A Combination of Low-cost, Dual-frequency, Multi-GNSS Receiver and CORS Network for Precise Positioning Applications in Vietnam

Although Real-time kinematic (RTK) is a positioning technique with high accuracy at the centimeter level, the investment cost for this positioning technique is relatively high. To reduce the investment cost, low-cost, dual-frequency, multi-Global Navigation Satellite System (GNSS) receivers can be considered. In Vietnam, the Continuously Operating Reference Stations (CORS) network has operated and covered the whole country. Therefore, the combination of low-cost, dual-frequency, multi-GNSS receivers and the CORS network can make RTK positioning easier and less expensive. The aim of this study is to evaluate the potential of applying the RTK positioning technique using a low-cost, dual-frequency, multi-GNSS receiver and the CORS network in Vietnam. In this study, four positioning experiments were performed in static and kinematic modes, and at near and far locations in which the rover was about 3 km and 30 km from the CORS station, respectively. Experiments conducted near the CORS station gave good results with the average standard deviation of 0.2 cm for static positioning and average deviation of 2.2 cm for kinematic positioning, and the FIX rate of greater than 95%. Therefore, the experimental results show the excellent potential of RTK positioning using low-cost, dual-frequency, multi-constellation receivers with the CORS network in Vietnam.