Simulating the real image of the satellite is very improtant for setting the orbit parameters before launching it, at the same time, the imagery can be used in the ground system. In order to accurately simulate the satellite imagery, in this paper the polular methods in simulating the satellite imagery are compared, then the Ray-tracing
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Compared with the traditional raster rendering, ray tracing renderer can easily render a more realistic three-dimensional images relying on simple physical principles. However, due to the need to simulate the actual transmission of light, the amount of computation required by the ray tracing rendering algorithm is very large, which restricts the application of interactive or
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With the rapid development of communication systems, the kinds of mobile service and the number of the mobile users increase. In order to increase the spectrum efficiency and channel capacity, the researchers proposed the concepts of microcell and picocell. In microcell environment, the height of the base station is generally lower than the average height
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MIMO (Multi Input Multi Output) is an effective technique to increase the spectral efficiency of wireless communication systems. It takes full advantage of the spatial diversity and multiplexing features of antennas, achieving large capacity and high speed transmission in limited spectrum. In indoor hotspot scene which LTE-Advanced focuses on, MIMO is an indispensable key technique.
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MIMO (Multi Input Multi Output) is an effective technique to increase the spectral efficiency of wireless communication systems. It takes full advantage of the spatial diversity and multiplexing features of antennas, achieving large capacity and high speed transmission in limited spectrum. In indoor hotspot scene which LTE-Advanced focuses on, MIMO is an indispensable key technique.
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The time-variant effect simulation of natural scenes has always been an importantresearch field in computer graphics. And the time-variant effect simulation of buildingscenes is an important part in this research field. The technologies of time-variantsimulation of building scenes involve in theories and methods of computer graphics,virtual reality, materials science, mechanics, architecture, etc. The research of
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Ray tracing is a true algorithm which can display the virtual scene. The image that the algorithm renders has a very lifelike effect, and the clarity of it can achieve the photo level. The algorithm is simple in principle and easy to implement, therefore the ray tracing algorithm has been a focus of virtual reality
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The time delay and path bending of the radio wave propagation, caused by atmospheric refraction, is one of the key restricting factors in improving the precision of radio wave orientation and velocity measurement systems. Apparently, the atmospheric refractivity profile model and radio wave refractive error correction method should be further studied, and some new results
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Recently, with the rapidly increasing processing power and the growing of the levels of the programmability of graphics processing units (GPUs), GPUs have become popular platforms for doing lots of computation-intensive jobs. More and more researcher began to introduce the GPU to do this kind of computation intensive work, to accelerate the computation processing. The
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Radio Frequency Identification (RFID) is a technology which makes use of RF signals to identify the target and acquire its information automatically. Ordinary location technologies can’t satisfy the needs of indoor environment and location accuracy. Because RFID technology has the advantages of non-contact and non-line-of-sight, it’s very applicable for the location of logistics and targets’
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