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In this paper, an efficient approach, named unitary matrix pencil method, is presented for pattern synthesis of sparse linear arrays. An equivalent real-valued matrix pencil can be achieved to determine the relation between element positions and new generalized eigenvalues through using the unitary transformation for the Hankel matrix with the sampled pattern data. The proposed method increases up...
Terahertz (THz) radar has developed a lot in recent years. Its ability for near field security inspection becomes a popular research topic. However, the phase errors caused by THz radar's motion are difficult to compensate due to the submillimeter wavelength, which means a tiny motion error will bring a huge phase deviation. In this paper, we report a crossed array radar imaging method, which employs...
A novel wideband high efficiency filtantenna array for space-borne synthetic aperture radar (SAR) applications is presented. The antenna array operating bandwidth is broadened by subarray technology, in which the subarrays are excited by a ridged waveguide divider. In order to eliminate the data transmission interference on SAR, the evanescent mode waveguide filters are integrated in the divider expediently...
An element failure diagnosis method for phased array antenna is proposed. The method is based on the matrix method by solving inverse matrix to retrieve the excitations of the antenna under test. Taking advantages of the phase shift of the excitation, the receiving probe can be fixed during the measurement process to reduce positioning errors. The results have good accuracy to identify the locations...
High Efficiency Video Coding (HEVC), a modern video compression standard, exceeds the predecessor H.264 in efficiency by 50%, but with cost of increased complexity. It is one of main research topics for FPGA engineers working on image compression algorithms. On the other hand high-level synthesis tools after few years of lower interest from the industry and academic research, started to gain more...
Correlation clustering is a NP-hard problem, and for large graphs finding even just a good approximation of the optimal solution is a hard task. In previous articles we have suggested a contraction method and its divide and conquer variant. In this article we present several improvements of this method (preprocessing, quasi-parallelism, etc.) and prepare it for parallelism. Based on speed tests we...
The far field pattern from a non-uniformly spaced antenna array is computed using a least squares method. The method originally developed for spectral estimation for a non-uniformly spaced finite data set is applied for the analysis of the far field pattern from unevenly spaced antennas, as the far field pattern is due to the spectrum of the location of the antenna elements. The advantage of using...
The development of the Internet functions now affects many activities, talks, meetings, shopping, and learnings. E-Learning is part of the development models of learning that utilizes the internet. The current development model of online learning still needs support and new innovations. Politeknk Elektronika Negeri Surabaya (PENS) has an online learning application that uses the Moodle LMS. However,...
Array antenna has been utilized in many radio telescope systems, especially for low frequency transient observation, to increase their resolving power. In this paper, a new method to determine the maximum resolving power of an array radio telescope based on the single antenna beamwidth is proposed. The method is derived from theoretical calculations combined with simulations. Statistical result shows...
In this paper, we describe an FPGA system for the real-time processing of Poisson image Editing. Poisson Image Editing is a powerful method to overlay an image on another image seamlessly. In this method, however, a simple equation is repeatedly applied to each pixel, and this repetition makes its computational complexity very high. In our system, a very deep pipeline is used to apply the equation...
High-level synthesis (HLS) is well capable of generating control and computation circuits for FPGA accelerators, but still requires sufficient human effort to tackle the challenge of memory and communication bottlenecks. One important approach for improving data locality is to apply loop tiling on memory-intensive loops. Loop tiling is a well-known compiler technique that partitions the iteration...
The method of Graph Cuts converts a Maximum a Posteriori (MAP) inference problem on a Markov Random Field (MRF) into a network flow, which can be solved efficiently. Many computer vision problems can be conveniently cast as an inference task to find most likely labels for pixels. The method is widely used, but computationally burdensome. Prior accelerator attempts have failed to exploit the problem's...
Variable Pipeline Cool Mega Array (VPCMA) is an low power Coarse Grained Reconfigurable Architecture (CGRA) based on the concept of CMA (Cool Mega Array). It implements a pipeline structure that can be configured depending on performance requirements, and the silicon on thin buried oxide (SOTB) technology that allows to control its body bias voltage to balance performance and leakage power. In this...
FPGA-based neural-networks typically leave performance on the table because the DSP resources run at less than a third of the peak clock rate. This paper presents a processing array architected to consistently achieve timing closure at 100% of the peak DSP clock rate with standard FPGA tools. In the HDL design environment, our processing array operates at the peak DSP clock rates on Xilinx UltraScale...
Accelerated clusters, which are distributed memory systems equipped with accelerators, have been used in various fields. For accelerated clusters, programmers often implement their applications by a combination of MPI and CUDA (MPI+CUDA). However, the approach faces programming complexity issues. This paper introduces the XcalableACC (XACC) language, which is a hybrid model of XcalableMP (XMP) and...
A heterogeneous memory system (HMS) consists of multiple memory components with different properties. GPU is a representative architecture with HMS. It is challenging to decide optimal placement of data objects on HMS because of the large exploration space and complicated memory hierarchy on HMS. In this paper, we introduce performance modeling techniques to predict performance of various data placements...
In cloud storage systems, the use of erasure coding results in high read latency and long recovery time when drive or node failure happens. In this paper, we design a parity independent array codes (PIT), a variation of STAR code, which is triple fault tolerant and nearly space-optimal, and also propose an efficient single-failure recovery scheme (PITR) for them to mitigate the problem. In addition,...
This paper presents our study on a sparse antenna array for 0.22 THz imaging. Based on the effective aperture concept for the design of sparse antenna array, two schemes for high performance THz imaging of a target at distance of 1 m have been achieved in simulation. Then, different schemes of larger array element spacing and mechanical scanning spacing have been investigated to build the relationship...
In this paper, it is illustrated how to carry out adaptive processing simultaneously at multiple frequencies using the same antenna array consisting of dissimilar antenna elements nonuniformly spaced and deployed above an imperfect ground plane. First, an electromagnetic transformation technique is described which can compensate for all non-ideal effects of an antenna array deployed in a real environment,...
With the advent of the new class of radio telescopes as for example the LOw Frequency ARray (LOFAR) and the Square Kilometer Array (SKA) the necessity of using data mining procedures to handle the huge amount of data collected during their observations became crucial. Software design has resulted in a complete shift of methods by which information is collected in the radio frequency domain. Pointing...
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