Absolute newbie- need help getting started

[kirill.pavlyuchuk]

Hi Eric,

@dronemapper23

Is there a tutorial on how to do this in Emlid’s support documents?

We don’t have a specific guide, but you can read our Support tip explaining this process.

@dronemapper23

Any idea why only 87% of the observations were used? The tutorial also says the orbits used in the computation should be either rapid or precise. The email I got says an “ultra-rapid orbit” was used. Any idea why an “ultra-rapid” orbit was used and precise or rapid orbits were not?

I need to look at your file and check its raw data quality before drawing any conclusions. You can send it via PM or contact us to support@emlid.com.

I assume that ultra-rapid orbit was used due to the fact that you uploaded the file right after the logging session. Rapid satellite ephemeris and clocks usually appear in such services at least in 24 hours, precise ephemeris may appear in a few days.

@dronemapper23

I can do this when the RS2+ unit is not over the base location? I am only entering the obtained coordinates for future use? So for example, if I enter the obtained coordinates in Emlid Flow while the RS2+ receiver and I are in my office I am not telling the RS2+ that it is currently over the spot where I logged the data?

If you want to proceed working in RTK, you need to input obtained coordinates once you place the base in the field. If you work in PPK, it’s enough to keep these coordinates and input them lately in Emlid Studio or another post-processing software.

@dronemapper23

It does not look like I can enter and save multiple base locations at the same time, so if I had multiple projects going on at the same time I would have to enter or re-enter the appropriate base location each time I wanted to use them?

If you have several fixed points with known coordinates at your survey area, you can add them manually in the project. When you place the base over one of these known points to collect your GCPs in RTK, you select a particular point from the project. In this case, you won’t need to input their coordinates each time: they are stored in the project.

@dronemapper23

If this is the case, I think it means I cannot use the same log file for both uploading to OPUS and Static Processing in Emlid Studio for the purpose of creating a new Known Point? Therefore I should choose which process I am going to use before starting logging?

To bypass it, you can record UBX log as backup. Reach will simultaneously log one RINEX file for OPUS with preset, and the UBX file, which you can convert into the RINEX in Studio. UBX file contains all the raw data, so you can adjust it to the software requirements. Emlid Studio will process converted RINEX file smoothly.

@dronemapper23

Also, when I set up my logging session I forgot to change the position mode to Static, so it was left on Kinematic. Does this mean my log file is inaccurate?

No, it doesn’t. This setting affects RTK mode, not logging.

@dronemapper23

Lastly, when I went to download CORS data from my nearest station (RNO1) no data was available from the last two weeks. Is this a normal thing to happen?

It depends on your NTRIP provider. As far as I know, some of them provide access to logs only via email requests.

@dronemapper23

When I request data from CORS I’m sure I need to ask for the same time frame as my logging session and the two files are automatically synchronized in Emlid Studio?

Yes, you’re right. If time intervals don’t match, Emlid Studio outputs SINGLE solutions. The same as if you process without the base log at all.

@dronemapper23

And therefore the update rate / sampling rate have to match as well?

It’s unnecessary, but you may struggle to get a FIX when the base has a large update rate, like 30 seconds. We receive such reports occasionally, so it’s better to keep the base and the rover on close update rates. For example, if the base has 1 Hz and the rover has 5 Hz, there should be no issues.