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According to the characteristic of large space manipulator, an on-board real-time singularity detection design is proposed. On the basis of forward and inverse kinematics calculation, the forward and inverse power method is applied to obtain the singularity by iterative computation. Firstly, the 7-DOF manipulator kinematics model is described and analyzed, and the main computational process is presented;...
With the rapid development of computer and network technology, micro-blog system provides to exchange information and proceed social life. It provides very favorable ways. Especially, how to quickly obtain information and release information, sharing of information in today's society become a research direction for a big data. In this paper, we based on Struts2, JSP, MySql, Ajax and JQuery related...
With the development of Internet technology, Internet security issues become increasingly prominent. People transfer a large amount of digital images on the Internet every day, in order to protect the security of the digital image, the most direct and effective way is to encrypt the digital image. Chaotic encryption system with natural characteristics, chaotic image encryption can effectively protect...
In this demonstration, we develop a moving object extraction and classification system based on a heterogeneous acceleration platform that consists of a local Zynq terminal and FPGA clusters on the IBM SuperVessel cloud. Extraction of the moving object from the streaming video input is offloaded to the Zynq terminal, while the classification is executed on the cloud. FPGA high level synthesis and...
A on-board ship targets detection method based on multi-scale salience enhancement is proposed. Unlike the traditional wavelet filter enhancement methods, the proposed utilizes the wavelet decomposition to obtain the high-low frequency parts, and estimate the salience feature with both parts, which enhance the ship targets efficiently. First, decompose the remote sensing image by 2-D DWT, and obtain...
Detection of ship targets in the sea area is an important field in remote sensing image target detection. As the ships and the surrounding areas are very different in texture, that makes it a possible solution to detect the ships using the texture feature. Aiming at the detection of ship targets, a novel ship target detection algorithm in a large scene of the optical remote sensing image is proposed...
According to the requirement of the navigation satellite in orbit power, limited hardware resources and the high real-time of spread spectrum communication, an efficient FFT based fast correlation detection design of high efficiency onboard is proposed. First, the navigation satellite spread spectrum signal acquisition is described, the existing methods are analyzed which require a lot of hardware...
A conflict-free architecture for multi-butterfly parallel processing in-place radix-r fast Fourier transform (FFT) is proposed. The parallel FFT computing principle for any radix-r is deduced, and the number of data points and butterfly units could be the any integer power of r. The method works for FFT data paths with pipeline data stream and multiple dual-port memory banks for parallel access. By...
Optical remote sensing satellite holds great potential for ship detection. However, it is challenging for real-time detection due to the relatively low resolution and complicated background. We propose a real-time on-board ship detection method based on statistical analysis and shape identification. First, Gaussian and median filter are used to reduce the periodical and pepper noise generated by the...
Software Defined Networking (SDN) uses a logically centralized controller to replace the distributed control plane in a traditional network. One of the central challenges faced by the SDN paradigm is the scalability of the logical controller. As a network grows in size, the computational and communication demand faced by a controller may soon exceed the capabilities of a commodity server. In this...
A two-dimensional temporal and spatial correlated lognormal clutter sequence generation method based on FPGA is proposed. This method solves the problem of long generation time generating the sequence based on the DSP, due to the higher sampling rates or long data, which is difficult to meet real-time requirements of the data generated‥ In this paper, based on FPGA, using a one-dimensional temporal...
Currently software defined radio (SDR) is implemented by using DSP only or by using DSP plus FPGA chip. For DSP processing speed of the bottleneck problem, a complete FPGA IF software radio implementation is proposed in this paper. Traditional solutions use only FPGA for digital up and down conversion, modulation and demodulation; design proposed in this paper based on the FPGA chip, a CPU processor...
The terahertz windows of 5 meter Dome A Terahertz Explorer (DATE5) are primarily over the wavelengths between 350 and 200 µm. For studying the performance of the DATE5, based on a finite element model of the whole telescope assembly, the deformations of the telescope under gravity load at different pointing are calculated. The obtained results show the ranges of surface RMS errors is in [2.59 µm,...
Dome A 5m Terahertz Explorer (DATE5) is a proposed telescope to be deployed at Dome A, Antarctica to explore the excellent terahertz observation condition unique to the site. The telescope needs to realize and maintain an overall reflector surface accuracy of 10 microns rms and a blind pointing accuracy of 2 arcseconds under the extreme site conditions and unmanned operating mode. Two candidate antenna...
An effective method is proposed for calculating the on-board real-time path planning of large-scale space redundant manipulators. Firstly, the 7-DOF manipulator kinematics model is described and analyzed, and the main computational process of path planning is presented. The homogeneous transformation matrices of various degrees of freedom are obtained through the telemetry joint angle, and is used...
The missile in flight with a non-linear, coupled and time-varying, in addition, the flight parameters have rapid changed, the traditional PID control can not meet the requirements of dynamic control. Aiming at this problems, in this paper put forward a kind of effective method to control missile attitude, improve the controllability of the missile control system. As missile pitch channel for an example,...
In North China, Tertiary sediments give the main oil-genetic series. The mean value of terrestrial heat flow density has been considered to be 60 – 65 mW/m2, and the geothermal gradient in Tertiary sediments usually ranges from 30 to 40° C/km in the region studied. Supposing that the onset of oil generation lies at about 90° C, the upper limit of the depth of oil-generation is at about 2000 to 2500...
In this paper, a novel high-gain two-port power converter with fuel cell (FC) and battery sources and stacked output for hybrid electric vehicle (EV) connected to dc-microgrid is proposed. In the proposed power converter, the loads power can be flexibly distributed between input sources. Also, charging or discharging of battery storage device by FC source can be controlled properly. The proposed converter...
The evolution of antidepressants over the past four decades has involved the replacement of drugswith a multiplicity of effects (e.g., TCAs) by those with selective actions (i.e., SSRIs). This strategywas employed to reduce the adverse effects of TCAs, largely by eliminating interactions with certain neurotransmittersor receptors. Although these more selective compounds may be better tolerated by...
The terahertz windows of the 5 meter Dome A Terahertz Explorer (DATE5) are primarily over the wavelengths between 350 and 200 μm. For studying the performance of the DATE5, based on a finite element model of the whole telescope assembly, the Eigen frequencies and Eigen modes of the DATE5 structure at different elevation angles are studied. The obtained results show the ranges of first 3 Eigen frequencies...
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