Japanese Earth Resources Satellite-1 synthetic aperture radar

Article Abstract:

The Japanese Earth Resources Satellite-1 (JERS-1) advanced satellite carries a synthetic aperture radar (SAR) and an optical sensor (OPS) intended to be used for resource exploration, land survey, agriculture, forestry, fishery, environmental protection, disaster prevention and coastal monitoring. JERS-1 is a three-axis stabilized satellite; SAR and OPS data are recorded by a mission data recorder (MDR) that supports global coverage, while a mission data transmitter (MDT) transmits real-time and reproduced data of SAR and OPS to the ground through two X-band carriers. The OPS is comprised of the visible and near infrared radiometer and the short wavelength infrared radiometer. The SAR active microwave sensor is designed to have as large an incident angle as possible and to have ground resolution higher than 20 meters to get geological features with the smallest possible foreshortening effect. SAR design and performance are described in detail.

Space vehicle equipment, not elsewhere classified, Satellites (Astronomical bodies), Geophysics, Geology, Measurement, Satellites, Space Craft, Sensor, Scientific Research, Instruments, technical

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Tomographic radiopharmaceutical imaging

Article Abstract:

Emission computed tomography (ECT), or tomographic radiopharmaceutical imaging, has seen major advances in two complementary directions: positron emission computed tomography (PET) and single photon emission computed tomography (SPECT). A overview of ECT is provided plus a basic understanding of instrumentation, functioning, capabilities, limitations, and trends in PET and SPECT. ECT produces in vivo three-dimensional images of the distribution of pharmaceuticals that are labeled with a gamma ray-emitting radionuclide. Algorithms extract the 3D map from 2D images generated from the scanning of emissions from varied angles about the patient. PET detects the two 511KeV annihilation protons emitted by such positron emitters as C-11, N-13, O-15, and F-18. SPECT detects gamma rays emitted singly and sequentially by Tc-99m and T-201 radionuclides.

Systems analysis, Medical research, Image processing, Computer graphics, Systems development, Three dimensional graphics, Specifications, System Development, System Design, Applications, Three-Dimensional Graphics, Utilization, Two-Dimensional Graphics

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A Tomographic Formulation of Spotlight-Mode Synthetic Aperture Radar

Article Abstract:

Synthetic aperture radar (SAR) and computer-aided tomography (CAT) are known techniques for high-resolution image construction. In an SAR system, the desired image is a terrain map. Spotlight-mode SAR can be interpreted as a tomographic reconstruction problem. A theoretical model is used to analyze basic SAR functions. A back projection algorithm can also reconstruct images. A block diagram shows required processing for spotlight-mode SAR.

Pattern recognition (Computers), Technology, Tracking systems (Navigation), Pattern Recognition, Sampling, Filtering, Image Reconstruction, CAT Scanners, Tracking Systems

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