scholarly journals Remote sensing of atmosphere and underlying surface using radiation of global navigation satellite systems

2017 ◽  
Vol 17 (4B) ◽  
pp. 1-7
Author(s):  
Nguyen Xuan Anh ◽  
Lutsenko V. I. ◽  
Popov D. O. ◽  
Cong Pham Chi ◽  
Trung Tran Hoai
Keyword(s):  
Mapping Function ◽  
Global Navigation Satellite Systems ◽  
Underlying Surface ◽  
Tropospheric Delay ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
New Methods ◽  
Global Navigation ◽  
Navigation Signals ◽  
Global Navigation Satellite

This paper is devoted to solving the problem of atmosphere diagnosis using radiation of the global navigation satellites. New methods for diagnosing the meteorological situation, the refractive state of the troposphere and underlying surface based on the behavior of navigation signals are proposed. The model of the mapping function that takes into account the sphericity of the troposphere and allows more accurate describing of the actual values for the tropospheric delay is proposed.

scholarly journals Formation Algorithms and Properties of Binary Quasi-Orthogonal Code Sequence of Modern Satellite Systems

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1205
Author(s):  
Vladimir Petrovich Pashintsev ◽  
Igor Anatolyevich Kalmykov ◽  
Aleksandr Pavlovich Zhuk ◽  
Dmitrii Viktorovich Orel ◽  
Elena Pavlovna Zhuk
Keyword(s):  
Correlation Function ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Navigation Signal ◽  
Global Navigation ◽  
Navigation Signals ◽  
Global Navigation Satellite ◽  
Orthogonal Code ◽  
Element Series

Increased number of threats to user interface of navigation signals, mainly in the form of suppression of navigation signals by jamming as well as navigation signal spoofing by false signals, assumes development of counter measures including improvement of structure security of navigation signals on the basis of stochastic use of code sequences which are ranging codes. This article proves the required number of unique discrete code sequences which can improve structure security of navigation signal in global navigation satellite system upon their stochastic use. Properties of discrete quasi-orthogonal code sequences are estimated which are used and proposed for use in global navigation satellite systems with channel code division, they are compared with optimum values of code balancing, number of element series and lower bounds of maximum lateral peaks of aperiodic auto-correlation function and maximum peaks of aperiodic mutual-correlation function. The experimental results show that the minimum values of the considered correlation functions of discrete quasi-orthogonal code sequences of known global navigation satellite systems exceed the lower bound by 3–6 times. The performances of code balancing and element series of discrete quasi-orthogonal code sequences of the known global navigation satellite systems satisfy in average the allowable intervals. The number of source lines of discrete quasi-orthogonal code sequences of the known global navigation satellite systems is significantly lower than their umber required for improvement of structure security of navigation signal based on their stochastic use. On the basis of the revealed drawbacks of the known discrete quasi-orthogonal code sequences, the necessity to develop new methods is substantiated allowing to obtain their required number together with statistic properties comparable with the best values of discrete quasi-orthogonal code sequences applied as navigation signals in global navigation satellite systems.  

scholarly journals Optimizing Global Navigation Satellite Systems network real-time kinematic infrastructure for homogeneous positioning performance from the perspective of tropospheric effects

2020 ◽  
Vol 476 (2242) ◽  
pp. 20200248
Author(s):  
Chen Yu ◽  
Nigel T. Penna ◽  
Zhenhong Li
Keyword(s):  
Real Time ◽  
Global Navigation Satellite Systems ◽  
Transport Systems ◽  
Tropospheric Delay ◽  
Positional Error ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Real Time Kinematic ◽  
Global Navigation ◽  
Global Navigation Satellite

Real-time centimetre-level precise positioning from Global Navigation Satellite Systems (GNSS) is critical for activities including landslide, glacier and coastal erosion monitoring, flood modelling, precision agriculture, intelligent transport systems, autonomous vehicles and the Internet of Things. This may be achieved via the real-time kinematic (RTK) GNSS approach, which uses a single receiver and a network of continuously operating GNSS reference stations (CORS). However, existing CORS networks have often been established simply by attempting regular spacing or in clusters around cities, with little consideration of weather, climate and topography effects, which influence the GNSS tropospheric delay, a substantial GNSS positional error and which prevents homogeneous RTK accuracy attainment. Here, we develop a framework towards optimizing the design of CORS ground infrastructure, such that tropospheric delay errors reduce to 1.5 mm worth of precipitable water vapour (PWV) globally. We obtain average optimal station spacings of 52 km in local summer and 70 km in local winter, inversely related to the atmospheric PWV variation, with denser networks typically required in the tropics and in mountainous areas. We also consider local CORS network infrastructure case studies, showing how after network modification interpolated PWV errors can be reduced from around 2.7 to 1.4 mm.

Wireless technologies for road transport. Global navigation and positioning of vehicles

2017 ◽  
Author(s):  
Власов ◽  
Vladimir Vlasov ◽  
Мактас ◽  
Boris Maktas ◽  
Богумил ◽  
...  
Keyword(s):  
Satellite Navigation ◽  
Road Transport ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Time Dimension ◽  
Satellite Systems ◽  
Satellite Navigation System ◽  
Global Navigation ◽  
Navigation Signals ◽  
Global Navigation Satellite

The textbook outlines the topics included in the "RPD 3+" educational program, including: - technology of satellite navigation to monitor and control the movement of road transport; - positioning technology for road transport; - technology of forming and processing of navigation signals of GLONASS and GPS global navigation satellite systems; - comparative characteristics of global navigation satellite systems GLONASS and GPS; - the time dimension in satellite navigation system. The influence of the receiver’s clock error on the accuracy of an object location measurement.

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