Poor data locality in high-speed networks leads to more memory accesses of connection management, which limits the throughput performance. In view of the above problem, this paper analyzed the process of connection ma...
详细信息
Poor data locality in high-speed networks leads to more memory accesses of connection management, which limits the throughput performance. In view of the above problem, this paper analyzed the process of connection management and access in detail, and put forward the efficient connection management solution to improve throughput on FPGA platform. This solution takes full advantage of the structural characteristics of SDRAM. By controlling access requests, it can make adjacent access requests access different banks, which can reduce hardware resource conflicts, shorten the time interval between access requests and improve throughput. In order to reduce the complexity of control, we selected multiple slots hash table as the data structure for connection management. Simulation results show that this solution shorten the time interval by about 71.4%.
The spatial correlation of target echoes is important to jointly process signals received at each radar substation in distributed radar system. On the background of space surveillance with two independent monostatic r...
详细信息
ISBN:
(纸本)9781510822023
The spatial correlation of target echoes is important to jointly process signals received at each radar substation in distributed radar system. On the background of space surveillance with two independent monostatic radars, a three-dimensional cylinder target scattering model and echo signal model are built combined the orbital motion. The echoes spatial correlation is analysed and correlation coefficient which varies with the included angle between two radars and target is derived. The reasonableness of target scattering model and validity of theoretical analysis are proved via simulation examples.
This paper presents two algorithms to recover LDPC codes in an error-free environment. Both algorithms reconstruct the sparse parity-check matrices of LDPC codes based on elementary row transformation, and are equival...
详细信息
This paper presents two algorithms to recover LDPC codes in an error-free environment. Both algorithms reconstruct the sparse parity-check matrices of LDPC codes based on elementary row transformation, and are equivalent to recognize LDPC codes. The first one is appropriate to the LDPC codes whose parity-check matrices have the double-diagonal structure; the second one is a general algorithm that ensures the second-best solution for every type of LDPC codes. Simulation results show that, these algorithms work well with most of LDPC standards and protocols, including 802.16e, 802.11n, DVB-S2 GJB7296 and GB20600.
Extraction of features and subsequent classification of ground moving targets, especially humans and vehicles, are topics of great relevance for the theoretical research and practical application in the signal process...
详细信息
ISBN:
(纸本)9781467372985
Extraction of features and subsequent classification of ground moving targets, especially humans and vehicles, are topics of great relevance for the theoretical research and practical application in the signalprocessing of the ground surveillance radar. Based on time-frequency (TF) spectrograms, a novel method for the feature extraction of micro-motion targets is proposed in this paper. The experimental results under different signal-to-noise ratio (SNR) and training sample number conditions verify the validity and robustness of the proposed method.
A novel multi-targets ISAR imaging method based on particle swarm optimization (PSO) and modified CLEAN technique is proposed in this paper. First, multi-targets are modeled as several separated group-targets in which...
详细信息
ISBN:
(纸本)9781467372985
A novel multi-targets ISAR imaging method based on particle swarm optimization (PSO) and modified CLEAN technique is proposed in this paper. First, multi-targets are modeled as several separated group-targets in which translational motion of each target is analogous. And then, translational motion of each group-target is modeled as a polynomial, and the polynomial coefficient is estimated via PSO. Then focused image of the group-target can be obtained and extracted via a modified CLEAN technique. Meanwhile, each target can be segmented and extracted based on clustering number estimation and K-means clustering algorithm. Finally, better focused image of each target would be obtained through further traditional mono-target imaging processing. Experimental results verify the validity of the proposed method.
Range migration is the basic and troublesome problem in moving target detection for wideband radar. In this paper, we propose a joint-sparse estimation algorithm that gives a sparse representation of migration targets...
详细信息
ISBN:
(纸本)9781479982332
Range migration is the basic and troublesome problem in moving target detection for wideband radar. In this paper, we propose a joint-sparse estimation algorithm that gives a sparse representation of migration targets with velocity ambiguity. The proposed algorithm utilizes a non-ambiguous representation of the wideband signals to alleviate the velocity ambiguity, then the estimation of the targets scenario is achieved by joint-sparse recovery. Numerical results are presented to demonstrate the effectiveness of the proposed algorithm in case of a multi-target scenario.
A numerical performance analysis method with real space objects' TLE data to evaluate the detection performance of space-based radar is delivered. Firstly, two radar models are built in Satellite Tool Kit (STK) to...
详细信息
This paper presents a new intelligent proportional control(i Ps) for trajectory tracking of nonlinear affine-in control systems with unknown internal *** referred proposed controller which is based on an ultra-local m...
详细信息
This paper presents a new intelligent proportional control(i Ps) for trajectory tracking of nonlinear affine-in control systems with unknown internal *** referred proposed controller which is based on an ultra-local model and a time-delay estimation technique has a very simple structure and easily to be *** with the systems output feedback,the proposed controller dose not require any knowledge of nonlinear internal dynamics ensuring the trajectory tracking of systems ***,to validate the proposed method,a nonlinear cart system which includes different kind of frictions have been considered to compare with different model free controls of time delay estimation based control(TDEC) and recursive model free control(RMFC),and illustrates its corresponding performance and robustness.
Dimensionality reduction motivated by manifold leaning has been an active research domain in the past few years because of its capability of discovering the essential structure of the data. In contrast to Neighborhood...
详细信息
In practice, the ambiguous image of the strong ground clutter may dominate in the adjacent water areas in the case of high-azimuth ambiguity level for the spaceborne synthetic aperture radar. In this letter, a robust ...
详细信息
暂无评论