This paper describes a new software method called “averaging correlation” to do block level GPS C/A code acquisition and tracking in frequency domain with smaller FFT blocks. The method retains the signal to noise ratio observed in more expensive correlators. Frequency domain software processing will become more feasible and popular if this method is implemented in civil GPS receivers.

The International GPS Service (IGS) has provided GPS orbit products to the scientific community with increased precision and timeliness. Many users interested in geodetic positioning have adopted the IGS precise orbits to achieve centimeter level accuracy and ensure long-term reference frame stability. Currently, a differential positioning approach that requires the combination of observations ...

in this paper, we present a novel algorithm for vanet using cloud computing. we accomplish processing, routing and traffic control in a centralized and parallel way by adding one or more server to the network. each car or node is considered a client, in such a manner that routing, traffic control, getting information from client and data processing and storing are performed by one or more serve...

The impacts of ionospheric irregularities on precise point positioning (PPP) have been commonly noticed in the field ionosphere and application Global Navigation Satellite System. But few attentions paid to how deteriorate performance PPP. Aiming at exploring mechanism degradation PPP solutions during period irregularities, this paper investigates kinematic experiment uses GPS observation data ...

Abstract We carried out a statistical analysis of the propagation characteristics Es and Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) by combining data HF Doppler (HFD) sounder Total Electron Content (TEC) obtained from GPS receivers GEONET (GPS-TEC) for 4 years 2014 to 2017. made use reflection HFD in Sugito, Saitama (36.0°N, 139.7°E), Fujisawa, Kanagawa (35.3°N, 139.5°E), Sugadair...

The emerging Global Navigation Satellite Systems (GNSS) including the BeiDou Navigation Satellite System (BDS) offer more visible satellites for positioning users. To employ those new satellites in a real-time kinematic (RTK) algorithm to enhance positioning precision and availability, a data processing model for the dual constellation of GPS and BDS is proposed and analyzed. A Kalman filter-ba...

Recent seismic activity, possible induced, in the Gulf of Valencia or the intense underwater seismic activity associated with the eruption of El Hierro (2011-2012) shows the importance of controlling the seismicity located in the sea that is not covered by the terrestrial monitoring networks. To overcome this problem, this work propose the development of a “Wireless-based” Ocean-bottom Seismogr...

In this paper, we present the design of a Software Defined Radio (SDR) architecture that is used for geotagging camera images. In this architecture, only the radio frequency (RF) front-end of the SDR is installed on the camera to reduce the power required for collecting Global Positioning System (GPS) geolocation data. A brief snapshot of the GPS signals is collected when a picture is taken and...

Abstract The feasibility of precise real-time orbit determination low earth satellites using onboard GNSS observations is assessed six months flight data from the Sentinel-6A mission. Based on offline processing dual-constellation pseudorange and carrier phase measurements as well broadcast ephemerides in a sequential filter with reduced dynamic force model, navigation solutions representative ...

International Journal of Digital Earth is concerned with the science and technology of Digital Earth and its applications in all major disciplines. The journal has a wide range of interest, but the principal topics are: Digital Earth Framework, Digital Earth Applications, Digital Earth Architecture and Standards, Digital Earth and Earth Systems, Geoinformatics, Geo-spatial Science, Mobile Mappi...