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A computation method for effective path of SAR double bounce scattering from trees and undulating terrain is presented. The large-scale elements of surface fitting are used to describe the variation of surface slope. The situation that there may be none or many effective paths of double bounce scattering from trees when the terrain is undulating with large-scale feature is fully considered through...
Synthetic aperture radar (SAR) simulation of 3-D forest canopies is a powerful tool for studying the interaction between radar and forest, for testing new applications, and for devising inversion algorithms of forest structures. SAR raw-signal generation is frequently used in point-target simulation but is rarely used in 3-D forest simulation. The existing simulators directly produce SAR images based...
This paper presents a fidelity SAR simulator for forest region considering raw echoes generation and image focusing process with various kinds of uncertain factors including trajectory deviations, attitude dithering, calibration error, noises. Moreover, a rapid method is also developed to reduce the time cost of raw signal generation for three-dimensional forest canopies. The simulator is verified...
The global positioning system (GPS) has been considered as new roles in estimating geophysical parameters of ocean and terrene. The measurement technique is called Space-Surface Bistatic Synthetic Aperture Radar (SSBSAR) system with navigation satellite. In traditional Bistatic SAR (BSAR), the time delay of reflected signal is generated by the shift of transmitted signal copy, and the phase delay...
Forest height is one of the important ecological elements and its estimation has been developed recent years. Forest height estimation is usually obtained through the scattering centers between canopy and ground using Pol-InSAR data. There are three classes of method for forest height estimation, phase-difference between interferograms, coherence optimization based on coherent / incoherent scattering...
Synthetic Aperture Radar (SAR) has been proved as an effective instrument for detecting vertical structures of forest canopies. However, the quality of SAR images could decline because of phase errors caused by the residual motion deviations after motion compensation or autofocus process. Then, the accuracy of forest height inversion will be affected. In this paper, the relationship between residual...
Synthetic Aperture Radar (SAR) simulation of forest region is a powerful tool for understanding the mechanism of remote sensing, testing new applications and devising inversion algorithms of forest structure. The common approaches used to simulate images of forest region are lack of the ability to be faithful to the actual characteristics of the remote sensing systems. This paper presents a fidelity...
A novel simulation method of ground clutter for airborne pulse Doppler (PD) radars is proposed. The method is based on synthetic aperture radar (SAR) image and Fast Fourier Transform (FFT) operation aiming at efficient simulation of time-domain signal with natural scene. It is applicable only to distributed ground clutter. In this method, the backscatter coefficient is obtained from SAR image data...
SAR simulation for forest application has been proved as an effective tool to provide scattering models and simulated SAR data for the research of forest retrieval algorithms. The common method of SAR simulation is combining the scattering coefficients with the ideal Point Spread Function to generate images directly without echo generation. However, when there are non-ideal factors in remote sensing...
SAR system simulation for forest application has been proved as an effective tool to provide scattering models and simulated SAR data for the development of forest retrieval algorithms. With the development of high resolution synthetic aperture radar (SAR) remote sensing technology, the demands of precise and efficient simulation for large-scale forest applications become increasing. However, the...
Interference fringes will be generated in SAR image when distributed targets' echo signal is simulated because of the uniform model of targets. The fringes can be suppressed by adding random height in space or random phase on backscatter coefficient of the distributed targets. However, the former method will introduce location error and the latter method will increase speckle noise twice in simulated...
Interference fringes will be generated in SAR image when distributed targets' echo data is simulated due to the uniform model of targets. The location and width of the fringes are related to the wavelength of signal, the incident angle of wave beam and the interval between adjacent targets. Further analysis about the influencing factors of the interference fringes is given in this paper and a suppression...
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