Investigations on the sensitivity of a stepped-frequency radar utilizing a vector network analyzer for Ground Penetrating Radar

Seyfried, Daniel; Schubert, Karsten; Schoebel, Joerg

doi:10.1016/j.jappgeo.2014.10.016

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The SFCW technique is widely known in the radar imaging community (see for example [32]), often to measure the RCS (radar cross sections) of unknown objects at multiple frequencies, e.g. by using a VNA (vector network analyzer) with a pair of transmitting/receiving antennas [33,34]. Its potential adoption in US has been considered in very few works, [28][29][30] and only in relation to pulse-echo geometries.…”

Section: Additional Remarks and Novelty Of Sfcw-usctmentioning

confidence: 99%

Stepped frequency ultrasound computed tomography with waveform inversion

Forte

2024

Biomed. Phys. Eng. Express

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Routine US (ultrasound) scans for breast imaging run on a conventional console suffer from machine and operator dependence and are subject to personal interpretation. Recently, the framework of USCT (ultrasound computed tomography) has emerged as a safe, powerful and operator independent alternative to diagnostic US scans and X-rays mammography. The most known systems employ one circular array or a combination of transmitters and receivers by exploiting reflection, diffraction and transmission data. These systems are based on a pulsed transmission. Following propagation in tissue, the signals are usually recorded with a direct RF sampling scheme and stored as digital time-series. Image reconstruction is performed in the frequency domain in the 400 kHz - 1 MHz bandwidth over a limited number of discrete frequencies.In this paper, we propose a new architecture based on the stepped frequency continuous waveform (SFCW) principle. In this scheme, the transmission is a continuous one and the received waveforms undergo a homo-dyne stage. By sequentially transmitting single tones at different frequencies, data can be collected directly in the frequency domain at specific frequencies, with programmable frequency steps and with any desired SNR. We describe in detail the transmitter and the receiver paths and compare with a conventional pulsed USCT architecture. Finally, we highlight the benefits of a SFCW-USCT device and comment on SNR, absorbed power, data fidelity and data storage.

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Section: Additional Remarks and Novelty Of Sfcw-usctmentioning

confidence: 99%

Stepped frequency ultrasound computed tomography with waveform inversion

Forte

2024

Biomed. Phys. Eng. Express

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“…Esto aportaría algo importante a nuestra investigación, como trabajar patrones pequeños de ondas y con características relevantes para construir nuestro algoritmo y simulación, si es el caso. Además de las diferentes aplicaciones que se le han dado dentro de la geofísica [47][48][49][50][51][52], que ve la importancia del estudio de las ondas penetrantes por la información que traen para ser codificada y controlada y, de esta manera, obtener un mejor beneficio, como lo plantean los artículos que en este caso centran su estudio en las GPR [48][49][50][51][52][53][54][55][56][57][58][59][60], pero sin ver lo microscópico del asunto que aportaría mucha información a los modelos por construir.…”

Section: Las Características Del Suelo De Las Minasunclassified

Tecnología aplicada en el funcionamiento y la detección de minas antipersonales: estado del arte

Ledezma-Ríos

2017

I2+D

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Revista Ingeniería, Investigación y Desarrollo Cómo citar este artículo:J.A. Ledezma-Rios, "Tecnología aplicada en el funcionamiento y la detección de minas antipersonales: estado del tema", Resumen El principal objetivo de esta investigación es conocer las diferentes tecnologías implementadas para la detección de minas antipersonales. Por diferentes medios bibliográficos se estudiaron las últimas actualizaciones empleadas para la detección de objetos enterrados, los factores que afectan la pérdida de energía de las ondas como transmisoras de información entre estos, las características del suelo, la amplitud de la señal emitida, la frecuencia y las condiciones del terreno. En este artículo se informa sobre los medios computacionales, de su trabajo con los diferentes algoritmos para modelar una información acertada de lo que está sucediendo con el fenómeno de detección. Asimismo, se dan a conocer a la comunidad científica los parámetros de susceptibilidad magnética, el porcentaje de agua y porosidad del entorno donde reaccionan las ondas emitidas, la dificultad de la estabilidad de la señal que se ha de capturar para detectar las minas antipersonales, en un contorno geográfico. En la actualidad se están utilizando tubos de PVC, latas y jeringas para su fabricación, y dispositivos de manipulación manual para su activación. Las ondas van a tener un comportamiento diferente ante estos materiales.Palabras clave: investigación; ondas; terreno; transmisoras; fabricación. AbstractThe main objective of this investigation is to know the different technologies implemented for the detection of antipersonnel mines, documented by different bibliographic means of the latest updates used for the detection of buried objects, the factors that affect the loss of energy of the waves as transmitters of information between them, the characteristics of the soil, the amplitude of the emitted signal, the frequency and the conditions of the terrain. This paper informs about the computational means, of their work with the different algorithms to model correct information of what is happening with the phenomenon of detection. Thus, through this research, the scientific community is informed on the parameters of magnetic susceptibility, the percentage of water and porosity of the environment where the emitted waves react, the difficulty of the stability of the signal to be captured to detect antipersonnel mines, in a geographical context. Currently, PVC tubes, cans, syringes and hand-held devices are being used for their production, and the waves will behave differently against these materials.

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“…We therefore conclude that noise effects do not determine a limit for the detection capability of our pulsed radar system. Thus, the increased detection capability coming along with low noise pre-amplification is not due to improved noise figure of the overall radar system (Seyfried et al, 2014c) but due to improved signal range for the ADC.…”

Section: Detection Capability Characterizationmentioning

confidence: 99%