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Calibration of the active phased-array antennas for synthetic aperture radar (SAR) is a complicated mission. The phase-encoding method is used to monitor and characterize individual transmit/receive modules of the active phased-array antenna, which has been demonstrated to be an effective method by TerraSAR-X in a spaceborne environment. The error source due to finite phase-encoding setting accuracy...
Four protection schemes based on RS and Raptor code as well as FEC and hybrid FEC-ARQ are analyzed and compared for erasure channels in this paper. RS code is a classic block channel code while Raptor code is a new kind of rateless code, which can produce a potentially infinite stream of packets. FEC and hybrid FEC-ARQ schemes based on RS and Raptor code are described and compared in detail. Then...
Magnetic field inhomogeneity is a long-standing problem in magnetic resonance imaging (MRI) and spectroscopic imaging (MRSI). Specifically, in MRSI, field inhomogeneity, if not corrected, can cause frequency shifts, line broadening, and lineshape distortions in the spectral peaks. This paper addresses the problem of correcting the field inhomogeneity effects on limited k-space MRSI data. A penalized...
In this paper, a novel digital video watermarking method based on motion vectors of P-frame is proposed. Rotating attack can be resisted efficiently by using this method and only half of the points need to be searched. In this method, the region information of the motion vector is used to hide copyright information. In the process of encoding, every macroblock search its best match block in the special...
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