GNSS augmentation

About: GNSS augmentation is a research topic. Over the lifetime, 2478 publications have been published within this topic receiving 28513 citations. The topic is also known as: SBAS & Satellite Based Augmentation System.

EGNOS: The First Step in Europe’s Contribution to the Global Navigation Satellite System

Abstract: Introduction The current capabilities of GPS and GLONASS, although very adequate for some user communities, present some shortfalls The lack of civil international control represents a serious problem from the institutional point of view In addition, there is a need for enhanced performance In particular, the civil-aviation requirements for the precision and nonprecision approach phases of flight cannot be met by GPS or GLONASS only Marine and land users may also require some sort of augmentation for improving GPS/GLONASS performance

Method and apparatus for a global navigation satellite system receiver coupled to a host computer system

Abstract: The present invention provides a global navigation satellite system (GNSS) receiver apparatus, such as a GPS receiver, operable with a host computer system equipped with a real time clock configured to provide a time signal to the GNSS receiver apparatus. The time signal is used to facilitate acquisition of navigation and global timing information through observation of satellite signals. The global timing information is used to adjust the time signal and/or the real time clock to improve subsequent acquisitions of navigation and global timing information.

Assisted gps signal detection and processing system for indoor location determination

Abstract: An assisted GPS signal detection and processing system enables an end user to obtain position information from satellite navigation signals in indoor environments that have excess signal attenuation. The system includes a master navigation signal receiver having an antenna disposed with clear sky access to a plurality of navigation satellites. The master navigation signal receiver receives satellite navigation signals from the plurality of navigation satellites, and relays an assisted satellite navigation signal to a plurality of end user signal receivers via a medium. The assisted navigation signal includes at least one of satellite location information, clock correction information, and frequency discipline information. The end user signal receivers each have an antenna for receiving the satellite navigation signals directly. The end user signal receivers are also coupled to the medium to receive the assisted navigation signal from the master navigation signal receiver. The satellite navigation signals received by the end user signal receivers via the antennas may be at least partially attenuated due to passing through physical structures. The end user signal receivers are able to recover end user position information from the attenuated satellite navigation signals by use of the assisted navigation signal.

Gps augmentation system

Abstract: A system providing information that augments the navigational data transmitted by GPS satellites by providing fast and long-term corrections, a user differential range error, a grid ionospheric vertical error, and ionospheric corrections. The augmentation system includes one or more reference stations (2) having two or more reference receivers that independently receive signals from the GPS satellites and transmit the received information to at least one master station (8). Each master station has a set of processors, designated as correction and verification processors, each configured to receive the output signal from one of the reference receivers and calculate a set of augmentation data from that output signal. The augmentation system compares the augmentation data produced by the correction processor to the augmentation data produced by the verification processor to validate operation of augmentation system and transmits the validated augmentation data to users of the system.

Real-Time Single Frequency Precise Point Positioning Using SBAS Corrections

Abstract: Real-time single frequency precise point positioning (PPP) is a promising technique for high-precision navigation with sub-meter or even centimeter-level accuracy because of its convenience and low cost. The navigation performance of single frequency PPP heavily depends on the real-time availability and quality of correction products for satellite orbits and satellite clocks. Satellite-based augmentation system (SBAS) provides the correction products in real-time, but they are intended to be used for wide area differential positioning at 1 meter level precision. By imposing the constraints for ionosphere error, we have developed a real-time single frequency PPP method by sufficiently utilizing SBAS correction products. The proposed PPP method are tested with static and kinematic data, respectively. The static experimental results show that the position accuracy of the proposed PPP method can reach decimeter level, and achieve an improvement of at least 30% when compared with the traditional SBAS method. The positioning convergence of the proposed PPP method can be achieved in 636 epochs at most in static mode. In the kinematic experiment, the position accuracy of the proposed PPP method can be improved by at least 20 cm relative to the SBAS method. Furthermore, it has revealed that the proposed PPP method can achieve decimeter level convergence within 500 s in the kinematic mode.