| 摘要 |
<p>The invention is related to a detection method and apparatus for transmission of data in a power transmission network operated at a power system fundamental frequency FE with a corresponding period duration lambda E. According to said method data is transmitted as symbols, each symbol having a duration of lambda D, as necessary the data is converted into serial-format digital values for detection, whereby the harmonic disturbance components Fh of the power system fundamental frequency are converted into baseband disturbance signal components Fh' having a period duration of lambda h', and said serial-format data is comprised of a sequence of N temporally successive symbols (B1-Bn). According to the invention, the symbol duration lambda D is selected in such a manner that the single-period duration lambda h' of the lowest-frequency disturbance signal component Fh min in the baseband is equal to an integer multiple of a single-symbol duration lambda D (N. lambda D = lambda h min ), at least the value of the first symbol (B1) in the data sequence is determined a priori, subsequently recursive integrations are performed over the duration of the successive symbols (Bi, Bi+1) of the data sequence included in at least one period duration lambda h min of the disturbance signal component so that each unknown symbol (B2-Bn) of the data sequence in turn becomes the last symbol (Bi+1) in the integration, and on the basis of final result from the integration and the value of at least one temporally preceding symbol (Bi), the value of each symbol (B2-Bn) successive thereto is determined. <IMAGE></p> |
