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    A DECODING METHOD AND APPARATUS
    1.
    发明申请
    A DECODING METHOD AND APPARATUS 审中-公开

    公开(公告)号：WO2003088505A3

    公开(公告)日：2003-10-23

    申请号：PCT/US2003/010639

    申请日：2003-04-07

    Applicant: ALION SCIENCE AND TECHNOLOGY CORP.

    Inventor： MAIUZZO, Michael, Anthony ,  KENNETH, Kahle, Roberts

    IPC: H03M13/29

    Abstract: A method and apparatus for decoding forward error correction (FEC) encoded data. A stream of units of FEC encoded bits are received, where the units are derived from a transmitted signal, where each unit represents a one-bit data value, and where each unit includes correctness bits that together reflect a level of probability that the one-bit data value represented by the unit differs from corresponding bits in the signal before it was transmitted. The stream of units of FEC encoded bits are decoded by using the quality level of bits to perform soft-decision convolution decoding on the stream of units of FEC bits, where the soft decision convolution decoding produces, for block decoding, a stream of symbols made up of bits. In the stream of units of FEC bits, subsequences of units that are prone to erroneous soft-decision convolution decoding are detected by determining, for the sub-sequences whether the distribution of quality bits indicate the units are below a threshold level of correctness, and by comparing characteristics of that distribution to a given set of characteristics predetermined to be prone to result in incorrect decoding. Among the symbols produced for block decoding, symbols containing one or more bits that correspond to units that were in subsequences detected to be prone to erroneous soft-decision convolution decoding are flagged or tagged, and thereby, errors in the stream of symbols may be soft-decision block decoded by erasing the flagged symbols.

    HELICOPTER BLADE FOLDING APPARATUS
    2.
    发明公开
    HELICOPTER BLADE FOLDING APPARATUS 审中-公开
    直升机刀片折叠设备

    公开(公告)号：EP3297910A2

    公开(公告)日：2018-03-28

    申请号：EP16797219.9

    申请日：2016-05-18

    Applicant: Alion Science and Technology Corp.

    Inventor： PETERSON, Eric ,  SCHWEITZER, Jeremiah ,  ANDERSON, Zachary

    IPC: B64C27/50 ,  B64C27/51

    Abstract: The present invention relates to a blade folding apparatus that may incorporate an overhead blade lifting system that reduces binding loads on blade pins induced by blade weight and pitch, and a folding mechanism that removes the necessity of personnel with external guide-poles to rotate main rotor blades. The apparatus may include flap locks, an overhead lifting system support structure attached to the flap locks, and two blade support beams to create and support a lifting point near each blade's longitudinal and lateral center of gravity. The blade support beams may be fitted with an articulation mechanism that lifts and/or lowers the overhead lifting structure. The apparatus facilitates rapid folding of the main rotor blades, and, when used with blade clamping mechanisms, is capable of aiding in the removal and/or the re-installation of the main rotor blades without external lifting mechanisms.

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