In this paper, combined GPS and GLONASS positioning systems are discussed and some solutions have been proposed to improve the accuracy of navigation. Global Satellite Navigation System (GNSS) is able to provide position, velocity and time with respect to coordinated universal time. GNSS positioning is based on received satellite signals, so its performance is highly dependent on the quality of...

N O V E M B E R / D E C E M B E R 2 0 1 6 www.insidegnss.com The advent of multiple constellations provides the opportunity to eliminate geometry weakness as a source of satellite-based augmentation system (SBAS) unavailability. GPS users occasionally encounter areas where an insufficient density of satellites exists to support all desired operations. This most often occurs when a primary slot ...

Fixed GEO satellite communications are impaired by long RTTs (especially GEO) and the possible presence of packet losses on the satellite radio channels. Moreover, when the satellite receiver is mobile, short and long disruptions due to line of sight obstructions associated with the presence of shadowing can cause further performance deterioration. In this paper, we evaluate the impact of a dis...

A novel joint satellite-transmitter and ground-receiver (JSG) digital pre-distortion (DPD) (JSG-DPD) technique is proposed to improve the linearity power efficiency of space-borne active phased arrays (APAs) in low Earth orbit (LEO) satellite communications. Different from conventional DPD that requires a complex RF feedback loop, coefficients based on generalized memory polynomial (GMP) model ...

The article highlights the components of a laser navigation system and analyzes them. A mathematical model an optical formed by radiation source, transmission medium (space vacuum) receiver are constructed. technique for estimating energy characteristics photosensitive matrix orbiter's has been developed. Based on constructed technique, algorithm was developed calculating electron-optical lunar...

The positioning tecnique of global navigation satellite systm (GNSS) has become mature and also been applied to a variety of navigation vehicles, whether it be the application to ground vehicle ot aircraft. Nevertheless, the precision of GNSS is susceptible to intentional or unintentional factors such as interference or jammer, etc. The influences range from minor effect like the positioning pr...

Throughout the last decade, a trend towards the development of software-based Global Navigation Satellite System (GNSS) receivers has evolved in the fields of scientific research. Software-based GNSS receivers feature a high flexibility for the adaptation to several applications, serve as a development platform for studying new algorithms and techniques, and especially have the advantage of req...

Integrity is the ability of a system to let its users know whether the system is operating out of its specified performance limits. This paper analyzes two receiver-based methods for assuring the integrity of Global Positioning System (GPS) signals-in-space for the purpose of determining whether the methods can do the job satisfactorily. These methods are called the range comparison method and ...

Recent developments in smartphone technology have increased user demand for indoors applications. The Global Navigation Satellite System (GNSS) and the Inertial Navigation System (INS) are the two advanced systems for navigation technology. However, it is still difficult for GNSS to provide an accurate and practical navigation solution, especially in environments with little or no signal availa...

Abstract The use of CubeSats promises several advantages within a low economical budget margin for different missions. Nowadays, data transfer through optical channels (lasercom) is considered potential technology satellite wireless communications, providing in terms rate with lower energy consumption. However, main drawback the location Optical Ground Station (OGS). Therefore, an artificial vi...