UAV Localization Using Inertial Sensors and Satellite Positioning Systems

2014 ◽  
pp. 433-460 ◽  
Author(s):  
Mitch Bryson ◽  
Salah Sukkarieh
Keyword(s):  
Inertial Sensors ◽  
Positioning Systems ◽  
Satellite Positioning

scholarly journals Research on BeiDou Satellite Positioning Algorithm Based on GPRS Technology

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Li Yang ◽  
Yunhan Zhang ◽  
Haote Ruan
Keyword(s):  
Real Time ◽  
Navigation System ◽  
Satellite Navigation ◽  
Positioning Systems ◽  
Time Dynamic ◽  
Satellite Navigation System ◽  
Satellite Positioning ◽  
Error Elimination ◽  
Wireless Module ◽  
Positioning Algorithm

The BeiDou Satellite Navigation System of China can provide users with high precision, as well as all-weather and real-time positioning and navigation information. It can be widely used in many applications. However, new challenges appear with the expansion of the 5G communication system. To eradicate or weaken the influence of various errors in BeiDou positioning, a BeiDou satellite positioning algorithm based on GPRS technology is proposed. According to the principles of the BeiDou Satellite navigation system, the navigation and positioning data are obtained and useful information are extracted and sent to the communication network through the wireless module. The error is corrected by establishing a real-time kinematic (RTK) mathematical model, and the pseudorange is calculated by carrier phase to further eliminate the relativistic and multipath errors. Based on the results of error elimination, the BeiDou satellite positioning algorithm is improved and the positioning error is corrected. The experimental results show that the positioning accuracy and efficiency of the algorithm can meet the actual needs of real-time dynamic positioning systems.

Klobuchar-Like Local Model of Quiet Space Weather GPS Ionospheric Delay for Northern Adriatic

2009 ◽  
Vol 62 (3) ◽  
pp. 543-554 ◽  
Author(s):  
Renato Filjar ◽  
Tomislav Kos ◽  
Serdjo Kos
Keyword(s):  
Space Weather ◽  
Weather Conditions ◽  
Ionospheric Delay ◽  
Delay Model ◽  
Northern Adriatic ◽  
Positioning Systems ◽  
Research Activities ◽  
Satellite Positioning ◽  
Klobuchar Model ◽  
The Impact

Ionospheric delay is the major source of satellite positioning system performance degradation. Designers of satellite positioning systems attempt to mitigate the impact of the ionospheric delay by deployment of correction models. For instance, the American GPS utilises a global standard (Klobuchar) model, based on the assumption that the daily distribution of GPS ionospheric delay values follows a biased cosine curve during day-time, while during the night-time the GPS ionospheric delay remains constant. Providing a compromise between computational complexity and accuracy, the Klobuchar model is capable of correcting up to 70% of actual ionospheric delay, mainly during quiet space weather conditions. Unfortunately, it provides a very poor performance during severe space weather, geomagnetic and ionospheric disturbances. In addition, a global approach in Klobuchar model development did not take into account particularities of the local ionospheric conditions that can significantly contribute to the general GPS ionospheric delay. Current research activities worldwide are concentrating on a better understanding of the observed GPS ionospheric delay dynamics and the relation to local ionosphere conditions.Here we present the results of a study addressing daily GPS ionospheric delay dynamics observed at a Croatian coastal area of the northern Adriatic (position ϕ=45°N, λ=15°E) in the periods of quiet space weather in 2007. Daily sets of actual GPS ionospheric delay values were assumed to be the time series of composite signals, consisting of DC, cosine and residual components, respectively. Separate models have been developed that describe components of actual GPS ionospheric delay in the northern Adriatic for summer and winter, respectively. A special emphasis was given to the statistical description of the residual component of the daily distribution of GPS ionospheric delay, obtained by removing DC (bias) and cosine components from the composite GPS ionospheric delay.Future work will be focused on further evaluation and validation of a quiet space weather GPS ionospheric delay model for the northern Adriatic, transition to a non-Klobuchar model, and on research in local GPS ionospheric delay dynamics during disturbed and severe space weather conditions.

TRACEABILITY AND THE CALIBRATION OF SATELLITE POSITIONING SYSTEMS

Survey Review ◽  
1998 ◽  
Vol 34 (269) ◽  
pp. 437-446
Author(s):  
M Stewart ◽  
M Tsakiri ◽  
D Martin ◽  
T Forward
Keyword(s):  
Positioning Systems ◽  
Satellite Positioning

GNSS-based Road User Charging

2004 ◽  
Vol 57 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Drazen Vrhovski ◽  
Terry Moore ◽  
Lloyd Bennett
Keyword(s):  
Field Tests ◽  
Tall Buildings ◽  
Spatial Location ◽  
Simulation Modelling ◽  
Urban Environments ◽  
Road User ◽  
Positioning Systems ◽  
Satellite Positioning ◽  
Recent Developments ◽  
Road User Charging

The last few years have seen a rapid growth of applications based on positioning information provided by satellite positioning systems. In transport management and control, satellite positioning has proven to be the most promising means for spatial location data collection. With the GPS modernisation programme well underway, and the recent developments of the Galileo project, even more GNSS-based applications are to be expected in the future. One such GNSS-based application is the use of position and velocity information as the prime input to a road user charging (RUC) scheme. However, navigation in urban environments raises a number of problems. Most important are the difficulties related to signal obstruction by features such as tall buildings, urban canyons, bridges and trees, as well as the effects of multipath caused by signal reflections from buildings and other vehicles. Given the inevitable limitations of road trials, the use of simulation modelling to assess the present and future satellite positioning systems' performance to support urban RUC seems indispensable. The main objective of the research undertaken at the University of Nottingham Institute of Engineering Surveying and Space Geodesy (IESSG), and the Nottingham Centre for Infrastructure (NCI), was to develop a tool to simulate GPS for Satellite Positioning-based Road User Charging (SPRUC). In this regard, an existing GPS simulator was modified to rectify one of its major weaknesses, namely the inability to address properly the change in non-static GPS measurements with respect to changes in built environment. For this purpose, state-of-the-art Geographic Information Systems (GIS) software was used to complement the simulator, and consequently a seamless interface between the two software has been developed. Finally, in order to provide a prime input to the simulator, field tests have been undertaken and significant amounts of GPS data were collected. Statistics were also derived for positioning accuracy and signal availability so that the results from the simulation modelling can be validated against those from the undertaken road trials.

Satellite Positioning Methods

2000 ◽  
Author(s):  
Vidal Ashkenazi ◽  
Chris Hill
Keyword(s):  
Doppler Shift ◽  
First Generation ◽  
Satellite Navigation ◽  
Navigation Systems ◽  
Similar System ◽  
Positioning Systems ◽  
Satellite Navigation System ◽  
Satellite Positioning ◽  
Satellite Navigation Systems ◽  
Processing Techniques

In the previous chapter, positioning was examined from a historical perspective, recognizing that in many parts of the world, such data are not just useful, they are frequently the only data available. But in many areas, the case for extending the limits of the continental shelf will be dependent on the acquisition of new data, and for the most part, this will mean the use of satellite navigation systems. Therefore, this chapter deals in some detail with current and future satellite navigation and positioning systems. The first generation of satellite navigation systems used the principle of the Doppler shift of transmissions from satellites to provide measurements of a user's position. The Doppler shift of an emitted signal is related to the relative velocity between the source of the signal and the point at which it is received. The apparent frequency of the received signal is increased when the emitter is moving toward the receiver, and decreased when it is moving away. This phenomenon can often be observed in everyday situations, such as when a vehicle drives past a pedestrian. The pitch of the sound from the vehicle appears to drop as it passes the pedestrian, due to the transition from increased to decreased frequency of the sound. In satellite Doppler systems, measurements of the Doppler shift of signals from the satellites are combined with knowledge of the satellite's position and velocity (its ephemeris), to give an indication of the receiver's position. TRANSIT was the first operational satellite navigation system (see chapter 7). Data-processing techniques were developed which allowed a receiver to be located with respect to another at a known location, to an accuracy of the order of 1 m. TRANSIT ceased operation as a position and timing system at the end of 1996. A similar system to TRANSIT was developed by the Soviet Navy in 1965. The system, known as TSIKADA, is still operational today (2000). Since satellite Doppler systems rely on the accumulation of measurements over a period of time to provide a useful measure of a receiver's position, they could not be used as true real-time satellite navigation systems (see chapter 7).

Hybrid GPS/GSM Positioning Systems Design with Fuzzy Logic

2008 ◽  
Vol 12 (3) ◽  
pp. 254-262
Author(s):  
Hsin-Yuan Chen ◽  
◽  
Chen-Hung Liu
Keyword(s):  
Fuzzy Logic ◽  
Mobile Communications ◽  
Systems Design ◽  
Satellite System ◽  
Positioning Systems ◽  
Main Research ◽  
Satellite Positioning ◽  
Switch Design ◽  
Gps Accuracy ◽  
New Applications

Global Positioning System (GPS) is based on a satellite system. Much work has been carried out on a non-satellite positioning systems using the existing Global System of Mobile Communications (GSM) infrastructure. This leads to a hybrid GPS/GSM positioning systems in the paper. We purpose to adopt GSM for positioning via an integrated switch design with fuzzy logic, if GPS lose efficacy. This induces four main research features in this paper. (1) Designs with optimal-based Fourier analyzer to achieve error of GPS decrease is presented. (2) New applications of fuzzy set theory are presented to solve the problem of GPS accuracy. (3) An integrated switch of fuzzy logic is designed for selecting GPS or GSM positioning systems. (4) Discussions on various GSM positioning methods are adopted with different error and location parameters of environment.

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