Method and apparatus, the elevation data from a contours table for gnss - positioning use

摘要

The present invention relates to locating systems and in particular a method and a device for carrying out of precision improvements in navigation calculations of a gps - receiver. According to a first aspect, the invention comprises a guiding a table of heights attributes for large cities and urban areas of the world (contours table) in the gnss - set of chips. The information in the table preferably comprise parallel of latitude, lengths degree of the city, together with heights attributes this cities, such as average, minimum, maximum height and region boundary, etc. additional information, such as by section gradient could also be stored in the table. If gps - signals in environments, such as the case are impaired, it is possible in accordance with further aspects of the altitude information obtained from the table and to improve the navigation solution are used.