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Today, the phenomena of using internet network and multimedia application had increasing growth. Transformation and transmission of information or image over the network can be easily done by public. Therefore, security is an important issue in communication and storage of data; particularly images. Due on this issue, encryption is found to be one of the efficient ways to ensure security. Thus, this...
The precise beam pointing of Phased Array Antenna needs high consistency of each array channel. In the actual Phased Array Antenna system, the amplitude and phase of every array channel cannot be completely consistent; therefore, it needs real-time monitoring and array channel amplitude/phase error adjusting. This paper proposes an onboard method to measure the amplitude /phase error of every array...
We present a digital fully configurable architecture that performs the function of signal generation for emulation of radiation detectors and front-end. A novel algorithm is proposed that modulates the amplitude of the synthesized pulses generated by the system according to the source energy spectrum given as an input. Furthermore the same architecture is used to emulate the statistic time interval...
In this article we describe our effort to create, model, implement and simulate a quadrature linear digital modulator. It is to be used as a part of advanced radio transmission system. We describe the process of modeling the modulator in Matlab in both floating and fixed point arithmetic for later implementation in VHDL language for FPGA. We also describe the techniques we have used to implement the...
Restricted Boltzmann machines (RBMs)- the building block for newly popular deep belief networks (DBNs) - are a promising new tool for machine learning practitioners. However, future research in applications of DBNs is hampered by the considerable computation that training requires. In this paper, we describe a novel architecture and FPGA implementation that accelerates the training of general RBMs...
In this paper, we present a new structure to implement a switch-beam smart antenna system. The system is able to produce the beam with 6-degree beam-width and steer the beam from 0 to180 degrees in azimuth angle. The proposed system takes the advantage of integrated digital signal processing (DSP) and field programmable gate array (FPGA). In the system, the TI DSP performs digital beamforming and...
In this paper two section array and the arithmetic of DOA are studied on the eight elements array antennas and DOA arithmetic is designed on the FPGA. The directional characteristic of the line array and the elliptic array antenna is compared, proving that the line array and the circuit array can be consolidated in the elliptic array and deducting the uniform expression for array performance, forth...
This paper describes work carried out at QinetiQ to demonstrate real-time operation of space-time adaptive processing (RTSTAP) for airborne phased array radar, in a laboratory environment. RTSTAP processing is performed using field programmable gate array (FPGA) hardware and controlled via a MATLABcopy graphical user interface. The FPGA hardware is connected to the PACER (phased array concepts evaluation...
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