Navigation Satellite Constellations and Navigation Signals

2021 ◽  
pp. 13-34
Author(s):  
Kegen Yu
Keyword(s):  
Navigation Satellite ◽  
Satellite Constellations ◽  
Navigation Signals

Lower Bounds on DOP

2017 ◽  
Vol 70 (5) ◽  
pp. 1041-1061 ◽  
Author(s):  
Peter F. Swaszek ◽  
Richard J. Hartnett ◽  
Kelly C. Seals
Keyword(s):  
Lower Bounds ◽  
Global Navigation Satellite System ◽  
Satellite System ◽  
Navigation Satellite ◽  
Satellite Constellations ◽  
Dilution Of Precision ◽  
Gnss Positioning ◽  
Satellite Selection ◽  
Global Navigation ◽  
Global Navigation Satellite

Code phase Global Navigation Satellite System (GNSS) positioning performance is often described by the Geometric or Position Dilution of Precision (GDOP or PDOP), functions of the number of satellites employed in the solution and their geometry. This paper develops lower bounds to both metrics solely as functions of the number of satellites, effectively removing the added complexity caused by their locations in the sky, to allow users to assess how well their receivers are performing with respect to the best possible performance. Such bounds will be useful as receivers sub-select from the plethora of satellites available with multiple GNSS constellations. The bounds are initially developed for one constellation assuming that the satellites are at or above the horizon. Satellite constellations that essentially achieve the bounds are discussed, again with value toward the problem of satellite selection. The bounds are then extended to a non-zero mask angle and to multiple constellations.

scholarly journals Positioning systems: GNSS

2020 ◽  
pp. 11
Author(s):  
Constantino Valero Ubierna
Keyword(s):  
Error Correction ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Constellations ◽  
Positioning Systems ◽  
Satellite Systems ◽  
Agricultural Equipment ◽  
Dynamic Errors ◽  
Definition Of ◽  
Global Navigation Satellite

This topic will provide an overview of the technologies available for georeferencing machinery or any agricultural equipment on the Earth’s surface. Principles of GNSS (global navigation satellite systems) will be presented, along with current satellite constellations such as NAVSTAR GPS, GLONASS, Beidou, Galileo, etc. Error correction based on SBAS services and RTK technology. RTK networks. Definition of static and dynamic errors and accuracy.

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 Integrated Positioning System With Restricted Access to Navigation Satellite Signals

2017 ◽  
Vol 5 (1) ◽  
pp. 60-66
Author(s):  
Vasyl Kondratiuk ◽  
Eduard Kovalevskiy ◽  
Svitlana Ilnytska
Keyword(s):  
Mathematical Modeling ◽  
Antenna Array ◽  
Phase Difference ◽  
Navigation System ◽  
Cost Effective ◽  
Positioning System ◽  
Navigation Satellite ◽  
Restricted Access ◽  
Satellite Navigation System ◽  
Navigation Signals

Abstract Global satellite navigation system (GNSS) is by far the most cost-effective outdoor positioning technology currently available and used for many types of applications. In some cases a user may face difficult conditions, like restricted access to the navigation satellites due to natural or man-made phenomena. This paper presents an idea of an integrated positioning system capable of functioning under limited visibility conditions of navigation satellites. The system includes a digital antenna array, channels for converting radio navigation signals, a phase difference meter, a gyro platform with 3 gyros, an altimeter and a special calculator. With the help of mathematical modeling, the accuracy characteristics of the system are investigated by determining the coordinates of the carrier under conditions of a small number of available satellite signals.

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.

scholarly journals Hardware and Software Implementation for Global Navigation Satellite System Signal Processing by Temporary Accumulation Method to Monitor Radio-navigation Signals

2020 ◽  
pp. 1-16
Author(s):  
D. A. Eremeev
Keyword(s):  
Signal Processing ◽  
Signal To Noise Ratio ◽  
Small Scale ◽  
Navigation Satellite ◽  
Signal To Noise ◽  
Radio Navigation ◽  
Navigation Signal ◽  
Navigation Signals ◽  
Global Navigation Satellite ◽  
Accumulation Method

Currently, a scope of satellite radio-navigation applications is more and more extending. Accordingly, there are also increasing requirements for the quality of determining coordinates and time. Therefore, radio-navigation signals monitoring, in particular their waveform control, waveform distortion analysis, is a challenge. However, a power of navigation signals is lower than the noise level, therefore, the special methods and equipment, which provide increasing a signal-to-noise ratio, are necessary to analyze their waveform. Usually, complexes based on the large aperture antennas are used for this purpose. But they have a number of disadvantages, namely high complexity, high price, large size, necessity to guide and track each individual satellite.The paper gives a brief description of the temporary accumulation method (TAM). This method can be applied to signals containing repetitive elements (basic elements). Radio-navigation signals are such signals. TAM allows you to increase the signal-to-noise ratio and evaluate the waveform of signal basic elements by superimposing and averaging the appropriate signal samples. Gain increases with increasing accumulation time.The paper proposes a small-scale breadboard of the software-hardware complex to monitor signals of global navigation satellite systems (GNSS) based on an omnidirectional antenna, a software-defined radio system, and a personal computer. This breadboard allows recording of digital samples of the navigation signals observed, and then their processing by the temporary accumulation method.Presents operation estimates of the proposed breadboard for monitoring GNSS signals. Gives estimates of the GLONASS navigation signal waveforms in the time domain (signal basic elements) and in the frequency domain (energy spectrum). Also based on the use of TAM, estimates the signal power and energy gain. Proves that using the hardware-software complex proposed for radio-navigation signals monitoring is possible.The proposed scheme of the small-scale breadboard for monitoring GNSS signals can be used directly for monitoring and also to test various methods and technologies of navigation signal processing based on the use of information about the waveform of the received signal.

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.

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