The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Hao Ling - One of the best experts on this subject based on the ideXlab platform.
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wavelet analysis of Radar Echo from finite size targets
IEEE Transactions on Antennas and Propagation, 1993Co-Authors: Hyeongdong Kim, Hao LingAbstract:The wavelet analysis technique is applied to analyze the frequency-domain electromagnetic backscattered signal from finite-size targets. Since the frequency-domain Radar Echo consists of both small-scale natural resonances and large-scale scattering center information, the multiresolution property of the wavelet transform is well suited for analyzing such multiscale signals. Wavelet analysis examples of backscattered data from an open-ended waveguide cavity and a plasma cylinder are presented. Compared with the conventional short-time Fourier transform, the wavelet transform provides a more efficient representation of both the early-time scattering center data and the late-time resonances. The different scattering mechanisms are clearly resolved in the time-frequency representation. >
Hyeongdong Kim - One of the best experts on this subject based on the ideXlab platform.
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wavelet analysis of Radar Echo from finite size targets
IEEE Transactions on Antennas and Propagation, 1993Co-Authors: Hyeongdong Kim, Hao LingAbstract:The wavelet analysis technique is applied to analyze the frequency-domain electromagnetic backscattered signal from finite-size targets. Since the frequency-domain Radar Echo consists of both small-scale natural resonances and large-scale scattering center information, the multiresolution property of the wavelet transform is well suited for analyzing such multiscale signals. Wavelet analysis examples of backscattered data from an open-ended waveguide cavity and a plasma cylinder are presented. Compared with the conventional short-time Fourier transform, the wavelet transform provides a more efficient representation of both the early-time scattering center data and the late-time resonances. The different scattering mechanisms are clearly resolved in the time-frequency representation. >
Jibin Zheng - One of the best experts on this subject based on the ideXlab platform.
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Target Detection Algorithm for Hypersonic Vehicle Based on Wideband Radar Echo Model
IEEE Access, 2019Co-Authors: Zhiyong Niu, Jibin ZhengAbstract:High speed of the hypersonic vehicle can cause the noticeable scale effect and intra-pulse Doppler on Radar Echoes, especially under the large time-bandwidth product transmitting signal. Under this condition, the conventional narrowband matched filter can introduce an obvious output signal-to-noise ratio loss to the Radar target detection and big errors to motion parameter estimation. In addition, the long-time integration and high speed can lead to the across range unit, which further deteriorates the detection performance and motion parameter estimation. In order to address these problems, we first mathematically analyze the wideband Radar Echo model (because the narrowband condition is not met for hypersonic vehicle detection) and obtain the mathematic relationship among the scale effect, speed, and time-bandwidth product. Thereafter, based on this mathematic relationship, we define a generalized matched filter and propose a coherent long-time integration algorithm for the hypersonic vehicle detection. Compared with the full parameter space searching algorithm, this proposed algorithm obtains nearly the same anti-noise performance with a much lower computational complexity. Through mathematical analyses and numerical simulations, we verify the effectiveness of the proposed algorithm. It is worthwhile noting that the aforementioned mathematic relationship provides a theoretical basis for the transformation from the wideband Radar Echo model to the conventional narrowband Radar Echo model. On this basis, the hypersonic vehicle detection algorithm can be studied widely.
Gui Xiao - One of the best experts on this subject based on the ideXlab platform.
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Radar Echo Simulation Based on HLA
Computer Simulation, 2005Co-Authors: Gui XiaoAbstract:Simulation system based on high level architecture for attack - defense weapon is introduced. The system adapted the High Level Architecture ( HLA) as the standard of computer simulation. It adapted multi - Radar net, used Oracle database management data sampled from jammer. It made multi - Radar congratulate together, and communication among them. The system could be easyly controlled by control panel, and realized real -time running, and flexible, multiform simulation. This thesis discussed the model and realization of the part of Radar Echo simulation in this system. The jammers' data were integrated with Radar real targets Echo as input of system.
Josh Kohut - One of the best experts on this subject based on the ideXlab platform.
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hf Radar sea Echo from shallow water
Sensors, 2008Co-Authors: Belinda J Lipa, Bruce Nyden, Don Barrick, Josh KohutAbstract:HF Radar systems are widely and routinely used for the measurement of ocean surface currents and waves. Analysis methods presently in use are based on the assumption of infinite water depth, and may therefore be inadequate close to shore where the Radar Echo is strongest. In this paper, we treat the situation when the Radar Echo is returned from ocean waves that interact with the ocean floor. Simulations are described which demonstrate the effect of shallow water on Radar sea-Echo. These are used to investigate limits on the existing theory and to define water depths at which shallow-water effects become significant. The second-order spectral energy increases relative to the first-order as the water depth decreases, resulting in spectral saturation when the waveheight exceeds a limit defined by the Radar transmit frequency. This effect is particularly marked for lower Radar transmit frequencies. The saturation limit on waveheight is less for shallow water. Shallow water affects second-order spectra (which gives wave information) far more than first-order (which gives information on current velocities), the latter being significantly affected only for the lowest Radar transmit frequencies for extremely shallow water. We describe analysis of Radar Echo from shallow water measured by a Rutgers University HF Radar system to give ocean wave spectral estimates. Radar-derived wave height, period and direction are compared with simultaneous shallow-water in-situ measurements.
