| 1. |
|
|
| 2. |
- De Angelis, Alessio, et al.
(författare)
-
A Low-Cost Ultra-Wideband Indoor Ranging System
- 2009
-
Ingår i: IEEE Transactions on Instrumentation and Measurement. - 0018-9456 .- 1557-9662. ; 58:12, s. 3935-3942
-
Tidskriftsartikel (refereegranskat)abstract
- This paper presents the development of a low-cost indoor ranging technique based on time-of-arrival (TOA) estimation, using short-pulse ultra-wideband (UWB) signals. The realized system includes two identical UWB transceiver devices, in which the receiver section is based on a tunnel diode detector and the pulse generation is performed by a common bipolar transistor driven in avalanche mode. An indirect measurement of the distance between the devices is obtained by measuring the frequency of the generated pulse train. A theoretical model of the system is described, and a statistical analysis is presented, including the closed-form evaluation of the Cramer-Rao lower bound (CRLB) on the distance estimation and showing the asymptotic statistical efficiency of the proposed estimators. Furthermore, the principle of operation of the realized system prototypes is described, along with some implementation issues. Finally, experimental results are shown and discussed.
|
|
| 3. |
- De Angelis, Alessio, et al.
(författare)
-
A low-cost ultra-wideband indoor ranging technique
- 2007
-
Ingår i: 2007 24th IEEE Instrumentation and Measurement Technology Conference, VOLS 1-5. ; , s. 1308-1313
-
Konferensbidrag (refereegranskat)abstract
- This paper presents the development of a low-cost indoor ranging technique based on Time-Of-Arrival (TOA) estimation, using Short-Pulse Ultra-Wideband (UWB) signals. The realized system includes two identical UWB transceiver devices, in which the receiver section is based on a tunnel diode detector and the pulse generation is performed by a common bipolar transistor driven in avalanche mode. An indirect measurement of the distance between the devices is obtained by measuring the frequency of the generated pulse train. A theoretical model of the system is described and a statistical analysis is presented, including the evaluation of the Cramer-Rao Lower Bound (CRLB) on the distance estimation. Furthermore the principle of operation of the realized system prototypes is described, along with some implementation issues. Finally experimental results are shown and discussed.
|
|
| 4. |
- De Angelis, Alessio, et al.
(författare)
-
A Vector Approach for Image Quality Assessment and Some Metrological Considerations
- 2009
-
Ingår i: IEEE Transactions on Instrumentation and Measurement. - 0018-9456 .- 1557-9662. ; 58:1, s. 14-25
-
Tidskriftsartikel (refereegranskat)abstract
- The main purpose of this paper is to present a metrology-based view of the image quality assessment (IQA) field. Three main topics are developed. First, the state of the art in the field of IQA is presented, providing a classification of some of the most important objective and subjective IQA methods. Then, some aspects of the field are analyzed from a metrological point of view, also through a comparison with the software quality measurement area. In particular, a statistical approach to the evaluation of the uncertainty for IQA objective methods is presented, and the topic of measurement modeling for subjective IQA methods is analyzed. Finally, a vector approach for full-reference IQA is discussed, with applications to images corrupted by impulse and Gaussian noise. For these applications, the vector root mean squared error (VRMSE) and fuzzy VRMSE are introduced. These vector parameters provide a possible way to overcome the main limitations of the mean-squared-error-based IQA methods.
|
|
| 5. |
- De Angelis, Alessio, et al.
(författare)
-
An Experimental UWB Distance Measurement System
- 2008
-
Ingår i: 25th IEEE Instrumentation and Measurement Technology Conference, VOLS 1-5. ; , s. 1016-1020
-
Konferensbidrag (refereegranskat)abstract
- This paper presents a distance-measuring system based on the accurate round-trip time-of-flight measurement of single Ultra-Wideband pulses, propagating between two transceiver devices. The architectures of two realized devices, referred to as master and slave, are described The master device implements the time-interval measuring function, by means of a Time-to-Digital Converter integrated circuit, while the slave acts as pulse repeater Both devices are designed for low-cost realization and low-power operations. This paper also presents and discusses some experimental results obtained from the system prototype. Finally, some numerical simulations results are shown, which could provide an explanation for the non-idealities in the observed distance-measuring behaviour of the system.
|
|
| 6. |
- De Angelis, Alessio, et al.
(författare)
-
Characterization and Modeling of an Experimental UWB Pulse-Based Distance Measurement System
- 2009
-
Ingår i: IEEE Transactions on Instrumentation and Measurement. - 0018-9456 .- 1557-9662. ; 58:5, s. 1479-1486
-
Tidskriftsartikel (refereegranskat)abstract
- This paper presents a distance-measuring system based on the accurate round-trip time-of-flight measurement of single ultrawideband pulses propagating between two transceiver devices. The architectures of two realized devices, which are referred to as the master and the slave, are described. The master device implements the time-interval measuring function by means of a time-to-digital converter (TDC) integrated circuit, whereas the slave acts as a pulse repeater. Both devices are designed for low-cost realization and low-power operations. Furthermore, two pulse-detection modules are described based on signal-threshold and energy detection, respectively. This paper also presents and discusses some experimental results that are obtained from the system prototype. Finally, some numerical simulation results, which provide an explanation for the nonidealities in the observed distance-measuring behavior of the system, are shown.
|
|
| 7. |
|
|
| 8. |
- De Angelis, Alessio, et al.
(författare)
-
Image quality assessment : an overview and some metrological considerations
- 2007
-
Ingår i: 2007 IEEE INTERNATIONAL WORKSHOP ON ADVANCED METHODS FOR UNCERTAINTY ESTIMATION IN MEASUREMENT. ; , s. 47-52
-
Konferensbidrag (refereegranskat)abstract
- This paper presents the state of the art in the field of Image Quality Assessment (IQA), providing a classification of some of the most important objective and subjective IQA methods. Furthermore, some aspects of the field are analysed from a metrological point of view, also through comparison with the software quality measurement area. In particular a statistical approach to the evaluation of the uncertainty for IQA objective methods is presented and an example is provided. The topic of measurement modelling for subjective IQA methods is also analysed. Finally, a case study of images corrupted by impulse noise is discussed.
|
|
| 9. |
- Pasku, Valter, et al.
(författare)
-
A Magnetic Ranging Aided Dead-Reckoning Indoor Positioning System for Pedestrian Applications
- 2016
-
Ingår i: 2016 IEEE INTERNATIONAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE PROCEEDINGS. - : IEEE conference proceedings. - 9781467392204 ; , s. 1526-1531
-
Konferensbidrag (refereegranskat)abstract
- This paper investigates the applicability of a developed magnetic ranging and positioning system (MPS) as a support for a dead reckoning inertial navigation system for pedestrian applications. The integrated system combines the complementary properties of the separate systems, operating over long periods of time and in cluttered indoor areas with partial non-line-of-sight conditions. The obtained results show that the proposed approach can effectively improve the coverage area of the MPS and the operation time with bounded errors of the dead reckoning based system.
|
|
| 10. |
- Pasku, Valter, et al.
(författare)
-
A Magnetic Ranging-Aided Dead-Reckoning Positioning System for Pedestrian Applications
- 2017
-
Ingår i: IEEE Transactions on Instrumentation and Measurement. - : IEEE. - 0018-9456 .- 1557-9662. ; 66:5, s. 953-963
-
Tidskriftsartikel (refereegranskat)abstract
- This paper investigates the applicability of a developed Magnetic Positioning System (MPS) as a support for a dead-reckoning inertial navigation system (DR-INS) for pedestrian applications. The integrated system combines the complementary properties of the separate systems, operating over long periods of time and in cluttered indoor areas with partial nonline-of-sight conditions. The obtained results show that the proposed approach can effectively improve the coverage area of the MPS and the operation time with bounded errors of the DR-INS. In particular, a solution that provides bounded position errors of 1-2 m over significantly long periods of time up to 45 min, in realistic indoor environments, is demonstrated. Moreover, system applicability is also shown in those scenarios where arbitrary orientations of the MPS mobile node are considered and an MPS position estimate is not available due to less than three distance measurements.
|
|
| 11. |
- Santoni, Francesco, et al.
(författare)
-
Calibration and Characterization of a Magnetic Positioning System Using a Robotic Arm
- 2019
-
Ingår i: IEEE Transactions on Instrumentation and Measurement. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9456 .- 1557-9662. ; 68:5, s. 1494-1502
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, a robotic arm moving along a user-defined trajectory is used to calibrate a short-range magnetic positioning system (MPS). Such system estimates the position and attitude of an active transmitting coil by measuring the induced voltage on a set of fixed receiving coils, with known position and orientation. This estimate is obtained by solving an optimization problem that can be decomposed into a linear and a reduced nonlinear problem. Then, a Kalman Filter is used to process the estimated positions and obtain smooth trajectories. Data acquisition and processing are performed in real time by the MPS. In this context, the robotic arm is used to provide ground truth, i.e., to move the active coil along a known trajectory, while simultaneously the MPS estimates the position of the active coil. Such ground-truth information is then used to calibrate the MPS and improve its accuracy. To align the robotic arm with the MPS, a preliminary calibration procedure of the robot is performed. Then, a wide ground-truth trajectory is used to estimate the calibration parameters of the MPS itself, namely, the positions and orientation of the fixed coils. To validate the efficiency of the calibration procedure, the accuracy of the MPS is evaluated across several trajectories. The results show that the mean positioning error is less than 3 mm. Finally, an on-the-fly calibration method simultaneously estimating positions and attitudes of both the active coil and all the receivers is investigated.
|
|
