scholarly journals Utilization gLAB software in precise aircraft positioning in air transport- airborne tests in Dęblin and Mielec

2018 ◽  
Vol 2018 (1) ◽  
pp. 27-36
Author(s):  
Henryk Jafernik ◽  
Kamil Krasuski ◽  
Janusz Ćwiklak
Keyword(s):  
Air Transport ◽  
Numerical Computations ◽  
Positioning Accuracy ◽  
Research Results ◽  
Preliminary Results ◽  
Geodetic Coordinates ◽  
Gps System ◽  
Better Than

This paper presents research results relate to determination aircraft coordinates using SPP method in kinematic mode. For this purpose C/A code on L1 frequency in GPS system from onboard Topcon TPS Hiper receiver were used. Numerical computations of aircraft coordinates in SPP module in gLAB software were executed. The SPP method was characterized and configuration of SPP module in gLAB software was described. In research part, two airborne tests (Mielec and Dęblin) were realized and preliminary results of positioning accuracy of aircrafts were presented. Accuracy of BLh geodetic coordinates for aircraft is better than 4 m in Mielec experiment and better than 12 m in Dęblin experiment, respectively.

scholarly journals Influence of the Ionospheric Delay on Designation of an Aircraft Position

2020 ◽  
Vol 22 (3) ◽  
pp. 3-10
Author(s):  
Janusz Cwiklak ◽  
Marek Grzegorzewski ◽  
Kamil Krasuski
Keyword(s):  
Accurate Solution ◽  
Ionospheric Delay ◽  
Ionospheric Correction ◽  
Positioning Accuracy ◽  
Research Results ◽  
Differential Technique ◽  
Ionospheric Models ◽  
Klobuchar Model ◽  
Gps System

The article presents and describes research results concerning determination of an impact of the ionospheric correction upon the positioning accuracy of an aircraft. The main objective of examinations was to verify three ionospheric models (the Klobuchar model, SBAS model and IONEX model) in determining aircraft coordinates. In the framework of the conducted simulations, the authors determined the aircraft coordinates by means of the SPP code method in the GPS system. The article presents a comparison of the determined aircraft coordinates in the SPP code method in relation to an accurate solution in the RTK-OTF differential technique. Based on the obtained results, it was found that e use of the SBAS and IONEX model is exploited to improve the positioning accuracy of an aircraft in relation to the Klobuchar model, from 20% to 72%, in the geocentric XYZ frame. The obtained findings of a simulation indicate that the ionospheric correction in the SBAS and IONEX models may be used to improve the performance of aircraft coordinates in air navigation.

Children's Performance on a Binaural Fusion Task

1981 ◽  
Vol 24 (4) ◽  
pp. 520-525 ◽  
Author(s):  
Bruce L. Plakke ◽  
Daniel J. Orchik ◽  
Daniel S. Beasley
Keyword(s):  
Enhancement Effect ◽  
Sensation Level ◽  
Large Measure ◽  
Filter Bandwidth ◽  
Research Results ◽  
Presentation Modes ◽  
Monosyllabic Words ◽  
Better Than

Binaural auditory fusion of 108 children (4, 6, and 8 years old) was studied using three lists of monosyllabic words (WIPI) presented at two sensation levels (30 and 40 dB). The words were processed to produce three bandwidth conditions (100, 300, 600 Hz) and were administered via three presentation modes (binaural fusion 1, diotic, binaural fusion 2). Results showed improved discrimination scores with increasing age, sensation level, and filter bandwidth. Diotic scores were better than binaural fusion scores for the narrower bandwidth conditions, but the diotic enhancement effect was seriously compromised in the widest bandwidth (600 Hz) condition. The results confirmed the contention that prior research results were equivocal due, in large measure, to procedural variability. Methods for reducing such variability and enhancing the clinical viability of binaural fusion tasks are suggested.

Analysis on Signal-in-Space Range Error and Positioning Accuracy of BDS-3

2021 ◽  
Author(s):  
Weiping Liu ◽  
Bo Jiao ◽  
Jinming Hao ◽  
Zhiwei Lv ◽  
Jiantao Xie ◽  
...  
Keyword(s):  
Navigation System ◽  
Convergence Time ◽  
Asia Pacific ◽  
Single Frequency ◽  
Earth Orbit ◽  
Positioning Accuracy ◽  
Point Positioning ◽  
Range Error ◽  
Space Range ◽  
Better Than

Abstract Being the first mixed-constellation global navigation system, the global BeiDou navigation system (BDS-3) designs new signals, the service performance of which has attracted extensive attention. In the present study, the Signal-in-space range error (SISRE) computation method for different types of navigation satellites was presented. And the differential code bias (DCB) correction method for BDS-3 new signals was deduced. Based on these, analysis and evaluation were done by adopting the actual measured data after the official launching of BDS-3. The results showed that BDS-3 performed better than the regional navigation satellite system (BDS-2) in terms of SISRE. Specifically, the SISRE of the BDS-3 medium earth orbit (MEO) satellites reached 0.52 m, slightly inferior compared to 0.4 m from Galileo, marginally better than 0.57 m from GPS, and significantly better than 2.33 m from GLONASS. And the BDS-3 inclined geostationary orbit (IGSO) satellites achieved the SISRE of 0.90 m, on par with that of the QZSS IGSO satellites. However, the average SISRE of BDS-3 geostationary earth orbit (GEO) satellites was 1.15 m, which was marginally inferior to that of the QZSS GEO satellite (0.91m). In terms of positioning accuracy, the overall three-dimensional single-frequency standard point positioning (SPP) accuracy of BDS-3 B1C, B2a, B1I, and B3I gained an accuracy level better than 5 m. Moreover, the B1I signal exhibited the best positioning accuracy in the Asian-Pacific region, while the B1C signal set forth the best positioning accuracy in the other regions. Owing to the advantage in signal frequency, the dual-frequency SPP accuracy of B1C+B2a surpassed that of the transitional signal of B1I+B3I. Since there are more visible satellites in Asia-Pacific, the positioning accuracy of BDS-3 was moderately superior to that of GPS. The precise point positioning (PPP) accuracy of BDS-3 B1C+B2a or B1I+B3I converged to the order of centimeters, marginally inferior to that of the GPS L1+L2. However, these three combinations had a similar convergence time of approximately 30 minutes.

scholarly journals Channel state information–based multi-level fingerprinting for indoor localization with deep learning

2018 ◽  
Vol 14 (10) ◽  
pp. 155014771880671 ◽  
Author(s):  
Tao Li ◽  
Hai Wang ◽  
Yuan Shao ◽  
Qiang Niu
Keyword(s):  
Deep Learning ◽  
Channel State Information ◽  
Deep Neural Networks ◽  
Training Phase ◽  
Channel State ◽  
Positioning Accuracy ◽  
State Information ◽  
Filtering Method ◽  
Multi Level ◽  
Better Than

With the rapid growth of indoor positioning requirements without equipment and the convenience of channel state information acquisition, the research on indoor fingerprint positioning based on channel state information is increasingly valued. In this article, a multi-level fingerprinting approach is proposed, which is composed of two-level methods: the first layer is achieved by deep learning and the second layer is implemented by the optimal subcarriers filtering method. This method using channel state information is termed multi-level fingerprinting with deep learning. Deep neural networks are applied in the deep learning of the first layer of multi-level fingerprinting with deep learning, which includes two phases: an offline training phase and an online localization phase. In the offline training phase, deep neural networks are used to train the optimal weights. In the online localization phase, the top five closest positions to the location position are obtained through forward propagation. The second layer optimizes the results of the first layer through the optimal subcarriers filtering method. Under the accuracy of 0.6 m, the positioning accuracy of two common environments has reached, respectively, 96% and 93.9%. The evaluation results show that the positioning accuracy of this method is better than the method based on received signal strength, and it is better than the support vector machine method, which is also slightly improved compared with the deep learning method.

The Effects of Diminished Reality on the Detection of and Response to Notifications

2021 ◽  
Vol 65 (1) ◽  
pp. 159-163
Author(s):  
Khalaeb Richardson ◽  
Anne Collins McLaughlin ◽  
Mitchell McDonald ◽  
Aaron Crowson
Keyword(s):  
Augmented Reality ◽  
Task Performance ◽  
Display System ◽  
Research Results ◽  
Cognitive Aids ◽  
Auditory Distractions ◽  
External Stimuli ◽  
Better Than

Many environments contain visual and auditory distractions. Cognitive aids help limit these distractions, support attention, and improve task performance. One way this is done is by adding information to the environment via Augmented Reality (AR). Attention may also be supported by removing distractors using Diminished Reality (DR), a form of AR that computationally erases, de-emphasizes, or otherwise diminishes external stimuli. However, there was no research investigating the design of the control and display system for DR technology and the question of how to redirect or gain someone’s attention when their environment is diminished had not been addressed. This study explored the acceptability and effectiveness of notifications with varying attributes and fills that gap in research. Results indicated that low specificity notifications in a diminished environment are rated as being subjectively better than notifications of other formats; low specificity messages were also recalled at a greater rate.

scholarly journals Monitoring Aircraft Position Using EGNOS Data for the SBAS APV Approach to the Landing Procedure

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1945 ◽  
Author(s):  
Kamil Krasuski ◽  
Damian Wierzbicki
Keyword(s):  
Research Method ◽  
Satellite System ◽  
Civil Aviation ◽  
International Civil Aviation Organization ◽  
Positioning Accuracy ◽  
Research Findings ◽  
Global Navigation Satellite ◽  
Service Data ◽  
Computational Strategy ◽  
Better Than

The aim of this paper is to present the problem of the implementation of the EGNOS (European Geostationary Navigation Overlay Service) data for the processing of aircraft position determination. The main aim of the research is to develop a new computational strategy which might improve the performance of the EGNOS system in aviation, based on navigation solutions of an aircraft position, using several GNSS (Global Navigation Satellite System) onboard receivers. The results of an experimental test conducted by the Cessna 172 at EPDE (European Poland Deblin) (ICAO (International Civil Aviation Organization) code, N51°33.07’/E21°53.52’) aerodrome in Dęblin are presented and discussed in this paper. Two GNSS navigation receivers with the EGNOS positioning function for monitoring changes in the parameters of the aircraft position in real time during the landing phase were installed onboard a Cessna 172. Based on obtained research findings, it was discovered that the positioning accuracy was not higher than 2.1 m, and the integrity of positioning did not exceed 19 m. Moreover, the availability parameter was found to equal 1 (or 100%); also, no intervals in the continuity of the operation of the EGNOS system were recorded. In the paper, the results of the air test from Dęblin were compared with the parameters of positioning quality from the air test conducted in Chełm (ICAO code: EPCD, N51°04’57.8” E23°26’15”). In the air test in Chełm, the obtained parameters of EGNOS quality positioning were: better than 4.9 m for accuracy, less than 35.5 m for integrity, 100% for availability, and no breaks in continuity. Based on the results of the air tests in Dęblin and Chełm, it was concluded that the parameters of the EGNOS positioning quality in aviation for the SBAS (Satellite Based Augmentation System) APV (Approach to Vertical guidance) procedure were satisfied in accordance with the ICAO (International Civil Aviation Organization) requirements. The presented research method can be utilized in the SBAS APV landing procedure in Polish aviation. In this paper, the results of PDOP (Position Dilution of Precision) are presented and compared to the two air tests in Dęblin and Chełm. The maximum results of PDOP amounted to 1.4 in the air test in Dęblin, whereas they equaled 4.0 in the air test in Chełm. The paper also shows how the EGNOS system improved the aircraft position in relation to the only GPS solution. In this context, the EGNOS system improved the aircraft position from about 78% to 95% for each ellipsoidal coordinate axis.

Experimental Study on the Cutting Performance of Ultra-Precision Micro Milling Machine

2010 ◽  
Vol 97-101 ◽  
pp. 2546-2549
Author(s):  
Peng Zhang ◽  
Li Hua Lu ◽  
Bo Wang ◽  
Ying Chun Liang
Keyword(s):  
Aluminum Alloy ◽  
Pure Copper ◽  
Cutting Performance ◽  
Micro Milling ◽  
Step Response ◽  
Milling Machine ◽  
Positioning Accuracy ◽  
Ultra Precision ◽  
Scale Step ◽  
Better Than

To meet the requirement for the machining of the ultra-precision, ultra-smooth and micro-structure surface, an ultra-precision three axes micro milling machine was developed with the positioning accuracy better than ±0.25μm and the repetitive positioning accuracy better than ±0.2μm of all the three axes. The machine is proved to achieve the nanometer scale step response. Through milling experiments with micro-diameter tungsten carbide milling tool, the cutting performance has been further proved: the milling accuracy of 50μm-high step on the workpiece of aluminum alloy is better than ±0.3μm; and the 3D surface of pure copper workpiece is as smooth as mirror, with a roughness reaching 40nm. At last, the thin-walled structure of 10μm thickness on the workpiece of aluminum alloy is milled.

Effect of Conditioning Parameters on Surface Non-Uniformity of Polishing Pad in Chemical Mechanical Planarization

2008 ◽  
Vol 389-390 ◽  
pp. 498-503
Author(s):  
N. Qin ◽  
Dong Ming Guo ◽  
Ren Ke Kang ◽  
Feng Wei Huo
Keyword(s):  
Rotation Speed ◽  
Chemical Mechanical Planarization ◽  
Speed Ratio ◽  
Width Ratio ◽  
Next Generation ◽  
Stringent Requirement ◽  
Research Results ◽  
Polishing Pad ◽  
Kinematical Model ◽  
Better Than

The calculating model of surface non-uniformity of polishing pad and the kinematical model between polishing pad and conditioner are initially established. Then the effects of several conditioning parameters were investigated by using the two models. The results of simulation and calculation show that the width ratio of diamond band of conditoner and the rotation speed at the same speed ratio between pad and conditioner have little effect on the surface non-uniformity of polishing pad, while at high non-integer rotation speed ratio, the surface non-uniformity of polishing pad is better than that at low integer speed ratio. The research results are available to select appropriate conditioning parameters especially for the stringent requirement of within-wafer non-uniformity in next generation IC.

scholarly journals Methods of precise aircraft positioning in the GPS system with an application of the troposphere correction

2020 ◽  
Vol 109 ◽  
pp. 73-84
Author(s):  
Małgorzata KIRSCHENSTEIN ◽  
Kamil KRASUSKI ◽  
Artur GOŚ
Keyword(s):  
Observation Data ◽  
Reference Solution ◽  
Statistical Measure ◽  
Positioning Accuracy ◽  
Navigation Data ◽  
Gps Navigation ◽  
Aircraft Navigation ◽  
Gps System ◽  
Made In

This article presents the results of studies concerning the designation of accuracy in aircraft navigation positioning by means of the SPP and the SBAS code methods. The examination of the aircraft positioning accuracy was made in the aspect of the use of tropospheric correction in observation equations of the SPP and the SBAS positioning methods. The accuracy of the coordinates of the aircraft in the SPP and the SBAS solutions was referenced to the DGPS reference solution. The investigations were conducted on raw observation data and GPS navigation data in an air test in Dęblin. Based on the conducted calculations, it was proved that the lack of use of tropospheric correction in the SPP method causes an error in an aircraft position up to 18.5 m, and in the SBAS method up to 23.2 m. In addition, the statistical measure of RMS accuracy in the absence of applying the tropospheric correction in the SPP method results in an accuracy decrease to 8.6 m, and in the SBAS method to 12.2 m, accordingly.

On Sensitivity and Holding in Automotive Systems

2016 ◽  
Vol 60 (1) ◽  
pp. 1906-1910 ◽  
Author(s):  
Asaf Degani ◽  
Claudia V. Goldman ◽  
Omer Deutsch ◽  
Omer Tsimhoni
Keyword(s):  
Control System ◽  
Pilot Study ◽  
Climate Control ◽  
Human Machine Interaction ◽  
Human Expert ◽  
Preliminary Results ◽  
Automotive Systems ◽  
Machine Interaction ◽  
New System ◽  
Better Than

We propose an approach to human-machine interactions that emphasizes sensitivity to the user’s needs and consecrates caretaking, or holding, of the user so as to fulfill these needs. We borrow the concepts of sensitivity and holding from psychoanalysis and then operationalize them in the context of human-machine interaction. A pilot study of drivers’ interactions with a climate control system was conducted to understand drivers’ needs, wants, and manner of interaction. Based on these results we built an AI-based system that is sensitive to the users’ needs and attempts to fulfill them in a dedicated manner (holding). We then evaluate the new system in another driving study. Preliminary results suggest that a sensitive/holding machine is better than the regular interface and not far behind a human expert “working” the system in response to drivers’ needs and wants.

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