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GPS Standard Formats Kể từ khi cá nhân GPS nhà sản xuất có định dạng độc quyền của họ cho lưu trữ các phép đo GPS, nó có thể được khó khăn để kết hợp dữ liệu từ máy thu khác nhau. Một vấn đề tương tự gặp phải khi giao tiếp thiết bị khác nhau, bao gồm hệ thống GPS. Để khắc phục những hạn chế này, một số các nhóm nghiên cứu đã phát triển định dạng tiêu chuẩn cho các nhu cầu của người sử dụng khác nhau. Chương này bàn về các định dạng chuẩn được sử. | 8 GPS Standard Formats Since individual GPS manufacturers have their own proprietary formats for storing GPS measurements it can be difficult to combine data from different receivers. A similar problem is encountered when interfacing various devices including the GPS system. To overcome these limitations a number of research groups have developed standard formats for various user needs. This chapter discusses the most widely used standard formats namely RINEX NGS-SP3 RTCM SC-104 and NMEA 0183. 8.1 RINEX format To save storage space proprietary formats developed by GPS receiver manufacturers are mostly binary which means that they are not directly readable when displayed 1 . This creates a problem when combining data in the postprocessing mode from different GPS receivers. To overcome this problem a group of researchers have developed an internationally accepted data exchange format 1 . This format known as the RINEX format is in the standard ASCII format i.e. readable text . Although a file in 101 102 Introduction to GPS the ASCII format is known to take more storage space than a file in the binary format it provides more distribution flexibility. A RINEX file is a translation of the receiver s own compressed binary files. A draft version of the RINEX format was introduced in 1989 followed by a number of updates to accommodate more data types e.g. GLONASS data and other purposes 1 . The current RINEX version 2.10 defines six different RINEX files each contains a header and data sections 1 observation data file 2 navigation message file 3 meteorological file 4 GLONASS navigation message file 5 geostationary satellites GPS signal payloads data file and 6 satellite and receiver clock data file. A new version 2.20 is currently proposed to accommodate data from low Earth orbit LEO satellites equipped with GPS or GPS GLONASS receivers 2 . For the majority of GPS users the first three files are the most important and therefore will be the only ones discussed here. The .
