Spectrum reconstruction in the sky-wave OTHR using GAPES

The performance of a sky-wave over-the-horizon radar (OTHR) is severely degraded by the transient interference such as lighting and radio-frequency interference (RFI). After interference excision, the target detection performance is mainly determined by the performance of Doppler spectrum reconstruction. In this paper, instead of the regular linear prediction interpolation method, the gapped-data amplitude and phase estimation (GAPES) method is used for the Doppler spectrum reconstruction. The experimental results show that it is an effective way to achieve spectrum reconstruction.