| Summary: | 碩士 === 國立成功大學 === 測量及空間資訊學系 === 107 === Real-time kinematic (RTK) positioning can achieve high-accuracy (centimeter level) positioning results. With the rapid development of global navigation satellite systems (GNSS), GNSS-RTK has been widely used in many fields, such as mobile mapping and autonomous driving. However, for high-accuracy GNSS-RTK positioning, the scope of its application is still limited by the cost. Thus, it has been long expected that high-accuracy positioning with low-cost GNSS receivers shall be realized. In the past, most low-cost GNSS receivers only produced single frequency signals. With the advance in technology, low-cost dual-frequency GNSS receiver has come into the market. In this study, we use a low-cost Allystar GNSS receiver to process dual-frequency measurements from GPS, QZSS, and Beidou. Positioning performances achieved by using the low-cost receiver are evaluated and then compared to those achieved by using a geodetic-grade GNSS receiver. With static and kinematic experiments, it can be concluded that (1) the low-cost Allystar receiver is able to provide good quality carrier phase measurements on GPS L1, QZSS L1, Beidou B1 and B2 frequencies, and the precisions of the carrier phase measurements on these frequencies are 1mm. (2) in the static test, RTK solutions using the low-cost Allystar receiver can achieve centimeter level accuracy, the positioning performance can be comparable to those of a high-grade geodetic receiver. (3) antenna quality is an important issue for RTK performance of the Allystar receiver in the kinematic test. When the antenna equipped by the Allystar receiver degrades from a high-grade to a low-cost antenna, frequent cycle slips are detected, the percentage of successful ambiguity resolution decreased significantly and less than 50% of the positioning solutions can achieve centimeter-level accuracy.
|
|---|
