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Orthogonal netted radar systems (ONRS) can fundamentally improve radar performance by using a group of specially designed orthogonal polyphase code signals. However, the existing numerical solutions only address autocorrelation and cross-correlation properties with the result that the signals degrade severely in the presence of small Doppler shifts. In the context of these problems, a new set of polyphase...
The influence of FM interference on correlation detection performance of the pseudo random code continuous wave (PRC-CW) radar is analyzed. It is found that the correlation output deteriorates greatly when the FM interference power exceeds the anti-jamming limitation of the radar. According to the fact that the PRC-CW radar return signal is a wideband pseudo random signal occupying the whole TF plane,...
In this paper, we have described an accurate and efficient shadowing recognition method based on octree data structure for efficiently judging the illuminated regions in electrically large objects. The physical optics method is used to calculate a bistatic RCS curve for target VFY-218. The theory of shadowing recognition is a hybrid method consists of traditional method and the octree data structure...
A new method is proposed to analyze multi-component linear frequency modulated (LFM) signals, which eliminates cross terms in conventional Wigner-Ville distribution (WVD). The approach is based on Radon transform and Hilbert-Huang transform (HHT), which is a recently developed method adaptive to non-linear and non-stationary signals. The complicated signal is decomposed into several intrinsic mode...
This paper presents a more robust method to determine the surface wave poles and corresponding surface wave components. The spectral-domain Green's functions are reformatted in the recursive fractional form in such a manner that an equivalent denominator could be created and contain all wanted poles. Once the poles are found using a simple root-searching method, the surface wave terms can be obtained...
Computer cyclic check is widely used in many different fields. Some limitations as well as bugs of classical algorithms in the computer cyclic check system are analyzed in detailed. In order to overcome these advantages, two series of new algorithms are set up in this paper, one of which is built for the computer cyclic check system with fixed reference value and the other for the computer cyclic...
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