11 research outputs found
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FMCW Subsurface Microwave Imaging with Hexagonal Antenna Arrays
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CAGround-penetrating radar (GPR) imaging is typically conducted in the pulse-echo mono-static format with a simple CW pulse as the probing signal. Recently, the data-acquisition hardware has been extended to the use of linear multi-element arrays. This paper presents an advanced GPR imaging system with FMCW probing waveforms, with a seven-element hexagonal array and software-defined data-acquisition hardware. The use of FMCW probing signals is for the optimization of the information contents of the returned waveforms. The utilization of the hexagonal unit is to produce sub-images with direction-independent resolution capability. In this paper, mathematical analysis, system modeling, field experiments, and image reconstruction are included to illustrate the performance and capability of the engineering concepts.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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THREE-DIMENSIONAL MOTION ESTIMATION AND IMAGE FORMATION WITH ACTIVE ARRAYS
For target imaging and tracking systems, a key signal processing task is motion estimation. Specifically, the trajectory of a maneuvering target undergoing rigid body motion can be described through a series of translational and rotational transformations. Estimation of these motion parameters provides the tracking system enough information to calculate the targets trajectory over time. Determining the rotational motion to a high accuracy is also very important, as the imaging system can then form an image of the target over multiple aspect angles and thus increase the resolution performance. This paper focuses on algorithm development and performance limitations for motion estimation and image formation using active sensing arrays.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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WAVEFIELD-BASED MOTION ESTIMATION FOR RADAR AND SONAR ARRAY SYSTEMS
This paper introduces a generalized and computationally efficient approach for the estimation of target motion parameters from received wavefield data collected from coherent sensing systems such as radar and sonar measurement arrays. The mathematical content of the algorithm is described, along with the general processing procedure to perform on recorded data. The algorithm presents a solution to the joint estimation of translational motion and periodic motion of targets, which has many practical applications for sensing and detection tasks. Experimental and simulation results are included supporting the effectiveness of the method.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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Detection and Imaging of Micro-Periodic Motion with FMCW Sensing Systems
ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVMotion estimation is a problem that is encountered in a diverse range of technical fields. This paper demonstrates the development of a solution to the motion estimation problem in the context of imaging systems. First the general case of motion estimation is outlined followed by the special case of micro-periodic motion. The design of an FMCW microwave imaging system optimized for micro-periodic motion is then presented along with experiments and results that support the theory.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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Circular-Mode Synthetic Aperture Subsurface Imaging with MIMO FMCW Microwave Array System
ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NVThis paper describes the analysis and development of microwave subsurface synthetic-aperture imaging in the circular-scan mode with a four-antenna FMCW MIMO radar system. The objective is to improve the localization and correspondence capability of the imaging operation.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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Estimation of Angle of Arrival with Two-Dimensional Circular and Nonuniform Arrays
ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVPositioning systems tasked with performing geolocation of objects have grown in importance in recent years as the demand for accurate position and spatial data has increased. Parameter estimation of the angle of arrival is a common approach used in positioning systems that has had great success. This paper presents the design and development of a computationally efficient angle of arrival estimation technique that is reconfigurable for changing requirements that different applications may impose. The theory explaining the method is outlined, along with field experiments and simulations to provide validation for the effectiveness and accuracy of the approach.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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NEAR-FIELD HOMING AND GUIDANCE PLANNING FOR AUTONOMOUS NAVIGATION SYSTEMS
Advances in planning and controls algorithms for Unmanned Autonomous Vehicles (UAVs) have led to a substantial increase in a wide variety of applications. An important task for UAVs is au-tomated high-precision homing-and-docking. This requires the UAV to autonomously estimate its relative bearing to the home docking station and plan its optimal approach accordingly. This paper presents the design of homing and navigation system for UAVs that can operate in near-field scenarios. The system incorporates a dual-transmitter/receiver design and through a modified angle of arrival and motion estimation routine, the UAV can determine its relative bearing to the homing station while simultaneously planning the optimal approach. The approach planning algorithm will be described, along with theoretical analysis and simulated results documenting its performance in comparison to other techniques.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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Homing and Docking Algorithms for Circular Transmission and Receiver Arrays
Homing and docking are two major components in the navigation of UAV’s and UUV’s. It involves the estimation of the six-element displacement vector based on the received signals, where three of the vector elements are associated with the translational displacement and the other three are for the rotation vector.
The homing procedure is based on the estimation of the rotation vector with far-field approximations. In the docking range, the displacement estimation becomes more sensitive and critical. Far-field approximation-based algorithms are no longer effective, and high-precision techniques become important and need to be developed.
In this paper, we examine and model the multi-dimensional displacement estimation for circular arrays. It allows us to accurately assess the performance as well as the limitation of the algorithms, with respect to various system parameters such as the size of the arrays, range distance, transmitted waveforms, and signal processing algorithms.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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REMOTE HEART MONITORING VIA MEDICAL TELEMETRY
Today, a wide range of heart conditions can be monitored remotely with relatively inexpensive passive sensing technologies, enabling the potential for long-term monitoring and prognosis of patient state under representative environmental stimuli. A medical telemetry system that can incorporate such passive measurements and provide key diagnostic information to medical professionals would provide tremendous value to patients via quantitative and personalized healthcare. This paper presents an overview of passive sensing methods that could be utilized in a medical telemetry system for remote heart monitoring of patients. While active systems are another attractive option, they impose additional constraints on the system that require careful calibration, expert control, and more complex instrumentation. The methods presented here are based on low-cost, sensor technology with the potential to greatly improve long-term non-invasive, heart-health monitoring.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection
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CHANNEL AND SPECTRUM ESTIMATION FOR SOFTWARE DEFINED RADIO
Software defined radios are rapidly increasing in both research and commercial usage for many different applications. As the number of deployed systems increase, a difficult problem that remains is efficient usage of the Radio-Frequency (RF) spectrum to be shared among all these devices. Two key tasks for the radio to perform here include spectral estimation of the RF environment and channel estimation of the communication channel for which the data will be transmitted. These two steps are linked as the communication channel can change over different portions of the RF-spectrum. In this work, an algorithmic approach is presented for passive and active channel estimation procedures for wideband software-defined radios. The algorithm is comprised of first channel quality estimation followed by communication channel planning to optimize the overall performance.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection