Bistatic SAR Raw Data Simulation for Ocean
Bistatic SAR is a potential and effective tool for ocean remote sensing, and the simulation of bistatic SAR raw data from ocean surface plays a great role in the understanding of the mechanism of bistastic SAR ocean surface imaging. In this paper, a bistaitc SAR raw data simulation model for ocean surface is presented, which includes bistatic scattering simulation and ocean echo data simulation. In our research, based on IEM scattering model, a stochastic multiscale scattering model is improved by applying the second order nonlinear modulation model, and the speckle noise and coherent time character of ocean surface are simulated in the SAR raw data simulation.
Study on bistatic SAR ocean wave imaging mechanism
In order to develop bistatic SAR ocean investigation, the first issue is the study of bistatic SAR ocean surface imaging mechanism. And velocity bunching mechanism is a SAR inherent modulation. Thus, the intensity expression in the bistatic SAR image plane is derived in this paper. The expression describes quantificationally the displacement of the scatter elements in the image plane and a degradation in radar resolution in azimuthal direction. In addition, a bistatic SAR linear velocity bunching transfer function is obtained in the linear parameter regime. Finally, this paper analyzes qualitatively the effects that various platform observation conditions have on the bistatic SAR linear imaging range of wave spectrum.
Predictive Interpolation for Registration
Predictive interpolation is a new registration method that uses the bilinear interpolation equation to predict the pixel values of one image from those in another. The method requires that the images already be registered to the nearest pixel, which is not a serious limitation since hierarchical methods may be used to perform the initial registration. Registration accuracy of better than 5% of the width of a pixel can be expected between pairs of images, and this may be improved significantly if multiple images are to be registered to one another.