The global navigation satellite system provided by the Russian Federation. The nominal baseline constellation of GLONASS comprises 24 Glonass-M satellites that are uniformly deployed in three roughly circular orbital planes at an inclination of 64.8° to the equator. The altitude of the orbit is 19,100 km. The orbit period of each satellite is 11 hours, 15 minutes, 45 seconds. The orbital planes are separated by 120° right ascension of the ascending node. Eight satellites are equally spaced in each plane with 45° argument of latitude. Moreover, the orbital planes have an argument of latitude displacement of 15° relative to each other.
Published in Chapter:
Application of Computer Modelling in Adaptive Compensation of Interferences on Global Navigation Satellite Systems
Valerian Shvets (National Aviation University, Ukraine), Svitlana Ilnytska (National Aviation University, Ukraine), and Oleksandr Kutsenko (National Aviation University, Ukraine)
Copyright: © 2019
|Pages: 42
DOI: 10.4018/978-1-5225-7588-7.ch014
Abstract
Modern society is characterized by the increased use of global navigation satellite systems (GNSS), which is inseparably linked with the interference immunity ensurance. The most effective way to protect against interferences is an introduction into the receiver structure of adaptive interference compensators. However, the most of proposed methods have been designed for radiolocation and communication and use a priori information about the transmitted signal. Since as structure of GNSS signal differs from the radar and communication systems, GNSS does not know the time-frequency structure of the useful signal in advance, which excludes the possibility of using a number of widely known methods. In this chapter, the authors propose a method, which does not use a priori information about a useful signal, and a new direct method for calculating the inverse correlation matrix of interference in adaptive antennas of interferences compensators.