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The effective classification methods of the small target objects in the no-fly zone are of great significance to ensure safety in the no-fly zone. But, due to the differences of the color and texture for the small target objects in the sky, this may be unobvious, such as the birds, unmanned aerial vehicles (UAVs), and kites. In this paper, we introduced the higher layer visualizing feature extraction...
Given the different transmission characteristics under the wavelet transform (WT) domain and the different distribution characteristics of frequency domain of the signal and noise, a novel approach for detecting laser radar target based on wavelet transform has been proposed. Usually, wavelet decomposition has been used to de-noise a digital signal corrupted by noise. In our approach, we applied the...
According to the different transmission characteristics under the wavelet transform(WT) domain and the different distribution characteristics of frequency domain of the signal and noise, a novel approach for detecting weak signal laser radar target based on wavelet transform has been proposed. In many cases, wavelet decomposition has been used to de-noise a digital signal submerged by mass noise....
Conventional radars have less invisibility, but the passive radars based on TV, FM signals also have some restrictions in SAR imaging by a range of issues such as ground electromagnetic environment and signal silence. This paper presents a new method of passive SAR imaging based on navigation satellite signal with single/multiple receive-only mode in FRFT domain. The received reflection of single...
Transmission over wireless channels will introduce intersymbol interference (ISI) as well as interchannel (or intercarrier) interference (ICI). To decrease the effects of ICI, this paper proposes a multi-tap equalizer for the OFDM system based on the fractional Fourier transform (FrFT). In this FrFT-OFDM system, traditional Fourier transform is replaced by fractional Fourier transform to modulate...
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