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The orthogonal frequency division multiplexing linear frequency modulation (OFDM-LFM) MIMO radar, as a typical MIMO radar has been studied comparatively well. It is necessary to study its countermeasure method. For this purpose, a jamming method is proposed in this paper. Which can degrade the radar performance by transmitting multi-signal synchronously. First, the parameters of OFDM-LFM radar are...
Space-time algorithm based on cyclic correlation matrix is introduced and the cyclostationarity of signals is taken into account. Numerical simulation shows that it can considerably improve the performance of the software defined antenna and therefore be widely used in variant fields.
Abstract-Antennas are key components of wireless communication systems and radar systems. Rectangular waveguide slot antennas are widely applied in ground radar equipments, airborne radars and satellite and space communications. But their design and optimizing are rather complex. Here a neural network is introduced to optimize the length of the slots in a antenna. The result shows that after training,...
Filters are fundamental components widely used in Electric Information and Control Engineering. Filters based on rectangular waveguide have good performance with low loss, high operation frequencies and high power. But the design and optimizing is a rather complex job. In this paper, a neural network is introduced to optimize two parameters in a waveguide band-pass filter. The result shows that after...
It is a common sense that the Doppler frequency shift is vanished when the speed of a planar interface is transverse to the wave incidence. However, our theoretical and experimental research shows that the Doppler frequency shift is non-zero for a curved interface with even purely transverse speed, and this physic effect can be used to detect the surface profile.
A simplified approach to analysis of finite and curved conductor-dielectric periodic (CDP) screen is proposed. The contribution of the element in the real structure is estimated by that of the elaborately constructed virtual infinite planar CDP structure. The analytic results based on Floquet theorem are useable for the proposed approach thus high efficiency and accuracy are obtained. The calculated...
Measurements have shown that when the effects of stray field are not negligible the physical Backward-wave or Left-handed transmission line made of lumped L-C components must be modeled by a balanced Composite right/left-handed transmission line model. Corresponding transition frequency not only really exists but also can be estimated by the experiment proposed. The obtained results may have significance...
In this paper some key technologies of a compact Terahertz Source Based on Free Electron Lasers are studied. In order to obtain a compact Terahertz Source, an independent tunable electron gun played a dominant role. The independent tunable electron gun was calculated firstly. The electron gun can create high-brightness and short-pulse beams (less than 2 ps). The energy spread is less than 0.5%, the...
Periodic dielectric structures are widely used in many areas such as optical communication, material science and millimeter waves in terms of periodic or corrugated waveguide, gratings, leaky wave antennas and bandgap materials. Based on the established rigorous theory for two-dimensionally periodical medium, a great amount of numerical results for cylindrical dielectric waveguide array (CDWA), which...
Based on the established rigorous theory for two-dimensionally periodic (2DP) medium, a great amount of numerical results for Dielectric Waveguide Array (DWA) were presented in this paper. Wave propagation in DWA was analyzed in detail. The applications about transversal and longitudinal propagation in DWA were discussed.
In this paper some key technologies of a THz source based on free electron lasers are discussed. In order to yield exceptionally high quality THz radiation, electron guns are expected to create high-brightness and short-pulse beams, and the normalized rms beam emittance and longitudinal rms emittance should be low. At the same time, a linear accelerator and an undulator should be designed carefully...
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