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  • COMMUNICATIONS AND RADAR  (2)
  • 1990-1994  (2)
  • 1970-1974
  • 1950-1954
  • 1920-1924
  • 1
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    Robust control of multi-jointed arm with a decentralized autonomous control mechanism (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A decentralized autonomous control mechanism applied to the control of three dimensional manipulators and its robustness to partial damage was assessed by computer simulation. Decentralized control structures are believed to be quite robust to time delay between the operator and the target system. A 10-jointed manipulator based on our control mechanism was able to continue its positioning task in three-dimensional space without revision of the control program, even after some of its joints were damaged. These results suggest that this control mechanism can be effectively applied to space telerobots, which are associated with serious time delay between the operator and the target system, and which cannot be easily repaired after being partially damaged.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Third International Symposium on Artificial Intelligence, Robotics, and Automation for Space 1994 191-195 (SEE N95-23672 07-63); JPL, Third Internati
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental millimeter-wave personal satellite communications system (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Communications Research Laboratory (CRL) has investigated an advanced millimeter (mm)-wave satellite communications system for personal use. Experiments in mm-wave personal satellite communication are to be conducted for 3 years using Japan's Engineering Test Satellite VI (ETS-VI). This paper describes an experimental mm-wave (43/38 GHz) personal satellite communication system, including an onboard transponder and an earth terminal. The on-board transponder is almost completed, and the ground experiment system is still in the design stage. The transponder employs advanced mm-wave solid state technology. It uses 38 GHz high power solid state amplifiers to accelerate the development of mm-wave solid state devices which are indispensable to personal earth terminals. The transponder consists of a 43 GHz receiver with a built-in low noise amplifier, an IF filter section with very narrow bandwidth to improve the carrier-to-noise power ratio of the weak personal communication signal, and two high power amplifiers using newly developed high power Gallium Arsenide (GaAs) metal-semiconductor field effect transistors (MESFETs).
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Proceedings of the Workshop on Advanced Network and Technology Concepts for Mobile, Micro, and Personal Communications; p 55-64
    Format: text
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    NASA TECHNICAL REPORTS
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