Examination of the Accuracy and Usefulness of Garmin and Suunto GNSS Devices during Navigation of the TS-11 “Iskra” Jet Aircraft

2017 ◽  
Author(s):  
Adam Ciecko ◽  
Grzegorz Grunwald ◽  
Rafał Kazmierczak ◽  
Marek Dobek ◽  
Piotr Gołabek
Keyword(s):  
Post Processing ◽  
Positioning Accuracy ◽  
Reference Position ◽  
Plane Trajectory ◽  
High Speeds

This study was designed and performed in order to determine the accuracy and usefulness of different modern Garmin and Suunto GNSS devices – mainly smartwatches – during a flight of TS-11 “Iskra” aircraft. The plane trajectory was determined using six different navigation devices placed in a cockpit of an aircraft. To calculate reference position – Thales Mobile Mapper with post-processing option and data from Polish ASG-EUPOS network was used. The obtained results show that the tested devices gave reasonable positioning accuracy and can be used on board of an aircraft traveling at high speeds. However, it must be emphasized that smartwatches can be only used as a supplementary navigation aid during any air operation.

scholarly journals A New Asynchronous RTK Method to Mitigate Base Station Observation Outages

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3376 ◽  
Author(s):  
Yuan Du ◽  
Guanwen Huang ◽  
Qin Zhang ◽  
Yang Gao ◽  
Yuting Gao
Keyword(s):  
Real Time ◽  
Base Station ◽  
Global Navigation Satellite Systems ◽  
Observation Data ◽  
Post Processing ◽  
Positioning Accuracy ◽  
Real Time Processing ◽  
Phase Measurements ◽  
Satellite Systems ◽  
Precise Ephemeris

Real-time kinematic (RTK) positioning is a satellite navigation technique that is widely used to enhance the precision of position data obtained from global navigation satellite systems (GNSS). This technique can reduce or eliminate significant correlation errors via the enhancement of the base station observation data. However, observations received by the base station are often interrupted, delayed, and/or discontinuous, and in the absence of base station observation data the corresponding positioning accuracy of a rover declines rapidly. With the strategies proposed till date, the positioning accuracy can only be maintained at the centimeter-level for a short span of time, no more than three min. To address this, a novel asynchronous RTK method (that addresses asynchronous errors) that can bridge significant gaps in the observations at the base station is proposed. First, satellite clock and orbital errors are eliminated using the products of the final precise ephemeris during post-processing or the ultra-rapid precise ephemeris during real-time processing. Then the tropospheric error is corrected using the Saastamoinen model and the asynchronous ionospheric delay is corrected using the carrier phase measurements from the rover receiver. Finally, a straightforward first-degree polynomial function is used to predict the residual asynchronous error. Experimental results demonstrate that the proposed approach can achieve centimeter-level accuracy for as long as 15 min during interruptions in both real-time and post-processing scenarios, and that the accuracy of the real-time scheme can be maintained for 15 min even when a large systematic error is projected in the U direction.

Positioning accuracy improvement in five-axis milling by post processing

1997 ◽  
Vol 37 (2) ◽  
pp. 223-236 ◽  
Author(s):  
R.M.D. Mahbubur ◽  
J. Heikkala ◽  
K. Lappalainen ◽  
J.A. Karjalainen
Keyword(s):  
Post Processing ◽  
Accuracy Improvement ◽  
Positioning Accuracy ◽  
Five Axis

scholarly journals Urban area GPS positioning accuracy using ASG-EUPOS POZGEO service as a function of session duration

2014 ◽  
Vol 49 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Karol Dawidowicz ◽  
Grzegorz Krzan ◽  
Krzysztof Świątek
Keyword(s):  
Geodetic Network ◽  
Reference Station ◽  
Gps Data ◽  
Dual Frequency ◽  
Post Processing ◽  
Positioning Accuracy ◽  
Gps Positioning ◽  
Session Duration ◽  
Lower Accuracy ◽  
Gnss Observations

ABSTRACT GNSS observations carried out in a network of Continuously Operating Reference Station (CORS) are a complex systems which offer post-processing as well as corrections sent in realtime. In Poland, such a system has been in operation since June 2008, known as the Polish Active Geodetic Network (ASG-EUPOS). Usually the measurements performed in real time characterized lower accuracy than static measurements. For users who demand the highest precision results the post-processing services are provided. The paper presents an analysis of the position determination accuracy using ASG-EUPOS POZGEO service. It is well known that the final accuracy is e.g. the measuring conditions, time of observations or number of measured frequencies dependent. We processed 4 consecutive days of GPS data to determine how the accuracy of derived positional coordinates depends on the length of the observing session, the characteristics of horizon visibility on points and the used in post-processing observations (L1 or L1+L2). The POZGEO results show that horizontal accuracies of about 1-2 cm and vertical accuracies of 4 cm are achievable provided 0.5 hours dual frequency GPS data. The accuracy clearly decreases for point measured under conditions of strongly limited satellite availability

scholarly journals Assessment of Static Positioning Accuracy Using Low-Cost Smartphone GPS Devices for Geodetic Survey Points’ Determination and Monitoring

2020 ◽  
Vol 10 (15) ◽  
pp. 5308 ◽  
Author(s):  
Marcin Uradziński ◽  
Mieczysław Bakuła
Keyword(s):  
Mobile Phones ◽  
Carrier Phase ◽  
Low Cost ◽  
Satellite System ◽  
Base Station ◽  
Dual Frequency ◽  
Post Processing ◽  
Positioning Accuracy ◽  
Static Mode ◽  
Ambiguity Fixing

Recent developments enable to access raw Global Navigation Satellite System (GNSS) measurements of mobile phones. Initially, researchers using signals gathered by mobile phones for high accuracy surveying were not successful in ambiguity fixing. Nowadays, GNSS chips, which are built in the latest smartphones, deliver code and primarily carrier phase observations available for detailed analysis in post-processing applications. Therefore, we decided to check the performance of carrier phase ambiguity fixing and positioning accuracy results of the latest Huawei P30 pro smartphone equipped with a dual-frequency GNSS receiver. We collected 3 h of raw static data in separate sessions at a known point location. For two sessions, the mobile phone was mounted vertically and for the third one—horizontally. At the same time, a high-class geodetic receiver was used for L1 and L5 signal comparison purposes. The carrier phase measurements were processed using commercial post-processing software with reference to the closest base station observations located 4 km away. Additionally, 1 h sessions were divided into 10, 15, 20 and 30 min separate sub-sessions to check the accuracy of the surveying results in fast static mode. According to the post-processing results, we were able to fix all L1 ambiguities based on Global Positioning System (GPS)-only satellite constellation. In comparison to the fixed reference point position, all three 1 h static session results were at centimeters level of accuracy (1–4 cm). For fast static surveying mode, the best results were obtained for 20 and 30 min sessions, where average accuracy was also at centimeters level.

scholarly journals A New Variance-Covariance Matrix for Improving Positioning Accuracy in High-Speed GPS Receivers

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7324
Author(s):  
Narjes Rahemi ◽  
Mohammad Reza Mosavi ◽  
Diego Martín
Keyword(s):  
Kalman Filter ◽  
Covariance Matrix ◽  
High Speed ◽  
Dynamic Models ◽  
Unscented Kalman Filter ◽  
Statistical Characteristics ◽  
Spatial Correlations ◽  
Positioning Accuracy ◽  
High Speeds ◽  
Variance Covariance Matrix

One of the main challenges in using GPS is reducing the positioning accuracy in high-speed conditions. In this contribution, by considering the effect of spatial correlation between observations in estimating the covariances, we propose a model for determining the variance–covariance matrix (VCM) that improves the positioning accuracy without increasing the computational load. In addition, we compare the performance of the extended Kalman filter (EKF) and unscented Kalman filter (UKF) combined with different dynamic models, along with the proposed VCM in GPS positioning at high speeds. To review and test the methods, we used six motion scenarios with different speeds from medium to high and examined the positioning accuracy of the methods and some of their statistical characteristics. The simulation results demonstrate that the EKF algorithm based on the Gauss–Markov model, along with the proposed VCM (based on the sinusoidal function and considering spatial correlations), performs better and provides at least 30% improvement in the positioning, compared to the other methods.

scholarly journals Precise Point Positioning Using World’s First Dual-Frequency GPS/GALILEO Smartphone

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2593 ◽  
Author(s):  
Abdelsatar Elmezayen ◽  
Ahmed El-Rabbany
Keyword(s):  
Real Time ◽  
Precise Point Positioning ◽  
Low Cost ◽  
Time Windows ◽  
Reference Station ◽  
Dual Frequency ◽  
Post Processing ◽  
Short Baseline ◽  
Positioning Accuracy ◽  
Point Positioning

The release of the world’s first dual-frequency GPS/Galileo smartphone, Xiaomi mi 8, in 2018 provides an opportunity for high-precision positioning using ultra low-cost sensors. In this research, the GNSS precise point positioning (PPP) accuracy of the Xiaomi mi 8 smartphone is tested in post-processing and real-time modes. Raw dual-frequency observations are collected over two different time windows from both of the Xiaomi mi 8 smartphone and a Trimble R9 geodetic-quality GNSS receiver using a short baseline, due to the lack of a nearby reference station to the observation site. The data sets are first processed in differential modes using Trimble business center (TBC) software in order to provide the reference positioning solution for both of the geodetic receiver and the smartphone. An in-house PPP software is then used to process the collected data in both of post-processing and real-time modes. Precise ephemeris obtained from the multi-GNSS experiment (MGEX) is used for post-processing PPP, while the new NAVCAST real-time GNSS service, Germany, is used for real-time PPP. Additionally, the real-time PPP solution is assessed in both of static and kinematic modes. It is shown that the dual-frequency GNSS smartphone is capable of achieving decimeter-level positioning accuracy, in both of post-processing and real-time PPP modes, respectively. Meter-level positioning accuracy is achieved in the kinematic mode.

scholarly journals Research of Accuracy of the Aircraft Position Using the GPS and EGNOS Systems in Air Transport

2019 ◽  
Vol 21 (4) ◽  
pp. 27-34
Author(s):  
Kamil Krasuski ◽  
Ewelina Kobialka ◽  
Marek Grzegorzewski
Keyword(s):  
Experimental Test ◽  
Air Transport ◽  
Positioning Accuracy ◽  
East Central Europe ◽  
East Central ◽  
Reference Position ◽  
Satellite Systems ◽  
Gps Positioning ◽  
The Village

The article presents and describes results of research in determination of the aircraft positioning accuracy with use of the GPS and EGNOS satellite systems in the air navigation. The article, in particular, makes a comparison of the designated aircraft coordinates in the GPS and EGNOS systems in relation to the reference position, determined from the precision differential RTK-OTF technique. The experimental test was conducted in Slovakia, in the vicinity of Kosice airport. In the test, a trial flight by Cessna aircraft was executed over the village of Bidovce (LZBD) in Slovakia, in East-Central Europe. Within the conducted investigations, the GPS and EGNOS positioning accuracies were determined in real time during an in-flight experimental test. Based on the conducted investigations, it was found that the accuracy of the GPS positioning in the air navigation equals ±10 m throughout the most part of the air test. In the same period the EGNOS positioning accuracy in air navigation is equal to ± 5 m.

scholarly journals Performance analysis of GNSS/INS loosely coupled integration systems under GNSS signal blocking environment

2020 ◽  
Vol 206 ◽  
pp. 02013
Author(s):  
Mengke Wang ◽  
Peidong Yu ◽  
Yunzhi Li
Keyword(s):  
Autonomous Navigation ◽  
Inertial Navigation System ◽  
Satellite System ◽  
Sampling Frequency ◽  
Navigation Satellite ◽  
Navigation Systems ◽  
Post Processing ◽  
Positioning Accuracy ◽  
Loosely Coupled ◽  
Global Navigation Satellite

Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) are the most widely used navigation systems at present. Aiming at the limitations of a single system application, this paper uses kalman filter to fuse the pose information provided by GNSS and INS, respectively. GNSS has the characteristics of being easily affected by the environment but with high absolute positioning accuracy. INS has the characteristics of high sampling frequency and autonomous navigation, but the error accumulates with time. Combining the advantages of the two systems to achieve the purpose of obtaining higher-precision pose information. In addition, aiming at the problem that GNSS/INS integration cannot provide continuous, stable and reliable navigation solutions under the GNSS signal blocking environment, a smoothing post-processing algorithm for GNSS/INS integration is studied. Through experimental verification, this algorithm can effectively improve the pose accuracy under GNSS signal blocking environment.

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