Title :
Extraction of waveguide scattering features using joint time-frequency ISAR
Author :
Trintinalia, Luiz C. ; Ling, Hao
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
fDate :
1/1/1996 12:00:00 AM
Abstract :
A new joint time-frequency ISAR algorithm that combines the conventional ISAR processing with the joint time-frequency signal representation is presented. The adaptive spectrogram, applied to the range axis of the ISAR image, is used as the time-frequency processing engine. The algorithm is tested using the chamber measurement data from a scale model airplane. The results show that the nonpoint scattering mechanisms due to the waveguide-like engine inlet can be seamlessly removed, leading to an enhanced ISAR image consisting only of point scatterers. Furthermore, the extracted inlet features are displayed in the frequency-aspect plane and show distinct waveguide cutoff features
Keywords :
adaptive signal processing; image representation; radar imaging; synthetic aperture radar; time-frequency analysis; ISAR image range axis; adaptive spectrogram; chamber measurement data; frequency-aspect plane; joint time-frequency ISAR; joint time-frequency signal representation; nonpoint scattering mechanisms; scale model airplane; time-frequency ISAR algorithm; waveguide cutoff features; waveguide scattering features; waveguide-like engine inlet; Airplanes; Cutoff frequency; Data mining; Engines; Feature extraction; Scattering; Signal representations; Spectrogram; Testing; Time frequency analysis;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
