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Submarine detection plays an important role in modern wars. As a potential technique, synthetic aperture radar (SAR) is used to detect submarines through detecting their wakes on the sea surface. This requires the images of submarine wakes under all kinds of conditions. However, it is difficult to acquire these images by field experiment. In this paper, we propose a method to simulate SAR images of...
A novel method is presented to recognize warheads in the ballistic missile defense. The normalized correlation coefficients and further the matching scores between range profiles (RPs) of warhead are first calculated. By introducing a threshold, the warhead and decoy can be separately classified. The distribution of these results is then modeled as a mathematical model. Based on such distribution,...
Accurate modeling of the ship-to-ship (S2S) fading channels is critical not only to the shipborne automatic identification system design but also to the verification and performance evaluation of other maritime wireless communication systems. The statistical properties of S2S fading channels are quit different from either the terrestrial-based mobile communication channels or the typical fixed-to-mobile...
An improved artificial bee colony algorithm (IABC) is proposed in this paper, which is aimed at some defects of ABC such as low optimization precision and easy to fall into local optimal value. A new method is introduced to produce a new solution when the bees are going on neighborhood search in the improved algorithm. IABC is as simple as ABC to implement, but can greatly improve the ability of seeking...
I/Q channel imbalance in quadrature demodulation is one of the major concerns in the design of synthetic aperture radar (SAR) and inverse SAR (ISAR) receivers. The amplitude and phase mismatches result in the additional mirror signal, which acts as a correlated interference superimposed on the desired signal and, hence, degrades the whole system's performance significantly. In this paper, we first...
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