Abstract
This letter presents coherent and incoherent nonlinear apodization methods for bistatic synthetic aperture radar (SAR) imaging. The methods are developed on the principle of nonlinear apodization for monostatic SAR imaging and a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\omega \,\,-\,\,k$ </tex-math></inline-formula> relationship representing the bistatic region of support. This relationship plays an important role in designing 2-D windows for the apodization methods. The simulation results show that the presented apodization methods work efficiently with bistatic SAR imaging. In the experiment with a coherent dual apodization (CDA) method presented in this letter, the sidelobe attenuates very fast, and the peak sidelobe is reduced about 16 dB, while the resolutions in azimuth and range are maintained.
Highlights
B ISTATIC synthetic aperture radar (SAR) refers to SAR systems with separated transmitter and receiver
We present coherent and incoherent nonlinear apodization methods for bistatic SAR imaging based on the principle of nonlinear apodization for monostatic SAR imaging and the bistatic ω − k relationship derived in [8]
We provide some simulation results to examine the performance of the proposed nonlinear apodization for bistatic SAR imaging
Summary
B ISTATIC synthetic aperture radar (SAR) refers to SAR systems with separated transmitter and receiver This separation brings a number of advantages for bistatic SAR in vulnerability reduction, object classification, jamming resistance, and so forth. It is common knowledge that linear apodization refers to the sidelobe control methods that weigh the region of support of an SAR image, i.e., the 2-D Fourier transform of SAR image, with windows, such as Hamming, Hanning, and Blackman. A new bistatic ω − k relationship has been introduced recently in [8] opening the opportunities to develop the apodization methods for controlling sidelobe in bistatic SAR imaging. We present coherent and incoherent nonlinear apodization methods for bistatic SAR imaging based on the principle of nonlinear apodization for monostatic SAR imaging and the bistatic ω − k relationship derived in [8].
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