Design of ℓ1 New Suboptimal Fractional Delays Controller for Discrete Non-Minimum Phase System under Unknown-but-Bounded Disturbance

ℓ1-regularization methodologies have appeared recently in many pattern recognition and image processing tasks frequently connected to ℓ1-optimization in the control theory. We consider the problem of optimal stabilizing controller synthesis for a discrete non-minimum phase dynamic plant described by a linear difference equation with an additive unknown-but-bounded noise. Under considering the “worst” case of noise, the solving of these optimization problem has a combinatorial complexity. The choosing of an appropriate sufficiently high sampling rate allows to achieve an arbitrarily small level of suboptimality using a noncombinatorial algorithm. In this paper, we suggest to use fractional delays to achieve a small level of suboptimality without increasing the sampling rate so much. We propose an approximation of the fractional lag with a combination of rounding and a first-order fractional lag filter. The suggested approximation of the fractional delay is illustrated via a simulation example with a non-minimum phase second-order plant. The proposed methodology appears to be suitable to be used in various pattern recognition approaches.

Download Full-text

On-line Continuous Control Set MPC for PMSM drives current loops at high sampling rate using qpOASES

2019 IEEE Energy Conversion Congress and Exposition (ECCE) ◽

10.1109/ecce.2019.8912838 ◽

2019 ◽

Cited By ~ 2

Author(s):

Francesco Toso ◽

Paolo Gherardo Carlet ◽

Andrea Favato ◽

Silverio Bolognani

Keyword(s):

Sampling Rate ◽

Continuous Control ◽

High Sampling ◽

High Sampling Rate ◽

On Line ◽

Control Set

Download Full-text

Development and Evaluation of a Low-Drift Inertial Sensor-Based System for Analysis of Alpine Skiing Performance

Sensors ◽

10.3390/s21072480 ◽

2021 ◽

Vol 21 (7) ◽

pp. 2480

Author(s):

Isidoro Ruiz-García ◽

Ismael Navarro-Marchal ◽

Javier Ocaña-Wilhelmi ◽

Alberto J. Palma ◽

Pablo J. Gómez-López ◽

...

Keyword(s):

Data Fusion ◽

Reference System ◽

Inertial Sensor ◽

Low Cost ◽

Sampling Rate ◽

Sensor Data ◽

Fusion Algorithm ◽

Improve Technique ◽

Worst Case ◽

Sensor Data Fusion

In skiing it is important to know how the skier accelerates and inclines the skis during the turn to avoid injuries and improve technique. The purpose of this pilot study with three participants was to develop and evaluate a compact, wireless, and low-cost system for detecting the inclination and acceleration of skis in the field based on inertial measurement units (IMU). To that end, a commercial IMU board was placed on each ski behind the skier boot. With the use of an attitude and heading reference system algorithm included in the sensor board, the orientation and attitude data of the skis were obtained (roll, pitch, and yaw) by IMU sensor data fusion. Results demonstrate that the proposed IMU-based system can provide reliable low-drifted data up to 11 min of continuous usage in the worst case. Inertial angle data from the IMU-based system were compared with the data collected by a video-based 3D-kinematic reference system to evaluate its operation in terms of data correlation and system performance. Correlation coefficients between 0.889 (roll) and 0.991 (yaw) were obtained. Mean biases from −1.13° (roll) to 0.44° (yaw) and 95% limits of agreements from 2.87° (yaw) to 6.27° (roll) were calculated for the 1-min trials. Although low mean biases were achieved, some limitations arose in the system precision for pitch and roll estimations that could be due to the low sampling rate allowed by the sensor data fusion algorithm and the initial zeroing of the gyroscope.

Download Full-text

Intelligent Displacement Measuring System for Rock Stratum

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.103.583 ◽

2011 ◽

Vol 103 ◽

pp. 583-586

Author(s):

Feng Ling Li ◽

Jian Hua Rong ◽

Yu Ping Zhang

Keyword(s):

Civil Engineer ◽

Real Time ◽

Sampling Rate ◽

Measuring System ◽

Displacement Sensor ◽

Rock Stratum ◽

Baud Rate ◽

Real Time Clock ◽

High Sampling Rate ◽

Displacement System

Measuring rock stratum displacement in dam grouting process is very important. A new displacement system is designed, comprising a programmable microcontroller Atmega16, a new grating capacitive displacement sensor(GCDS), DS1302 real time clock chip and announciator etc. The system has high sampling rate of 9600 baud rate and can trap the displacement equal to 0.001 millimeter in one second. Equipped with mechanical conveyance system, the system can be applied to the civil engineer. The experiment results show the instrument can measure accurately the displacement value and alarm geologic disaster in time, which can conduct continuous and accurate monitoring and provide operation decisions for dam engineers.

Download Full-text

An Automatic Method for Detection and Update of Additive Changes in Road Network with GPS Trajectory Data

ISPRS International Journal of Geo-Information ◽

10.3390/ijgi8090411 ◽

2019 ◽

Vol 8 (9) ◽

pp. 411 ◽

Cited By ~ 3

Author(s):

Tang ◽

Deng ◽

Huang ◽

Liu ◽

Chen

Keyword(s):

Road Network ◽

Sampling Rate ◽

Quality Data ◽

Automatic Method ◽

Trajectory Data ◽

The Road ◽

High Sampling Rate ◽

Map Generation ◽

Gps Trajectory Data ◽

Gps Trajectory

Ubiquitous trajectory data provides new opportunities for production and update of the road network. A number of methods have been proposed for road network construction and update based on trajectory data. However, existing methods were mainly focused on reconstruction of the existing road network, and the update of newly added roads was not given much attention. Besides, most of existing methods were designed for high sampling rate trajectory data, while the commonly available GPS trajectory data are usually low-quality data with noise, low sampling rates, and uneven spatial distributions. In this paper, we present an automatic method for detection and update of newly added roads based on the common low-quality trajectory data. First, additive changes (i.e., newly added roads) are detected using a point-to-segment matching algorithm. Then, the geometric structures of new roads are constructed based on a newly developed decomposition-combination map generation algorithm. Finally, the detected new roads are refined and combined with the original road network. Seven trajectory data were used to test the proposed method. Experiments show that the proposed method can successfully detect the additive changes and generate a road network which updates efficiently.

Download Full-text

High sampling rate measurement and data treatment for mobile investigations: Kinematic Electrical Resistivity Tomography (KERT)

Geoderma ◽

10.1016/j.geoderma.2016.08.007 ◽

2016 ◽

Vol 284 ◽

pp. 22-33 ◽

Cited By ~ 1

Author(s):

Olivier Guerrero ◽

Jean-François Lataste ◽

Antoine Marache

Keyword(s):

Electrical Resistivity ◽

Electrical Resistivity Tomography ◽

Sampling Rate ◽

Rate Measurement ◽

Resistivity Tomography ◽

Data Treatment ◽

High Sampling ◽

High Sampling Rate

Download Full-text

All-optical parallelization for high sampling rate photonic ADC in fully digital radar systems

Optical Fiber Communication Conference ◽

10.1364/ofc.2010.othu6 ◽

2010 ◽

Author(s):

Paolo Ghelfi ◽

Lingmei Ma ◽

Xiaoxia Wu ◽

Minyu Yao ◽

Alan E. Willner ◽

...

Keyword(s):

Sampling Rate ◽

Radar Systems ◽

High Sampling ◽

High Sampling Rate ◽

All Optical

Download Full-text

High sampling rate thermistor string observations at the slope of Great Meteor Seamount

Ocean Science ◽

10.5194/os-1-17-2005 ◽

2005 ◽

Vol 1 (1) ◽

pp. 17-28 ◽

Cited By ~ 16

Author(s):

H. van Haren ◽

R. Groenewegen ◽

M. Laan ◽

B. Koster

Keyword(s):

High Frequency ◽

North Atlantic Ocean ◽

Sampling Rate ◽

Very High Frequency ◽

High Sampling ◽

High Sampling Rate ◽

In Situ Calibration ◽

Great Meteor Seamount ◽

Very High

Abstract. A high sampling rate (1 Hz) thermistor string has been built to accommodate the scientific need to accurately monitor high-frequency and vigorous internal wave and overturning processes in the ocean. The thermistors and their custom designed electronics can register temperature at an estimated precision of about 0.001° C with a response time faster than 0.25 s down to depths of 6000 m. With a quick in situ calibration using SBE 911 CTD an absolute accuracy of 0.005° C is obtained. The present string holds 128 sensors at 0.5 m intervals, which are all read-out within 0.5 s. When sampling at 1 Hz, the batteries and the memory capacity of the recorder allow for deployments of up to 2 weeks. In this paper, the instrument is described in some detail. Its performance is illustrated with examples from the first moored observations, which show Kelvin-Helmholtz overturning and very high-frequency (Doppler-shifted) internal waves besides occasionally large turbulent bores moving up the sloping side of Great Meteor Seamount, Canary Basin, North-Atlantic Ocean.

Download Full-text