The near-Earth asteroid collisions could cause catastrophic disasters to humanity and the Earth,so it is crucial to monitor ***-based synthetic aperture radar(SAR)is an observation technique for high resolution imagin...
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The near-Earth asteroid collisions could cause catastrophic disasters to humanity and the Earth,so it is crucial to monitor ***-based synthetic aperture radar(SAR)is an observation technique for high resolution imaging of *** ground-based SAR requires a long integration time to achieve a large synthetic aperture,and the echo signal will be seriously affected by temporal-spatial variant *** spatiotemporal freezing tropospheric models are *** cope with this,this paper models and analyses the impacts of temporal-spatial variant troposphere on ground-based SAR imaging of *** the background tropo-sphere,a temporal-spatial variant ray tracing method is proposed to trace the 4D(3D spatial+temporal)refractive index network provided by the numerical weather model,and calculate the error of the background *** the tropospheric turbulence,the Andrew power spectral model is used in conjunction with multiphase screen theory,and varying errors are obtained by tracking the changing position of the pierce point on the phase *** simulation,the impact of temporal-spatial variant tropospheric errors on image quality is analyzed,and the simulation results show that the X-band echo signal is seriously affected by the troposphere and the echo signal must be compensated.
Obtaining Doppler center frequency parameters estimation (DCFPE) with low time consumption is a great challenge in synthetic aperture radar (SAR) imaging system. In order to get DCFPE in realtime, this paper adopts t...
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In this paper, an FPGA-based moving object detection and tracking system is introduced for image processing application. The algorithms presented include object detection based on dynamic background difference, kalman...
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ISBN:
(纸本)9781849199940
In this paper, an FPGA-based moving object detection and tracking system is introduced for image processing application. The algorithms presented include object detection based on dynamic background difference, kalman filter for object tracking. The target device for the implementation is a Xilinx Zynq-7000 FPGA. The use of ARM dual core processor, NEON vector coprocessor unit and coprocessing IP peripherals generated by vivado HLS aim to improve the data processing ability of the system. In the dynamic background, the system realized accurate detection and tracking of moving objects in real-time.
This paper concentrates on the hardware implementation of CORDIC algorithm for computing inverse trigonometric functions like arcsine and arccosine. We improve the existing algorithm by changing the initial rotating v...
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ISBN:
(纸本)9781849199940
This paper concentrates on the hardware implementation of CORDIC algorithm for computing inverse trigonometric functions like arcsine and arccosine. We improve the existing algorithm by changing the initial rotating vector of the iterations and modifying the judging condition of rotation direction. Due to the improvement, two iterations are saved and the drawback of the previous algorithm is corrected. In contrasting with the previous implementation, the improved algorithm consumes less hardware resources and its computing results are more accuracy.
With the rapid development of satellite-based signal processing technologies comes the widespread deployment of SAR image processing systems in spaceborne applications, many of which are implemented as FPGA-based syst...
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ISBN:
(纸本)9781849199940
With the rapid development of satellite-based signal processing technologies comes the widespread deployment of SAR image processing systems in spaceborne applications, many of which are implemented as FPGA-based systems thanks to the introduction of modern programmable devices with high capacity and complexity. However, as raw data of SAR satellites grow in size and bandwidth the effective implementation and especially the efficient system verification are emerging as the bottleneck in the development of FPGA-based SAR image processing systems. This paper proposes methods in the verification phase of FPGA-based SAR processing system development which on one hand increases the verification speed during simulations and on the other addresses the hardware/Matlab mismatch issue through comparison of floating point numbers on grounds of error analysis from a mathematical approach. Actual development process indicate that the proposed methods guarantee quick design convergence, and test results on real hardware confirm that the SAR image processing system offers acceptable quality of image output.
A novel approach is presented for change detection of very high resolution (VHR) remote sensing images in this paper, which is achieved by an improved watershed segmentation and mutual correlation. Specifically, the i...
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ISBN:
(纸本)9781849199940
A novel approach is presented for change detection of very high resolution (VHR) remote sensing images in this paper, which is achieved by an improved watershed segmentation and mutual correlation. Specifically, the input multitemporal images are watershed segmented separately in the first stage. And then fuse the segmentation regions of two segmented images, which is also a combination of object outlines in other words. Finally, the change mask can be acquired by the mutual correlation method. Experimental results show the superiority of the proposed method over the Markov random filed (MRF) method to the VHR urban optical remote sensing images.
With the development of the high-resolution synthetic aperture radar (SAR) technology, the spaceborne SAR has become a hot research topic. However there is a contradiction between hardware resource occupation and imag...
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Due to the existence of the large scale matrix transposition, the memory bandwidth becomes the bottleneck of the real-timeprocessing in spaceborne SAR imaging. The paper reports a preliminary study result of the memo...
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ISBN:
(纸本)9781849199940
Due to the existence of the large scale matrix transposition, the memory bandwidth becomes the bottleneck of the real-timeprocessing in spaceborne SAR imaging. The paper reports a preliminary study result of the memory architecture in the spaceborne SAR imaging system. It consists of algorithm summarizations, implementation difficulty discussions and processing requirement analysis. Then, a new memory architecture is being proposed to improve memory access efficiency and its implementation is specified. Finally, results of different methods are compared and imaging results validates the presented memory architecture.
This paper presents a method of the implementation of a verification platform. The platform is applied to an ASIC chip designed for the key algorithm of SAR signal processing. The design is a complicated process and t...
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ISBN:
(纸本)9781849199940
This paper presents a method of the implementation of a verification platform. The platform is applied to an ASIC chip designed for the key algorithm of SAR signal processing. The design is a complicated process and the chip function is computationally burdensome, thus the verification is difficult. Balancing the competing demands for efficiency, quality, time and cost, the verification platform is carefully designed using the Verilog language, with Synopsys VCS-MX2009 adopted. The experimental results show that the design errors of timing and anti-protocols have been exactly checked out and the verification coverage reaches 100% at last. The platform possesses satisfying characteristics such as high performance, fine configurability, flexibility and expansibility.
This paper proposes and implements the relative radiometric correction for remote sensing images based on Vivado HLS with FPGA. This design not only simplifies the development process, but successfully achieved the pu...
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ISBN:
(纸本)9781849199940
This paper proposes and implements the relative radiometric correction for remote sensing images based on Vivado HLS with FPGA. This design not only simplifies the development process, but successfully achieved the purpose of improving the image quality of remote sensing image. Firstly, this paper gives a brief analysis on the radiometric correction algorithm based on histogram matching correction, and then using C to complete the hardware development of FPGA by HLS. The results validate the feasibility of histogram correction based on HLS.
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