Abstract
A numerical electromagnetic method based on the physical optics with physical optics method (PO-PO) is employed to calculate backscattered returns from a missile-like target above sea surface. Surfaces are time-varying Monte Carlo simulations initialized as realizations of a Pierson–Moskowitz spectrum. The monostatic normalized radar cross section of composite model by the hybrid PO-PO method is calculated and compared with those by the conventional method of moments, as well as the runtime and memory requirements. The results are found to be in good agreement. The runtime shows that the hybrid PO-PO method enables large-scale time-varying Monte Carlo simulations. The numerical simulations of the Doppler spectrum from the fast-moving target above time-varying lossy dielectric sea surface are obtained, and the Doppler spectra of backscattered signals from this model are discussed for different incident angles, speed of flying target, wind speeds, incident frequencies, and target altitudes in detail. Finally, the coupling effects on Doppler spectra are analyzed. All the results are obtained at the incidence of horizontal polarization wave in this study.
Highlights
Doppler spectra are important in many fields ranging from target detection over sea surface, remote sensing at sea, and extraction of wave parameters from simulated and measured radar sea echoes [1,2,3]
We found that, with the further increase of incident angle, the contribution of mutual coupling scattering to the total Doppler spectra increased, and even the 2ndorder scattering became dominant to the total Doppler spectrum at low grazing angles
A numerical electromagnetic method based on physical optics with physical optics method (PO-PO) was used to calculate Doppler spectra from a missilelike target above the sea surface
Summary
Doppler spectra are important in many fields ranging from target detection over sea surface, remote sensing at sea, and extraction of wave parameters from simulated and measured radar sea echoes [1,2,3]. With the development of computational electromagnetics, many EM methods, including numerical and analytical methods, have been proposed to calculate the scattering from time-varying rough sea surface and targets in rough sea surface backgrounds. Qi et al [7] employed a hybrid iterative method that combined KA and MLFMA to solve the EM backscattering from rough sea surface and targets. The iterative method seemed to be the most appropriate in dealing with the large memory requirement and large runtime Doppler spectral simulation problems, because the iterative method allows EM scattering calculation from the target and sea surface. The numerical simulations of the Doppler spectrum from the PEC fast-moving missilelike target above time-varying lossy dielectric sea surface were obtained, and the Doppler spectra of backscattered signals from such simulations were discussed from different incident angles, frequencies, and target altitudes in detail. All fields and currents were assumed to have a time-harmonic dependence of the form e−iωt, and the horizontally (y-direction) polarized (TE) wave incidence (Eiy) is discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
