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A synthetic aperture sonar gathers echoes from large area of seafloor per a ping, therefore the sonar needs wider width of the beam than Side scan sonar. But if the elements of the projector is just one element, it have to be small to widen the beam, and must be low sensitivity. One solutions to raise the sensitivity of the sonar is to use array as a receiver. The array is not only necessary for high...
This article presents a method of steganographic keys generation for case of embedding many secrets in single container. The most important requirements of proposed algorithm are as follows. The generated keys cannot overlap what means that the positions they indicate in the cover have to be different. An authorized user with known key should be able to easily retrieve any secret from carrier file...
The paper presents a method of reducing the matrix that keeps the distance which went ultrasound and an data processing algorithm for the phased array system using MatLab. Cut of the control object for the phased array containing of 16 sensors is presented. Also The paper presents an example of practical realization of the algorithm on an FPGA using the program Quartus II.
We consider the problem of estimating the singular vectors of low-rank signal matrices buried in noise in the setting where the singular vectors are assumed to be Kronecker products of three unknown vectors. We propose several algorithms for estimating such singular vectors, which explicitly exploit the Kronecker structure of the underlying vectors. We demonstrate improved estimation accuracy and...
A bilaminate three element array of transducer has been designed and fabricated with corona poled polyvinylidene fluoride (PVF2) using a printed circuit board (PCB) backing. The results obtained with this array show a flat frequency response over a wide bandwidth, short pulse width and adequate sensitivity for possible application in medical imaging.
This paper presents an accurate source number detection method for low-cost array system based on nested array and Khatri-Rao product approaches. Source number estimation accuracy can be enhanced by increasing the number of array elements, but it is often limited due to hardware and software cost. The authors have already proposed a low-cost array receiver system using switches which can reduce receiver...
Noise power and noise figure are detailedly analysed and deduced in theory for mult-port network in active electrically scanned array(AESA) radar, especially in AESA radar. Mathematical expressions of output noise power and total noise figure of network are given out under various conditions. Accordingly, this provides a basis of theories for multi-port network and radar receiver system design, the...
Through-Silicon-Via (TSV) has been considered as a promising technology in 3D integration. However, it has several challenges such as thermal issues, mechanical stress, etc. Contactless interconnect techniques such as inductive coupling and capacitive coupling have been investigated as alternative solutions. In this paper, we present several capacitive coupled interconnect structures. Various challenges...
A continuous-time low-pass sigma-delta modulator (ΣΔM) with a chain of integrators and weighted capacitive feedforward (CICFF) summation topology is fabricated by tsmc 0.18 um CMOS process. This proposed including health transducer with wireless charging and WuRx front-end on tracheostomy tube for microsystems technology in hospital. The summation of feedforward signals is implemented by the weighted...
In this paper, the capacity of a communication system based on orbital angular momentum (OAM) multiplexing is thoroughly studied and compared with the conventional multiple input multiple output (MIMO) system under different settings. In our studied OAM multiplexing communication system, both the transmitter side and the receiver side use uniform circular array (UCA) with identical or different settings...
Several terrestrial communication systems use the same frequency spectrum as Global Navigation Satellite Systems (GNSS) or bands close to it. Pseudolites constitute one such system that generally uses the GNSS spectrum for signal propagation. The signals from pseudolites in the operating region play a crucial role in augmenting satellite based user navigation. These signal transmitters are deployed...
It has been recently shown that the multiple-input-multiple-output (MIMO) radar has the potential to dramatically improve the performance of the conventional radar systems. In this paper, we focus on the parameter estimation problem of the transmit diversity MIMO radar. The adaptive pulse compression is a widely used method in MIMO radar because of its superior performance to suppress the range sidelobes...
This paper presents an integrated Ka-band 2×2 True-Time-Delay (TTD) phased array receiver using a 0.25nm SiGe:C BiCMOS technology. Each phased array receiver channel is able to perform 20.5 ps variable delay as well as 6 dB variable gain. A mixer and buffer are integrated to down-convert the RF signal into a fixed IF1 at 11 GHz. Each receiver channel presents more than 20 dB RF-IF1 conversion gain...
Array radar interchannel mismatch may seriously degrade the performance of the array signal processing unless some form of compensation is employed. The compensation can be achieved by means of equalizer. Coefficients of equalizer can be solved by the least-squares theory. This paper introduces convex optimization to enhance the performance of equalizer. Simulation results show that convex optimization...
This paper presents the design and evaluation of a large scale template-based Coarse-Grained Reconfigurable Array (CGRA) generated accelerator that processes correlation algorithm for Timing Synchronization (TS) required in Orthogonal Frequency-Division Multiplexing (OFDM) receivers. The CGRA works as a coprocessor with a Reduced Instruction-Set Computing (RISC) processor. The CGRA accelerator is...
Traditional methods of securing communications rely on methods, such as encryption, which require coordination between the transmitter and the receiver. Physical layer encryption techniques propose exploiting transmit arrays to cover the transmitted signal with beamformed noise or to generate directional modulation to provide security without requiring coordination a priori between the transmitter...
The three-dimensional Finite Difference Time Domain (FDTD) method was used to simulate the reflections of the three-component single well imaging. The simulation results proved the efficiency of the SH wave imaging, and also pointed out the potential problems. Besides, unlike the transverse components which were commonly used, the axial component was proven to be prominent in the logging data, thus...
The potential to provide multi-gbps throughput has made 60 GHz communication an attractive choice for next-generation WLANs. Due to highly directional nature of the communication, a 60 GHz link faces frequent outages in the presence of mobility. In this work, we present a sensor-assisted multi-level codebook-based beam width adaptation and beam switching to address the mobility challenges in 60 GHz...
A sequentially switched antenna array receiver (SSAAR) has been developed in order to lessen the fast-fading effects on super-express trains. The array elements are switched in reverse sequence to the direction of the train motion. To demonstrate the performance improvements, measurements were made using a scale model train with receiver moving at 3.6 km/h. A software simulation based on the Worldwide...
This paper presents the implementation of Orthogonal Frequency-Division Multiplexing receiver blocks as accelerators using a template-based Coarse-Grained Reconfigurable Array (CGRA) device. The CGRA operates with a Reduced Instruction-Set Computing (RISC) processor so that the overall system yields the benefits of general- and special-purpose processing. The accelerators are designed by crafting...
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