Abstract：Induction mechanism, extraction methods and classification efficiency of Jet En-gine Modulation (JEM) signatures in the aircraft returns of the conventional radar are studied in this paper. Firstly, induction mechanism of JEM signatures in the aircraft returns of the con-ventional radar is analyzed theoretically, and some differences of JEM signatures in the returns from different aircrafts including helicopter, propeller and turbojet are compared. Secondly, advantages and disadvantages of the analysis and extraction of JEM signatures are discussed in the time-domain, frequency-domain and time-frequency domain. Thirdly, a target classification and identification test is accomplished by using JEM periodic feature extracted by AR bispec-trum slice. The experimented results demonstrate that in target classification JEM periodic feature is effective but limited in the conventional radar.
2003, Vol. 25 
