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When radar transmits wideband signals, the range resolution is smaller than the size of the target. Then the target is spread in the range dimension and the energy is scattered. In this paper, the characteristic of the echoes for wideband radar is firstly described. Then a new method called segment integrated correlation detection (SICD) is proposed for moving target detection in a wideband radar...
In many applications, wavelets with rational dilation have more expected properties such as orthogonality and interpolation than dilation 2. This paper studied the rational dilation factor p/q orthonormal wavelet bases based on multiresolution analysis, stated that the orthonormal wavelet bases should consist of p−q functions ψ1,ψ2,…,ψp-q in W0 = V1 ⊖ V0 and established a perfect reconstruction condition...
Animal sonar performance is quite better than man-made sonar system, especially in cluttered environment. The harmonic structure sound produced by big brown bat played an important role in echolocation in forests situation. Bat-like harmonic signal resolution was analyzed by Auto-Wideband Ambiguity Function (WAF). For Hyperbolic Frequency Modulation (HFM) signal, the time-scale resolution was related...
Matched filtering for linear frequency modulation (LFM) signal is applied more and more widely, and it is required to increase the performance of matched filtering for LFM signal continuously. Adding window is used to achieve this goal. In this article, five typical window functions are selected to act on LFM signal to discuss the impacts of different window functions on the performance of matched...
Traffic video surveillance cameras are widely used in China today. However, the resolution of the output video is very low and it is difficult to recognize the license number of the vehicles that broke traffic regulations. The Super-resolution image reconstruction techniques thus can be used to solve this problem. In this paper, we examine several important superresolution algorithms and developed...
Huge structures navigating underwater always have multi radiated noise sources distributed on different part. Therefore, noise source positioning is regarded as the core of noise control. In order to make the measuring system more effective, a new method for underwater near field moving sources is proposed in this paper. The new method establishes a mathematical model based on the correlation between...
Classic coherence analysis has been commonly used as a effective method for the analysis of stationary signals. To study the instantaneous coherence between non-stationary signals, we extended the concept of coherence to time-varying coherence using some time-frequency analysis methods. Wavelet-based coherence is one of the most widely used time-varying coherence methods, but few researchers have...
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