Passive ISAR Imaging Using Multi-channel DVB-T Signals

This paper analysis the characteristics and ambiguity function of the single-channel and multichannel DVB-T signals, and choose the multi-channel DVB-T signal as opportunity illuminators to do the research of ISAR imaging. Firstly, the target’s echo using single-in-multi-out mode for passive ISAR image is derived, together with the analysis of the composition of the echo’s spatial spectrum. Considering the characteristic of the imaging model, PR-CLEAN method is given, which uses the CLEAN algorithm to extract the scatters from every received echoes after the Polar Reformatting algorithm is processed. The PR-CLEAN method can get better performance for noise suppression which caused by the Polar Reformatting algorithm, and improve imaging quality. Simulation results agree well with the theoretical analysis, and PR-CLEAN method is proved to be a good method for ISAR imaging in single-in-multi-out mode based on the multi-channel DVB-T signals. Copyright © 2014 IFSA Publishing, S. L.