Cochannel Interference in DTMB-Based Passive Radar

Abstract

This paper discusses the situation with cochannel interferences in the digital television terrestrial multimedia broadcasting (DTMB)-based passive radars. The cochannel interference comes from the station that works in the same frequency with the adopted illuminator of opportunity (IO), but broadcasts different contents. Based on the frame structure of the DTMB signal, the features of the cochannel interference are elaborated. Analyses show that several interfering peaks present in the range-Doppler map when the cochannel interference has the same frame header with the IO. These interfering peaks can be used to identify the existence of cochannel interferences. In addition, to eliminate the influences of the cochannel interference on the target detection, we propose a method that can effectively remove the interfering peaks. The simulation and field experimental results verify the effectiveness of the proposed method.