1999 Fiscal Year Final Research Report Summary
Research on radio communication system between moving robots in a small closed space
| Project/Area Number |
09650433
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
情報通信工学
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| Research Institution | Setsunan University |
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Principal Investigator |
OGAWA Eiichi Setsunan University, Faculty of Engineering, Professor, 工学部, 教授 (80288969)
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| Project Period (FY) |
1997 – 1999
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| Keywords | mobile communication / robot / multipath propagation / indoor propagation |
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| Research Abstract |
Robots or micromachines are required for working in the limited small space where man or usual machines cannot enter. Considering such environments, a basic research was conducted on the radio communications and control between working robots. In these radiowave propagation environments, it becomes the problem to clarify the transmission characteristics of multipath wave propagation and quite near antenna separation.
In this investigation, these propagation characteristics were experimentally obtained using a network analyzer and a standard signal generator. The artificial environments, a measurement system, and software for propagation characteristics evaluation are developed.
(1) In the communications between robots, transmitting and receiving antenna separation probably becomes quite near. The transmission characteristics are experimentally studied for such cases. Even in the separation within less than a wavelength, the received level are clarified to be proportional to inverse of the square of the separation. Moreover, in the case of cross polarization, the received level can be evaluated by ordinary propagation distance characteristics formula, similar to co-polarization.
(2) The various obstacles in a propagation path become problem in the closed space. To investigate the effects of them, the transmission and diffraction effects are experimentally studied for various materials. The effect of reflected waves are also measured. In the case that the direct wave is small, the frequency dependence of transmission channel becomes large and may cause the degradation of transmission quality.
(3) The radio signals on fiber optic link system is studied to miniaturized and reduce the cost of radio base stations. The degradation in the radio and fiber optic-link characteristics is small so that the system can be applied to the radio base stations for the robot communications.
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Research Products
(2 results)
