scholarly journals Roll Angle Measurement for a Spinning Vehicle Based on GPS Signals Received by a Single-Patch Antenna

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3479 ◽  
Author(s):  
Zilong Deng ◽  
Qiang Shen ◽  
Zhaowei Deng
Keyword(s):  
Global Positioning System ◽  
Signal To Noise Ratio ◽  
Angle Measurement ◽  
Roll Angle ◽  
Ratio Analysis ◽  
Rotary Table ◽  
Optimal Parameters ◽  
Single Side ◽  
Global Positioning ◽  
Trajectory Correction

Roll angle measurement is an essential technology in the trajectory correction projectiles. In this paper, an algorithm to detect the roll angle and rotational speed of a spinning vehicle is studied by using a GPS (Global Positioning System) receiver with a single side-mounted antenna. A Frequency-Locked Loop (FLL) assisted Phase-Locked Loop (PLL) is designed to obtain the attitude information from GPS signals, and the optimal parameters of this system are discussed when different rotational speeds are considered. The error estimation of this method and signal-to-noise ratio analysis of GPS signals are also studied. Finally, experiments on the rotary table were carried out to verify the proposed method. The experimental results showed that the proposed algorithm can detect the roll angle in a precision of within 5 degrees.

On Navigation Systems for Motorcycles: The Influence and Estimation of Roll Angle

2005 ◽  
Vol 58 (3) ◽  
pp. 375-388 ◽  
Author(s):  
Joshua P. Coaplen ◽  
Patrick Kessler ◽  
Oliver M. O'Reilly ◽  
Dan M. Stevens ◽  
J. Karl Hedrick
Keyword(s):  
Global Positioning System ◽  
Angular Rate ◽  
Roll Angle ◽  
Estimation Methods ◽  
Navigation Systems ◽  
Simulation Environment ◽  
Global Positioning ◽  
Heading Angle ◽  
Navigation Information ◽  
Navigation Scheme

Vehicle navigation systems use various sensors and the global positioning system (GPS) to locate a vehicle. This location is then matched to a map database to provide navigation information. Between GPS updates, the vehicle's heading angle and forward speed are used to “dead reckon” its position. Heading angle is often measured by integrating the output of a rate gyroscope. For this measurement to be equal to the vehicle's heading angle, the vehicle should not experience any rotation about its roll or pitch axes. For an automobile, the roll and pitch angles are small and may be neglected for the purposes of navigation. This article demonstrates that this same assumption is not true for a motorcycle. Through simulation, it is shown that for a motorcycle, obtaining a meaningful heading angle from a single angular rate measurement requires accounting for the motorcycle's roll angle. Methods to estimate roll angle and heading angle from available navigation measurements are presented, and two possible sensor configurations are compared. A motorcycle navigation scheme based on these roll angle estimation methods is shown to produce exceptional results in a simulation environment.

scholarly journals Age-Related Differences in the Physical and Physiological Demands during Small-Sided Games with Floaters

Sports ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 79 ◽  
Author(s):  
Alberto Rábano-Muñoz ◽  
Jose Asian-Clemente ◽  
Eduardo Sáez de Villarreal ◽  
Jack Nayler ◽  
Bernardo Requena
Keyword(s):  
Global Positioning System ◽  
Age Groups ◽  
Return To Play ◽  
Football Players ◽  
Ratio Analysis ◽  
Playing Field ◽  
Age Related ◽  
Global Positioning ◽  
Physiological Profiles ◽  
Physiological Demands

The purpose of this study was to compare the physical and physiological demands of a small-sided game (SSG) in three different age groups (senior, under-19 [U-19] and under-17 [U-17]) belonging to the same academy. A further aim was to contrast the physical and physiological profiles of normal and floater players during this task. Thirty male football players performed a 4 vs. 4 + 2 floaters on a playing field of 40 by 30m for four bouts of 4 min with 2 min of passive recovery. In addition to heart rate (mean and maximal), a GPS (Global Positioning System) system was used to record the distances covered at different speeds, the number of accelerations and decelerations, and the work/rest ratio (W:R Ratio). Analysis of the data showed that the demands of the SSGs are determined by the age of the players and that the regular players have greater demands than floater players in the SSGs utilized. These results suggest that the coaches should pay attention to the promotion of players to superior teams because there are physical differences between them (especially the U-17 to U-19 teams). Likewise, coaches should understand that floaters are a useful tool for regulating the training load of players and programming the return-to-play process, as floater players experience lower demands than normal players.

scholarly journals Design of Entry Detection Method for Top-Bounded Spaces Using GPS SNR and Spatial Characteristics for Seamless Positioning in Logistics Facilities

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6864
Author(s):  
Kenichi Tabata ◽  
Madoka Nakajima ◽  
Naohiko Kohtake
Keyword(s):  
Global Positioning System ◽  
Detection Method ◽  
Signal To Noise Ratio ◽  
Industrial Applications ◽  
Positioning System ◽  
Spatial Characteristics ◽  
Outdoor Spaces ◽  
Global Positioning ◽  
Simple Processing ◽  
Indoor And Outdoor

With the widespread use of indoor positioning technology, various services based on this technology are beginning to be offered to consumers and industrial applications. In the case of logistics facilities, in addition to indoor and outdoor spaces, there are top-bounded spaces (TBSs): elongated areas that are covered with roofs or eaves on the upper parts of buildings. The sides of such spaces are open, and workers and forklifts work in these areas. Only a few studies have been conducted on positioning methods for this unusual environment, and the way by which Signal-to-Noise Ratio (SNR) of Global Positioning System (GPS) changes with the stay in TBSs is unclear. Therefore, we conducted preliminary experiments and confirmed that TBS dwellings are difficult to stably detect with existing methods due to the combination of satellites with variable and unchanged SNRs. In this study, we designed a simple processing flow for selecting satellites with high probabilities of changing SNRs by using the spatial characteristics of TBSs as parameters (height, depth, and side opening orientation). We propose a method to detect the stay in TBSs using the SNR change rates of the selected satellites. As a result of evaluation experiments with three TBSs, we successfully detected the stay in TBSs with about 30% higher probability than those of an existing method.

scholarly journals Global Positioning System Interferometric Reflectometry for Accurate Tide Gauge Measurement: Insights from South Beach, Oregon, United States

2020 ◽  
Author(s):  
Kutubuddin Ansari ◽  
Tae-Suk Bae ◽  
Samed Inyurt
Keyword(s):  
Global Positioning System ◽  
Sea Water ◽  
Tide Gauge ◽  
Signal To Noise Ratio ◽  
Moving Average ◽  
Singular Spectrum Analysis ◽  
Autoregressive Moving Average ◽  
Positioning System ◽  
Observation Network ◽  
Global Positioning

Global Positioning System (GPS) stations located along coastal areas have the ability to measure tide gauge (TG) records by reflected signal reception from the sea water surface. In this study we used the GPS signal-to-noise ratio (SNR) data from the SEPT station (44.63 ⁰N, 124.05 ⁰W) located at South Beach, Oregon, USA, to estimate the TG records using only a few measurements. First, we derived the TG record from a GPS station (GPS-TG) and used traditional TG data from the National Water Level Observation Network (NWLON) sentinel station (Station ID: 9435380) located in Oregon for validation purposes because it was closest to the SEPT station. Our results show that the GPS-TG and NWLON-TG correlate well with the correlation coefficient (CC) of 0.942 and the root mean square (RMS) of their residuals was about 12.90 cm. The corresponding TG prediction by autoregressive moving average (ARMA-TG) and singular spectrum analysis (SSA-TG) models are evaluated for their effectiveness over the station. The comparative analysis demonstrates that the GPS-TG has improved correlation with ARMA-TG (CC of ~0.981 CC, RMS of ~4.80 cm), and SSA-TG (CC of ~0.998 CC, RMS of ~ 0.88 cm) compared to the NWLON-TG (CC of ~0.942 CC, RMS of ~12.90 cm) values. We believe the outcomes from this study contribute to a better understanding of the numerical modeling of TG records as well as other measurements based on reflectometry techniques.

Placement of team sport GPS devices for reliability assessment

2021 ◽  
pp. 175433712199145
Author(s):  
Ted Polglaze ◽  
Justin HY Tan ◽  
Peter Peeling
Keyword(s):  
Global Positioning System ◽  
Signal To Noise Ratio ◽  
Signal Integrity ◽  
Team Sport ◽  
Distance Measures ◽  
Total Distance ◽  
Speed Distribution ◽  
Global Positioning ◽  
Measurement Output ◽  
Gps Devices

The goal of this study was to determine the effect of unit placement on signal integrity and measurement output obtained during reliability trials for global positioning system (GPS) devices. Two of the same model GPS units were worn in four separate unit configurations (Piggyback, Above-Below, Front-Back and Lateral) during 4 × 2 lap repeats of a team sport simulation circuit. Differences in signal integrity indicators (# satellites, horizontal dilution of precision (HDoP), signal-to-noise ratio (SNR) and signal strength (SS)), total distance covered in each lap, and distance covered above and below 3 m·s−1, were compared between the two units. The results showed that for signal integrity measures, differences between units were negligible for Above-Below and Lateral, but comparatively high for Piggyback and Front-Back. For distance measures, values were similar between units for Above-Below, however, discrepancies occurred in both total distance and speed distribution for the other configurations. This study concluded that the Above-Below unit configuration yielded the smallest differences between units for signal integrity and measurement output. Therefore, the Above-Below configuration is recommended for future GPS reliability investigations.

scholarly journals Mitigation of Ionospheric Scintillation on Global Positioning System (GPS) Using Hamming and Convolutional Coding Techniques

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Festus K Ojo ◽  
Damilare O Akande ◽  
Babatunde S Daniel
Keyword(s):  
Global Positioning System ◽  
Satellite Communication ◽  
Signal To Noise Ratio ◽  
Power Level ◽  
Research Work ◽  
Ionospheric Scintillation ◽  
Error Correction Codes ◽  
Positioning System ◽  
Convolutional Coding ◽  
Global Positioning

The Global Positioning System (GPS) is a satellite-based system that can be used to locate positions anywhere on the earth surface. Any person with a GPS receiver can access the system, and it can be used for application that requires location coordinates. Currently, ionospheric scintillation is the largest error source in GPS. Scintillation causes some effects such as degradation of receiver tracking performance and in extreme cases, total loss of navigation capabilities.             Ionospheric scintillation is a problem for satellite communication because it affects the amplitude and phase of radio signals. A decrease in the amplitude of a radio signal reduces its power level which directly affects the signal to noise ratio, thus affecting a base station's ability to detect and receive the signal. Error correction codes techniques are applied in almost all digital systems as they provide better performance for dealing with the unwanted signal (noise). This research work has investigated the performance of hamming and convolutional coding techniques in mitigating error in GPS signal modeled in MATLAB/Simulink by transmitting randomly generated data through a Rayleigh fading channel. The performance metric employed in evaluating the system is Bit Error Rate (BER). The simulation results showed a comparison of the BER performance of the uncoded and coded signals (using Hamming and Convolutional coding techniques).

scholarly journals Operation of geodetic GNSS instruments under chirp signal L1 jamming

2021 ◽  
Vol 65 (02) ◽  
pp. 189-204
Author(s):  
Franc Dimc ◽  
Polona Pavlovčič Prešeren ◽  
Matej Bažec
Keyword(s):  
Global Positioning System ◽  
Signal To Noise Ratio ◽  
Satellite System ◽  
Signal Interference ◽  
Short Term ◽  
Global Positioning ◽  
Gnss Receivers ◽  
Global Navigation Satellite ◽  
To Receive

This paper presents the results of a vulnerability test of several geodetic Global Navigation Satellite System (GNSS) receivers in case of intentional signal interference in the frequency L1 for GPS (Global Positioning System). Nine instruments from different manufacturers (i.e., Leica Geosystems AG, Trimble Inc., Javad GNSS) were tested. The test was based on static and kinematic jamming. A static scenario with three-minute interruptions was followed by experiments with a stationary jammer located at distances from 10 m to 160 m from the receivers. For short-term kinematic interference, the jammer was installed in the vehicle, which passed the GNSS instruments at different speeds. An analysis of different scenarios showed that the jammer interrupted GPS but not GLONASS signals in certain situations. Since Galileo was not nominally operational at the time of the July 2019 measurements, only GPS and GLONASS were eligible for the study. The geodetic GNSS instruments reacted to the interruptions with a decreased signal-to-noise-ratio (SNR) and either with a complete inability to determine the code/phase position or with an incorrect calculation of phase ambiguities (initialization), which also affected the quality of the positioning. The proximity of the jammer played the most significant role in the complete inability to receive the signal; however, for the incorrect positioning longer duration of jamming was also a reason.

GPS and GSM Based Tracking System for Objects Moving over Wide Geographical Areas

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Fatima Ameen ◽  
Ziad Mohammed ◽  
Abdulrahman Siddiq
Keyword(s):  
Global Positioning System ◽  
Mobile Communications ◽  
Moving Objects ◽  
Tracking System ◽  
Geographical Area ◽  
Tracking Systems ◽  
Acceptable Result ◽  
Internet Service ◽  
Global Positioning ◽  
Tracking Objects

Tracking systems of moving objects provide a useful means to better control, manage and secure them. Tracking systems are used in different scales of applications such as indoors, outdoors and even used to track vehicles, ships and air planes moving over the globe. This paper presents the design and implementation of a system for tracking objects moving over a wide geographical area. The system depends on the Global Positioning System (GPS) and Global System for Mobile Communications (GSM) technologies without requiring the Internet service. The implemented system uses the freely available GPS service to determine the position of the moving objects. The tests of the implemented system in different regions and conditions show that the maximum uncertainty in the obtained positions is a circle with radius of about 16 m, which is an acceptable result for tracking the movement of objects in wide and open environments.

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