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Is there a faster way to determine which SP3 files I need to download from the NGS site? Without having to convert Gregorian dates to GPS date/week/day?
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i think no way?ÿ
I wrote a quick program to convert the date to a DOY (day-of-the-year) and week number/day of the week. It also displays the DOY for the trimble 4700 week number affected receivers, I added that so that I know what the filename should be for a particular day when we use 4700/5700's, makes it easier to download when there are multiple files on the receivers.?ÿ
Total of 7 lines of code.?ÿ
Although I just realized I may need to change a parameter in there to account for the second week rollover (2048).
Which post-processing software package are you using? There are several that have automatic download tools. Import all of your static data, click the download tool, and it will pull orbits that envelop your observation window.
Otherwise I simply use the NGS GPS Calendar. At various times I used to log the Julian date and GPS week in the fieldbook to make it easier.
I like Rover83??s solution, I??d print and laminate it.
BTW, if you use the ??User Friendly CORS? page:?ÿ https://www.ngs.noaa.gov/UFCORS/ to download data, you can specify that you want an SP3 file along with the GPS data you are requesting. Can??t get much easier than that.
As it is always good to have a backup see: http://navigationservices.agi.com/GNSSWeb/?ÿ
This site provides the GPS week and day-of-week (numbered 0 to 6) within the calendar. In addition to day-of-year it also includes the number of weeks since the last GPS week rollover (as of today 19) and GPS seconds-of-week. The whole enchilada.
The computation of GPS week and day of week is actually a little tricky and uses the MJDs of significant dates for correct results. I like Dr B.J.Remondi??s approach. His C code is available in the GPS Toolkit page on the NGS site.?ÿ
Here??s the page showing possible entries:
Thanks for the replies. I was using GNSS Solutions from Spectra until the latest rollover when it hanged when loading raw data. Read somewhere here about a workaround but could not get it to work properly. That software has an auto SP3 download feature.
Currently using RTKLib for post processing and unfortunately it has no SP3 server connection.
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That site is definitely what I was looking for. Just enter gregorian dates instead of having to convert to GPS dates. Thanks
I have been using GNSS and downloading and processing one location at a time.
GNSS may close afterwards and I open it again and process a point and open it over and over to process each point.
Takes some time and still, it gives great results.
Over the past several days I have been experimenting with RTKLib and GNSS Sol results. I am now getting very similar results from the 2 using the same data sets. Problem is that RTKLib has too many options without the proper documentation regarding what & why & when to use each tick box. It seems it was written for a NASA scientist. This site helped in explaining what some of the options mean & when to use them.
https://rtklibexplorer.wordpress.com/2016/09/22/rtklib-customizing-the-input-configuration-file/
I think a few more days of running RTKLib & I will be ready to migrate to it as my default post processing software.
I have also found out that GNSS Sol has no problems when using data sets prior to the latest GPS second rollover. It is only for data sets that were observed after the April 6 date. Have not found any information on why this is so from Spectra.
