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It is the basis of realization ship recognition to accurately extract geometric parameters of the ship target in synthetic aperture radar (SAR) images. Due to the unique SAR imaging mechanism, speckle noise, azimuth ambiguity and side lobe effect seriously impact on geometric parameter estimation of the ship target. Therefore, a method is presented to extract geometric parameters of the ship based...
An electrical-balance duplexer (EBD) is a tunable RF front-end concept that seeks to address several key challenges of 4G and 5G mobile systems [1]. The basic principle is shown in Fig. 20.8.1. Duplexer isolation is achieved when the signals in paths 1 and 2 cancel and prevent the TX signal from appearing at the RX port. This cancellation is achieved by “balancing” the antenna impedance ZANT with...
With the development of high frequency and power for the switching power supply, soft switch technique has become more important now. A novel soft switching technique for Buck converter has been investigated in this paper, which has many good performances such as high power, low loss and so on. The main contributions are as follows: 1. A new topology with soft switching has been proposed; 2. The control...
The switching transient process of a high power MOSFET in converter is more complicated; therefore, the study of these processes can make sense of learning the operation and do it safety operation. The contributions of this paper are as follows: 1) the power MOSFET operates from pinch-off region to linear region through out the active region when it works in the turn-on process, the small signal model...
Secure transmission of confidential digital images has become a common interest in both research and applications. As shown in our previous studies, Mixed Image Element (MIE) encryption algorithm is a new and promising image encryption algorithm, however, its security is affected by the unreasonable choice of camouflaged images. To analyze this factor, the definitions of image integral similarity,...
In view of the lower encryption efficiency or the weaker security of current image encryption technology, on the basis of the encryption principle of mixed image element (MIE), a MIE encryption system is proposed in this paper. The mathematical model and structure model of this system are also established. And the encryption efficiency and security analysis is analyzed in detail in this paper. In...
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