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The problem of underwater Finger localization is a crucial part of the underwater pipeline monitoring and maintenance by using an AUV in oil and gas industries. In this problem, a Finger repeatedly transmits pulses of audio signals to an array of hydrophones. Due to the delay pattern, the direction of a Finger relative to the hydrophone array can be estimated. However, since underwater environment...
Dynamic receive beamforming updates focusing delays for every samples of a scanline, leading to increased hardware complexity. To reduce this, pseudo-dynamic receive beamforming is applied to divide scanlines into windows and each window shares the same focusing delays. However, only one sample in a window is in focus, while the rest are out of focus. This paper presents a method to enhance pseudo-dynamic...
This paper presents two methods for reducing complexity of dynamic receive beamforming in order to be implemented on a single field-programmable gate array (FPGA) with 500K gates. These methods apply windows to divide each scanline into segments and each segment has its own focus at the center. One method uses constant window size and the other applies dynamic window size that equalizes the off-focus...
Beamforming the ultrasound radiofrequency (RF) data on the computer in stead of doing it on the hardware is currently developed in many research groups. This requires fast transferring of the large amount of data in real-time from the ultrasound scanner front end to the computer. Despite of using an expensive hardware for fast data transfer, we are interested in compress the data before transferring...
This paper presents a hardware design of an ultrasound imaging system for transmitting pulses and acquiring echo signals to/from individual elements of an array transducer. Since most of the ultrasound imaging systems in the market provide only image files after reconstruction, the presented hardware can be controlled by a computer in order to transmit pulses in specific patterns to transducer elements...
The proliferation of mobile computing devices and wireless positioning networks has fostered a growing interest in location-aware systems and devices. Most technologies such as radio frequency identification (RFID), RADAR, etc, use at least three base station (BS) for calculating position of target objects. This paper describes an improvement of the previous OneBS algorithm. The proposed system uses...
In this paper, the magnetic field distribution of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot is presented. The correlations between the field distributions of the antenna and the mode-based field distributions are presented. The radiation pattern, magnetic field distribution and magnitude of S11 are investigated in the terms of the length of the...
This work presents a simple switched beam antenna system for the localization system in wireless sensor networks (WSNs). The element patterns are chosen for the requirements. A simple beamforming network is fabricated and tested. The antenna patterns for the system are numerically computed in unbounded free space and compared with the ones measured in the indoor environment. The results show that...
This paper presents the radiation characteristics of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot. The magnetic fields inside the sectoral cylindrical resonator for the first few modes are presented with sectoral angle of 60 degrees. It shows that the appropriate mode for a slot array antenna on a concentric sectoral cylindrical resonator is the...
The proliferation of mobile computing devices and wireless geolocation networks has fostered a growing interest in location-aware systems and devices. Most technologies always use at least three base stations for computing the position of the target objects, including RFID (radiofrequency identification). This paper suggests a novel algorithm, using the RFID-system, to support one reader for localizing...
This paper presents a method to identify the maturity of durian using radar equation. The measurement system consists of two identical square patch antennas acting as a transmitter and a receiver. The return loss of the transmitter and the transmission coefficient at the receiver are measured using network analyzer. These measured data are used to determine the ratio of the effective reflection coefficients...
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