Research on Classification Technology of Phase-Coding Signal Modulation Under Different IF Bandwidth Filtration

Automatic classification of intra-pulse modulation features is an important part of radar signal analysis. For analysis to intra-pulse modulation, automatic classification of intra-pulse modulation is usually conducted based on frequency conversion and filtration to received radar signal. The classification method for intra-pulse modulation based on phase difference can achieve accurate classification under wide-band IF filtration. But under narrow band IF filtration, (50MHz/10MHz), IF filtration may lead to phase deterioration of target signal. This paper proposes a modulation classification method of phase-coding signal based on accumulated difference so as to classify the unmodulated signal, bi-phase signal and quadri-phase signal. Validated by simulation, that method can achieve over 85% accuracy for classification of phase-coding modulation signal. The proposed method is validated to be feasible in engineering by practical test.