The accuracy of the Global Positioning System (GPS) can be improved by differential techniques. For maritime applicationsa DGPS service with transmissions by maritime radiobeacons in the MF band is provided. It offers a position accuracy of approximately 5 m. For the data link a minimum shift keying (MSK) modulation scheme has been recommended. The adjacent channel interference at the maximum transmission rate might not be consistent with existing frequency plans. Therefore an improvement of spectral efficiency is proposed using a Gaussian-shaped MSK (GMSK). In this case the adjacent channel interference to a radiobeacon direction finder (DF) or a DGPS receiver can be reduced significantly. The GMSK signal can also be received by a coherent MSK receiver the negligible performance degradation. We present the results of numerical calculations for different time-bandwidth products of the GMSK modulation scheme in the transmitter.


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    Title :

    Reduction of interference from DGPS transmissions in the MF band using a GMSK modulation scheme


    Additional title:

    Störreduzierung bei der DGPS-Übertragung


    Contributors:
    Müller, T. (author) / Rohling, H. (author) / Speckter, H.E. (author)


    Publication date :

    1994


    Size :

    5 Seiten, 3 Bilder, 5 Tabellen, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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