Abstract
A novel method is proposed for azimuth sidelobes suppression using multi-pass squinted (MPS) synthetic aperture radar (SAR) data. For MPS SAR, the radar observes the scene with different squint angles and heights on each pass. The MPS SAR mode acquisition geometry is given first. Then, 2D signals are focused and the images are registered to the master image. Based on the new signal model, elevation processing and incoherent addition are introduced in detail, which are the main parts for azimuth sidelobes suppression. Moreover, parameter design criteria in incoherent addition are derived for the best performance. With the proposed parameter optimization step, the new method has a prominent azimuth sidelobes suppression effect with a slightly better azimuth resolution, as verified by experimental results on both simulated point targets and TerraSAR-X data.
Highlights
For many applications of synthetic aperture radar (SAR), the images can be adversely affected by sidelobes, especially in the case of strongly scattering targets with weak targets nearby, such as in a harbour with ships and containers
Parameter optimization of elevation integrated range, the performance of the azimuth sidelobes. Unlike tomography, in this mode the azimuth sidelobes occur at different elevations and can suppression can be better, which is firstly introduced based on multi-pass squinted (MPS) SAR mode
Www.mdpi.com/journal/sensors where σP is the radar cross-section (RCS) of P, λ is wavelength, ρa and ρr represent azimuth and range resolution, respectively, r0 and y0 are the variables associated with the range and azimuth position of the focused image, v is the velocity of the SAR, and fd,n is the Doppler centroid frequency of the nth acquisition:
Summary
For many applications of synthetic aperture radar (SAR), the images can be adversely affected by sidelobes, especially in the case of strongly scattering targets with weak targets nearby, such as in a harbour with ships and containers. Through the parameter optimization of elevation integrated range, the performance of the azimuth sidelobes suppression can be better, which isSensors firstly2019, introduced based on MPS SAR mode. Unlike tomography, in this mode the azimuth sidelobes occur at different elevations and can suppression can be better, which is firstly introduced based on MPS SAR mode. Simulations with point targets and real SAR images are performed to test the proposed method in the nth pass, 2Nconclusions.
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