Abstract
GPS modules have been used for various applications in recent years. Its early development came in parallel with the advancement of Unmanned Aerial Vehicle (UAV) technology. Nowadays, it is also used in in geographic information system (GIS) data acquisition/census, mapping surveys, structure stability monitoring systems and many other applications. GPS modules generally have several positioning features, including standard positioning service (SPS), static positioning, precise point positioning (PPP), post processing kinematic (PPK) and real time kinematic (RTK) GPS. GPS modules in general are only equipped with a microstrip-type antenna or better known as patch antenna. Results from related research show that GPS module with this type of antenna has sub meter accuracy when used for PPK or RTK GPS method. The use of geodetic antennas is very potential to increase GPS position accuracy by up to centimeter level. This paper discusses the evaluation of GPS module measurements with geodetic type antennas for precise positioning using RTK GPS. This paper is focused on the resolution of GPS cycle ambiguity that is often expressed by the term fixing ratio and the accuracy of measurement results obtained. To provide a comprehensive description of the performance of GPS module, in this research two types of GPS module were used; single and dual frequency. Both types of GPS modules were used to conduct simultaneous observation on an open and obstructed observation location.
Highlights
The use of GPS modules is increasing in parallel with the increasing need for positioning with reliable accuracy in affordable price
Positioning system provided in GPS module of this type is usually only in standard positioning service (SPS) or better known as absolute positioning, with accuracy ranging from 3-15 meters
This paper aims to evaluate the use of geodetic antennas for observation using GPS modules using post processing kinematic (PPK) and real time kinematic (RTK) methods
Summary
The use of GPS modules is increasing in parallel with the increasing need for positioning with reliable accuracy in affordable price. GPS module manufacturers offer products at relatively competitive low prices with attractive features for Its users. Skytraq, Emlid, Piksi and Tersus are some of the manufacturers that are becoming widely known by GPS module users in Indonesia. The price of GPS modules varies in the range of 25 USD to 3,500 USD, according to the specifications and features provided. GPS modules with a price range of 25-60 USD are generally equipped with single frequency sensors and provide only simple features. Positioning system provided in GPS module of this type is usually only in standard positioning service (SPS) or better known as absolute positioning, with accuracy ranging from 3-15 meters. GPS modules of this type are generally used for UAV and USV navigation guides. One of the example of GPS module for UAV / USV navigation guide module is Ublox NEO-6M
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