are generally named SAR/micro-motion target indication (SAR/MMTI). In this paper, topics on SAR/MMTI are introduced including its concept, key difficulties, existing experiments, processing approaches, and its application promise. Some directions of future work on SAR micro-motion are predicted at last. Source


Wang T.,National University of Defense Technology | Qu L.-H.,National University of Defense Technology | Qu L.-H.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Guo C.,National University of Defense Technology | And 3 more authors.
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2014

The differential equations of motion of the cloud droplets in wake vortices were derived. The trajectory and velocity distribution of cloud droplets in wake vortices were obtained by solving the equations of motion. Referring to the parameters of the typical W band millimeter-wave radar, the maximum detection range of wake vortex was analyzed. Then a methodology to simulate the radar Doppler characteristics of wake vortices in cloud was proposed, and the Doppler characteristics of wake vortices in cloud under typical resolution conditions were simulated. The simulation results show that Doppler characteristics of wake vortices in cloud are consistent with the velocity characteristics of wake vortices. Source


Zhu J.-D.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Li J.-L.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Gao X.-D.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Ye L.-B.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems | Dai H.-Y.,State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information Systems
Circuits, Systems, and Signal Processing | Year: 2016

The fractional Fourier transform (FRFT) has been used to detect and estimate the parameters of linear frequency-modulated continuous-wave (LFMCW) in low probability of intercept radar waveforms. The FRFT, which is optimal for single linear frequency-modulated (LFM) signals, becomes sub-optimal when applied to LFMCW signals because the observed waveform of this type of signal is composed of concatenated LFM pulses. A new signal processing method, called the periodic FRFT (PFRFT), is proposed for the detection of LFMCW signals. First, the discrete PFRFT is studied and the signal processing gain of this transform for LFMCW signals is analyzed. Second, an adaptive threshold detection and estimation algorithm for LFMCW signals is formulated after analysis of the test statistics of the squared modulus of LFMCW signals when using the probability density function in the presence of Gaussian white noise. It is then proved that PFRFT-based estimation is equivalent to maximum likelihood estimation in the detection and estimation of LFMCW signals. Finally, the results of both the theoretical analysis and verification simulations show that the PFRFT significantly outperforms the FRFT for LFMCW signals. © 2015, Springer Science+Business Media New York. Source

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