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A cross-entropy based parameter is proposed to measure the difference between a river area and others. This parameter can be employed for ship detection from a polarimetric SAR image. After deciding the boundaries of the river area, ships are detected only in the river area instead of the whole site. Therefore, most of the false alarms are eliminated. Finally, the performance of this new approach...
Digital image synthesis (DIS) is a specific counter-ISAR technique which employs a false target synthesized to deceive the imaging radar. To make the synthesized false missile images more actual, the distribution of the scattering centers for the according false object must be similar to the real-time ISAR images of a true BM over the whole trajectory. This paper presents a novel process to synthesize...
Backgrounds and advantages of sea surface wind remote sensing technique based on GPS and the ocean scattered signal measure technique are introduced. Five main techniques are discussed as improving the signal noise ratio, dual front-end receiver design, calculating the specular point code delay, working modes configuration and the embedded firmware function. Inshore flight tests were done in Tianjin...
In this paper a refined chirp scaling algorithm for spaceborne synthetic aperture radar (SAR) imaging is presented. At first, the model of spaceborne SAR is analyzed. Based on the squint range model, a refined chirp scaling algorithm is derived. And it is suitable for precise imaging of high resolution spaceborne SAR with large range cell migration. Based on the refined chirp scaling algorithm, the...
In this paper, a new approach to speckle filtering of synthetic aperture radar (SAR) data is presented. We define a parameter space consisting of two orthogonal subspaces - the signal subspace and the noise subspace. Then, the full polarimetric information from the signal subspace is obtained after speckle filtering. Moreover, edges of different kinds of targets are preserved. Using polarimetric SAR...
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