| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: phase synchronisation of a narrowband signal is based on sampling thereof on zero crossing, conversion to a binary code and comparison with one of normalised biorthogonal sequences by integration and summation, wherein the binary code undergoes Boolean transformation over Galois field GF(2), conjugate pair Boolean transformation coefficients are multiplied, subjected to unitary Boolean transformation and, using fast Walsh transformation by Pontryagin maximum method on a threshold level, the number of one of the biorthogonal sequences which coincides with the number of a narrowband filter, independent of phase, is found. The apparatus includes an amplifier with a sampler, a random-access memory unit, a unit for Boolean transformation over Galois field GF(2), a fast Walsh transformation unit, and additionally a unitary Boolean transformation unit, the inputs of which are connected to outputs of multipliers, and the output is connected to the input of the fast Walsh transformation unit.EFFECT: high noise-immunity of real-time narrowband filtration.1 dwg, 7 tbl |
