Scaled Radon-Wigner Transform Imaging and Scaling of Maneuvering Target

The use of scaled Radon-Wigner transform (RWT) imaging and simultaneous cross-range scaling is proposed for a maneuvering target using a signal model of a rotating target with uniform acceleration. Three steps are needed to realize such a process. First, the rotational parameters are calculated via the weighted linear least squares method after obtaining frequency modulation parameters of signals in multirange cells. Second, rotational parameters are used to compensate for the slow-time signals. Third, inverse synthetic aperture radar imaging of scaled RWT is implemented with cross-range scaling. Parameter substitution changes every component signal from a slanting line to a horizontal line in the time-frequency plane, and the horizontal line integral can be expressed as a cross-range profile. Compared with conventional RWT imaging methods, this algorithm improves calculation speed greatly and provides more stable imaging performance. This method was tested successfully with simulated and experimental radar data.