Author :
Zhang, Y. ; Amin, M.G. ; Frazer, G.J.
Abstract :
A novel high-resolution time-frequency representation method is proposed for source detection and classification in over-the-horizon radar (OTHR) systems. A data-dependent kernel is applied in the ambiguity domain to capture the target signal components, which are then resolved using root-MUSIC based coherent spectrum estimation. This two-step procedure is particularly effective for analysing a multicomponent signal with time-varying complex time-Doppler signatures. By using the different time-Doppler signatures, important target manoeuvring information, which is difficult to extract using other linear and bilinear time-frequency representation methods, can be easily revealed using the proposed method
Keywords :
Doppler effect <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; interference suppression <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; radar clutter <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; radar detection <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; radar resolution <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; radiowave propagation <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; signal classification <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; signal representation <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; time-frequency analysis <manoeuvring target detect., over-the-horizon radars, high-resoln. time-freq. distribs.>; HF radiowave propagation; OTHR systems; ambiguity domain; bilinear time-frequency representation; clutter suppression; data-dependent kernel; high-frequency radiowave propagation; high-resolution time-frequency distributions; linear time-frequency representation; multicomponent signal; over-the-horizon radar; root-MUSIC based coherent spectrum estimation; source classification; source detection; target manoeuvring information; target signal components; time-varying complex time-Doppler signatures;
