Resampling methods for stretch processing in PCL radars

摘要

The paper presents a study of effective resampling techniques to be used for stretch processing in Passive Coherent Location radars. In a typical PCL radar, two signals are correlated: one coming from a reference antenna pointed at a transmitter of opportunity, other coming from a search antenna pointed at the observed area, seeking the reflection of radio signal from a target. If the second antenna receives an echo from a moving target, the correlation of the two signals is disturbed by Doppler effect, consisting of frequency shift and envelope dilation. In order to compensate for this second effect, the reference signal has to be stretched (or dilated) by resampling. In the paper the review of applicable resampling methods is performed. The useful method should give results good enough for the correlation process, and it has to be very fast in the implementation, as the processing is to be done in real time.