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rtklibexplorer / RTKLIB

A version of RTKLIB optimized for low cost GNSS receivers, especially u-blox receivers. It is based on RTKLIB 2.4.3 and is kept reasonably closely synced to that branch. This software is provided “AS IS” without any warranties of any kind so please be careful, especially if using it in any kind of real-time application.
http://rtkexplorer.com/
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There are differences between demo5_b34e and demo5_b34i in the analysis of obs observation data #390

Closed joseph-chunhui closed 3 months ago

joseph-chunhui commented 3 months ago

obs.zip OBS observation data is analyzed with demo5_b34e, showing that there is a cycle jump in GPS 2W, while analyzing the same file with demo5_b34i shows no cycle jump. What is the reason? demo5_b34e 微信截图_20240625113442 demo5_b34i 微信截图_20240625113527

rtklibexplorer commented 3 months ago

To see cycle slips in the observation file as reported by the receiver, the Cycle-Slip option in RTKPLOT should be set to "LLI Flag". This is the most common setting for this option and when used for your sample file does not indicate cycle slips when using either the b34e or b34i versions of RTKPLOT. If the Cycle-Slip option is set to "LLG" as you have done in your screenshots , RTKPLOT uses dual frequency geometry free linear combination to detect cycle-slips rather than using the receiver flags in the observation file. I have not used this option before but from your screenshots it appears that there was a bug in the 34e code that has been fixed in the b34i code. I don't know exactly which change to the code would have fixed this.