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Satellite navigation solution for the receiver's position (geopositioning) involves an algorithm.In essence, a GNSS receiver measures the transmitting time of GNSS signals emitted from four or more GNSS satellites (giving the pseudorange) and these measurements are used to obtain its position (i.e., spatial coordinates) and reception time.
GNSS-2 is the second generation of systems that independently provide a full civilian satellite navigation system, exemplified by the European Galileo positioning system. [5] These systems will provide the accuracy and integrity monitoring necessary for civil navigation; including aircraft.
GNSS enhancement refers to techniques used to improve the accuracy of positioning information provided by the Global Positioning System or other global navigation satellite systems in general, a network of satellites used for navigation. Enhancement methods of improving accuracy rely on external information being integrated into the calculation ...
Shadow matching (a.k.a. Shadow mapping) is a new positioning method that improves positioning accuracy of global navigation satellite systems (GNSS) in urban environments. The shadow matching positioning principle was first proposed and the name 'shadow matching' was first introduced by Paul D Groves. [ 1 ]
WGS 84 (G1762) is the sixth update to the WGS reference frame. [14] WGS 84 has most recently been updated to use the reference frame G2296, which was released on 7 January 2024 as an update to G2139, now aligned to both the ITRF2020, the most recent ITRF realization, and the IGS20, the frame used by the International GNSS Service (IGS). [16]
The US Nationwide Differential GPS System (NDGPS) was an augmentation system for users on U.S. land and waterways. It was replaced by [dubious – discuss] NASA's Global Differential GPS (GDGPS) system, which supports a wide range of GNSS networks beyond GPS. The same GDGPS system underlies WAAS and A-GNSS implementation in the US. [11]
Searching: finds locations with addresses or GNSS coordinates (latitude and longitude). Traffic updates: shows real-time traffic information, enabling the software to suggest a better route during driving. Offline map: allows regions of map to be pre-downloaded, enabling usage with minimal connectivity. Bookmarking: saves locations for later use.
The GPS gives an absolute drift-free position value that can be used to reset the INS solution or can be blended with it by use of a mathematical algorithm, such as a Kalman filter. The angular orientation of the unit can be inferred from the series of position updates from the GPS.