[time-nuts] GPS-SDR-SIM

[Bob kb8tq]

Hi

The GPS ephemeris stuff is in there as are the almanacs. They are in a weird location. 
Last time I grabbed them it took more looking than it should have. 

The gotcha is that all of them are for the past. If you are trying to test for future events,
they aren’t going to be of much use. Also the info you would need to simulate things
other than GPS is going to have to come from a different source …..(but still with the
same “past only” restriction). 

Bob

> On Mar 30, 2019, at 11:25 AM, jimlux <jimlux at earthlink.net> wrote:
> 
> On 3/27/19 11:49 AM, coderman via time-nuts wrote:
> 
> Compiled the software, but...
> 
>> he user specifies the GPS satellite constellation through a GPS broadcast ephemeris file. The daily GPS broadcast ephemeris file (brdc) is a merge of the individual site navigation files into one. The archive for the daily file is:
>> ftp://cddis.gsfc.nasa.gov/gnss/data/daily/
> 
> There's a ton of files under that.. broken down by year/day of year/ and then some subdirectories with dozens of files, that appear to be RINEX (the names are things like
> ftp://cddis.gsfc.nasa.gov/gnss/data/daily/2019/088/19f/USN700USA_R_20190880000_01D_CN.rnx.gz
> 
> A casual browse did not find the brdc.
> 
> 
> Here's the toplevel readme  - there's quite a few subdirectories in the archive that are not listed in the readme. suffix letters, g,h,i,k,l, etc.
> 
> **********************************************************************
>                   Welcome to the CDDIS GPS Archive
> 
>  The main directories are:
> 
> /campaign                   GPS data from selected campaigns
> 
> /daily/YYYY/DDD/YYd         Observation files for year YYYY and day DDD
>                             (Hatanaka format)
>                 /YYm        Met files for year YYYY and day DDD
>                 /YYn        Navigation files for year YYYY and day DDD
>                 /YYo        Observation files for year YYYY and day DDD
>                 /YYs        Summary files for year YYYY and day DDD
>                             (teqc output)
> /hourly/YYYY/DDD/HH         Hourly RINEX GPS files for year YYYY, day DDD,
>                             and hour HH; observation (Hatanaka format),
>                             navigation and met data
> 
> /high-rate/YYYY/DDD/YYd/HH  Observation files for day YYDDD and hour HH
>                             (Hatanaka format)
>                    /YYm/HH  Met files for day YYDDD and hour HH
>                    /YYn/HH  Navigation files for day YYDDD and hour HH
> 
> /satellite/SATNAME/YYYY/DDD GPS data from on-board GPS receivers for
>                             satellite SATNAME for year YYYY and day DDD
> 
>  /gps/products/ionex/YYYY/DDD    Daily IONEX products for year YYYY and
>                                  day DDD
>               /trop/WWWW         Weekly GPS troposphere products for GPS
>                                  week WWWW
>                    /YYYY         Yearly GPS troposphere products for year
>                                  YYYY
>                    /nrt/WWWW     Near real-time GPS troposphere products
>                                  for GPS week WWWW
>               /trop_cmp/YYYY/DDD Troposphere comparison results for year
>                                  YYYY and day DDD
>               /trop_new/YYYY/DDD New IGS troposphere product for year
>                                  YYYY and day DDD
>               /WWWW              Weekly GPS precise orbits, etc. for GPS
>                                  week WWWW
> 
> All files are archived in UNIX compressed format.
> 
> Contact Carey Noll (Carey.E.Noll at nasa.gov) for further information.
> **********************************************************************
> 
> The local date and time is: %T
> 
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