- 期刊
- OpenAccess
Improving single-epoch RTK positioning under higher ionospheric influences using GNSS measurements
摘要
The key to achieve GNSS single-epoch real-time kinematic (RTK) positioning depends on successful instantaneous ambiguity resolution (AR). However, the ionospheric delay is a major error source to affect instantaneous AR. The current BeiDou System (BDS) of China has five geostationary earth orbit (GEO) satellites. These satellites are almost motionless over the equator and can transmit measurements without ionospheric spatial variations. Thus, we develop a mixed method, based on the advantage of the GEO satellites that can rid of ionospheric spatial variations, to decrease the effects of ionospheric delays and to improve the availability of single-epoch RTK positioning in mid-low latitude regions during the period of active ionosphere. Experimental baseline data (＜5 km) were collected at noon and in the afternoon (during high ionospheric influences) with Trimble NetR9 in the low-latitude region (Taiwan). The baseline data are tested with the mixed method and generalized methods for the availability of the single-epoch positioning. By comparing the results, it indicates that the combined GNSS performs better than stand-alone GPS. Under high ionospheric influences, the mixed model can produce more reliable and robust results.
延伸閱讀
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