The use of Global Navigation Satellite Systems (GNSS) signals for remote sensing applications, generally referred to as GNSS-Reflectometry (GNSS-R), is gaining increasing interest among the scientific community as a remote sensing tool for land applications. This paper describes a long term experimental campaign in which an extensive dataset of GNSS-R polarimetric measurements was acquired over...

Three-dimensional water vapor can be reconstructed from Global Navigation Satellite System (GNSS) observations, which can study 3-D profile variations of atmospheric water vapor and climate. However, there is a large uncertainty of water vapor tomography from single GPS system observations due to limited satellites. The rapid development of multi-GNSS, including China’s Beidou Navigation Satell...

In this paper, the performance of real-time GNSS data distribution over a public packet switching network (such as the Internet) is assessed. It is expected that the provision of a suitable data format will allow users to take full advantage of the real-time GNSS data distribution system. Types of GNSS data supported, message sizes, data rates, data precision levels, hardware/software support, ...

Ultra-tight integration was first proposed by Abbott in 2003 with the purpose of integrating a global navigation satellite system (GNSS) and an inertial navigation system (INS). This technology can improve the tracking performances of a receiver by reconfiguring the tracking loops in GNSS-challenged environments. In this paper, the models of all error sources known to date in the phase lock loo...

Ground-based GNSS (Global Navigation Satellite Systems) have efficiently been used since the 1990s as a meteorological observing system. Recently scientists used GNSS time series of precipitable water vapor (PWV) for climate research. In this work, we use time series from GNSS, European Center for Medium-Range Weather Forecasts Reanalysis (ERA-Interim) data, and meteorological measurements to e...

SUMMARY Location-Based Services (LBS) cover a wide spectrum of applications including fleet management, travel aids, location identification, emergency services and vehicle navigation. Applications of this service can be further extended if reliable and reasonably accurate 3-dimensional positional information of a mobile device can be determined seamlessly in both indoor and outdoor environment...

A signal of opportunity (SOP)-aided inertial navigation system (INS) framework is presented and studied. The following problem is studied. A mobile receiver with access to global navigation satellite system (GNSS) signals is aiding its onboard INS with GNSS pseudoranges. While navigating, the receiver draws pseudorange observations on ambient unknown terrestrial SOPs and estimates the SOPs’ sta...

Future Global Navigation Satellite Systems (GNSS) like GALILEO or the modernised GPS will support “Safety of Life” (SoL) applications by the self-monitoring of the GNSS performance and by the provision of integrity information in dedicated services. The International Maritime Organisation (IMO A.915(22)) requires horizontal positioning accuracies better than 10 m in oceanic and coastal areas. I...

GNSS-controlled photogrammetry is a mature technology that has found near universal acceptance in the aerial mapping community. The current strategy for integrating photogrammetric and GNSS data is to first process the GNSS data using a stand-alone kinematic Kalman filter processor, and then to use the resulting positions as parameter observations in a photogrammetric bundle adjustment. The uti...