scholarly journals GNSS Signal Tracking Performance Improvement for Highly Dynamic Receivers by Gyroscopic Mounting Crystal Oscillator

Sensors ◽  
2015 ◽  
Vol 15 (9) ◽  
pp. 21673-21695
Author(s):  
Maryam Abedi ◽  
Tian Jin ◽  
Kewen Sun
Keyword(s):  
Performance Improvement ◽  
Tracking Performance ◽  
Crystal Oscillator ◽  
Signal Tracking

Signal Tracking Performance Improvement of Spaceborne GNSS Receiver, GPS-12

2019 ◽  
Author(s):  
Eun-hyouek Kim ◽  
Hyeun-pil Jin ◽  
Soon-chun Lee ◽  
In-yong Park ◽  
Amer Mohammad Al Sayegh
Keyword(s):  
Performance Improvement ◽  
Tracking Performance ◽  
Signal Tracking ◽  
Gnss Receiver

A Side-Peak Cancellation Scheme for Unambiguous BOC Signal Tracking

2015 ◽  
Vol 764-765 ◽  
pp. 462-465
Author(s):  
Keun Hong Chae ◽  
Hua Ping Liu ◽  
Seok Ho Yoon
Keyword(s):  
Correlation Function ◽  
Correlation Functions ◽  
Numerical Results ◽  
Tracking Performance ◽  
Side Peak ◽  
Signal Tracking ◽  
Partial Correlations

In this paper, we propose a side-peak cancellation scheme for unambiguous BOC signal tracking. We obtain partial correlations using a pulse model of a BOC signal, and then, we finally obtain an unambiguous correlation function based on the partial correlations. The proposed correlation function is confirmed from numerical results to provide an improved tracking performance over the conventional correlation functions.

scholarly journals A statistical approach to estimate Global Navigation Satellite Systems (GNSS) receiver signal tracking performance in the presence of ionospheric scintillation

2018 ◽  
Vol 8 ◽  
pp. A51 ◽  
Author(s):  
Sreeja Vadakke Veettil ◽  
Marcio Aquino ◽  
Luca Spogli ◽  
Claudio Cesaroni
Keyword(s):  
Statistical Models ◽  
Statistical Approach ◽  
Global Navigation Satellite Systems ◽  
Tracking Performance ◽  
Ionospheric Scintillation ◽  
Navigation Satellite ◽  
Signal Tracking ◽  
Satellite Systems ◽  
Low Latitudes ◽  
Global Navigation Satellite

Ionospheric scintillation can seriously impair the Global Navigation Satellite Systems (GNSS) receiver signal tracking performance, thus affecting the required levels of availability, accuracy and integrity of positioning that supports modern day GNSS based applications. We present results from the research work carried out under the Horizon 2020 European Commission (EC) funded Ionospheric Prediction Service (IPS) project. The statistical models developed to estimate the standard deviation of the receiver Phase Locked Loop (PLL) tracking jitter on the Global Positioning System (GPS) L1 frequency as a function of scintillation levels are presented. The models were developed following the statistical approach of generalized linear modelling on data recorded by networks in operation at high and low latitudes during the years of 2012–2015. The developed models were validated using data from different stations over varying latitudes, which yielded promising results. In the case of mid-latitudes, as the occurrence of strong scintillation is absent, an attempt to develop a dedicated model proved fruitless and, therefore, the models developed for the high and low latitudes were tested for two mid-latitude stations. The developed statistical models can be used to generate receiver tracking jitter maps over a region, providing users with the expected tracking conditions. The approach followed for the development of these models for the GPS L1 frequency can be used as a blueprint for the development of similar models for other GNSS frequencies, which will be the subject of follow on research.

Carrier Tracking Performance Comparison of Standards and the Square-Root Kalman Filter

2012 ◽  
Vol 239-240 ◽  
pp. 1188-1193
Author(s):  
Shao Jie Ni ◽  
Jing Pang ◽  
Xiao Mei Tang ◽  
Fei Xue Wang
Keyword(s):  
Kalman Filter ◽  
Engineering Design ◽  
Performance Comparison ◽  
Tracking Performance ◽  
Square Root ◽  
Signal Tracking ◽  
Tracking Method ◽  
High Carrier ◽  
Comparison Of Standards ◽  
Lock In

In order to solve the problem of loosing lock in weak GPS signal tracking, Kalman filter based carrier tracking method is presented.In this paper,two methods to track the GNSS carrier are compared,one is base on normal Kalman filter, another is based on square-root Kalman filter. The paper analyzes the under performance in the low carrier-to-noise ratio, and the expenditure of the actual project exists, but the high carrier to noise less discussed than the case will appear.The analyse and simulation result can be used to guide the engineering design of the GNSS receiver.

scholarly journals Comparative Study of DE, PSO and GA for Position Domain PID Controller Tuning

2021 ◽  
Author(s):  
Puren Ouyang ◽  
Vangjel Pano
Keyword(s):  
Performance Improvement ◽  
Pid Controller ◽  
Robotic Manipulators ◽  
Tracking Performance ◽  
Contour Tracking ◽  
Fitness Functions ◽  
Performance Indexes ◽  
Pid Controller Tuning ◽  
Optimal Gains ◽  
Better Than

Gain tuning is very important in order to obtain good performances for a given controller. Contour tracking performance is mainly determined by the selected control gains of a position domain PID controller. In this paper, three popular evolutionary algorithms are utilized to optimize the gains of a position domain PID controller for performance improvement of contour tracking of robotic manipulators. Differential Evolution (DE), Genetic Algorithm (GA), and Particle Swarm Optimization (PSO) are used to determine the optimal gains of the position domain PID controller, and three distinct fitness functions are also used to quantify the contour tracking performance of each solution set. Simulation results show that DE features the highest performance indexes for both linear and nonlinear contour tracking, while PSO is quite efficient for linear contour tracking. Both algorithms performed consistently better than GA that featured premature convergence in all cases.

Unambiguous Composite BOC Signal Tracking Based on Partitioned Sub-Carriers

2015 ◽  
Vol 764-765 ◽  
pp. 535-539
Author(s):  
Keun Hong Chae ◽  
Hua Ping Liu ◽  
Seok Ho Yoon
Keyword(s):  
Correlation Function ◽  
Standard Deviation ◽  
Tracking Error ◽  
Numerical Results ◽  
Tracking Performance ◽  
Binary Offset Carrier ◽  
Signal Tracking ◽  
Partial Correlations ◽  
Error Standard Deviation

In this paper, we propose an unambiguous signal tracking scheme for composite binary offset carrier (CBOC) signal tracking. First, we obtain partitioned sub-carriers and partial correlations. Based on a recombination of the partial correlations, we propose a novel correlation function without side-peaks. From numerical results, the proposed correlation function is found to offer a better tracking performance than that of the conventional correlation function in terms of the tracking error standard deviation.

scholarly journals A Novel Virtual Sensor for Estimating Robot Joint Total Friction Based on Total Momentum

2019 ◽  
Vol 9 (16) ◽  
pp. 3344 ◽  
Author(s):  
Xu ◽  
Fan ◽  
Fang ◽  
Wang ◽  
Zhu ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Trajectory Tracking ◽  
Friction Model ◽  
Friction Torque ◽  
Joint Torque ◽  
Tracking Performance ◽  
Step Response ◽  
Virtual Sensor ◽  
Joint Friction ◽  
Velocity Tracking

Robot joint friction is an important and complicated issue in improving robot control performance. In this paper, a virtual sensor based on the total generalized momentum concept is proposed to estimate the total friction torque, including both the motor-side and link-side friction, of robot joints without joint torque sensors. The proposed algorithm only requires a robot joint dynamics model and not a complex friction model dependent on factors such as time and velocity. By compensating for the estimated friction torque with a robot joint controller, the trajectory tracking performance of the controller, especially the velocity tracking performance, can be improved. To verify the effectiveness of the developed algorithm, 2-DOF planar manipulator simulations and single-joint system experiments are conducted. The simulation and experimental results show that the designed virtual sensor can effectively estimate the total joint friction disturbance and that the controller trajectory tracking performance is improved after observed friction compensation. However, the position tracking performance improvement of the controller is less than that for the velocity tracking performance improvement during the experiments. In addition, the velocity step response ability and velocity tracking performance of the controller are improved more at low velocities than that at high velocities in the experiments. The proposed algorithm has engineering and theoretical significance for estimating robot joint friction and improving the performance of robot joint controllers.

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