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Predicting Sattelite Positions - Wheresat
Posted on 28 Sep, 2016 by KasperGl

| Dear m8's

We are trying to create an NMEA Stream simulator that contains the "correct" predicted sattelite positions:

We are trying to use the wheresat tool for this purpose:

When using GPS Yuma almanacs from

W e can user wheresat for example:

wheresat -e yumafile.alm --pos="x y z" --start=""09/25/2016 00:00:00" --end="09/25/2016 23:59:00" --time="900" --prn="5"

this returns a listn and we can see when PRN 5 is in view and at what elevation it should be. -->Problem: It does not match reality at all! In real we see sats that should be invisible and oposit. (provided x y z Location is correct)

When using Rinex files from here:

wheresat -e brdc2710.16n --pos="x y z" --start=""09/25/2016 00:00:00" --end="09/25/2016 23:59:00" --time="900" --prn="5"

Wheresat crashes. Is the file corrupt or is there a problem with wheresat / ephreader?

So i am not sure to fllowing questios:

- what exact files do i have to use to predict Sattelite Positions for near future

- should it work with the Rinex Broadcast files?

- am I doing something wrong?

Id be happy for an advice! Regards and Thanks | ( comments ) last update by KasperGl 28 Sep 2016 - 10:36

ResCor not acknowledging -OF gpstk Ver. 1.2
Posted on 03 May, 2016 by BrettVel

| Hello there, I am currently encountering an error when running my rinex files through ResCor of gpstk Ver.1.2 in that when I attempt to use the command

ResCor "-IFdfdata02250.15o -OFionodata02250.15o --nav log02250.15n --Rxhere -AOSP -AOSR -AOEL -AOAZ -AOLOA -AOLO"

I receive

ResCor, part of the GPS Toolkit, Ver. 4.1 9/21/09 (ed. 3.5 6/21/2007), Run 2016/05/03 16:30:56 Errors found in command line input: Output file name required: use -OF<name> ...end of Errors

So I don't know what the particular issue is as I do have -OFionodata.15o in the command and I receive the same error report as if I didn't include that part at all so I was wondering if anyone here would be able to tell me what I can do to have this work properly. Any help is appreciated. |

( comments ) last update by BrettVel 03 May 2016 - 22:50

Problem using PRSolve with RINEX
Posted on 13 Apr, 2016 by JamesMower

| I am using version PRSolve (from gpstk-1.7.win32.exe) and am unable to process RINEX files generated from Trimble Pathfinder Office. I have successfully used the ephemeris and observation sample files that have been posted elsewhere on this wiki. When I run PRSolve on my own files like this: prsolve --obs orange.obs --nav orange.nav --useCA

I get: PRSolve, part of the GPS ToolKit, Ver 2.3 11/09, Run 2016/04/13 12:26:38 Opened log file prs.log Weighted average RAIM solution for file: orange.obs (84 total epochs, with 0 good, 84 rejected.) No data! PRSolve timing: 3.214 seconds.

I am using this version of gpstk because later versions returned errors such as this: Exception: text 0:CommonTime objects not in same time system, cannot be compared: UNK = UTC

Thanks for any thoughts on where to start looking. I can post the .nav and .obs files as needed. |

( comments ) last update by JamesMower 13 Apr 2016 - 16:23

installing and building gpstk on ubuntu
Posted on 25 Dec, 2015 by SermetOgutcu

| Hello everyone, I just installed gpstk-2.5.linux.x86_64 for linux 64 bit version. I'm having difficulty for installation and compiling. I tried this way as follows (from installation documentation)

I extracted tarball; tar -zxvf gpstk-2.5.linux.x86_64.tar.gz

I created build directory within gpstk folder; mkdir build

then I execute; cmake -DCMAKE_INSTALL_PREFIX:PATH=/path/to/install. B ut it gives error as follows; CMake Error: The source directory "/home/sorbilene/gpstk/gpstk-2.5.linux.x86_64/build" does not appear to contain CMakeLists.txt.

Could someone explain each necessary step for installation and compiling?


( comments ) last update by SermetOgutcu 25 Dec 2015 - 15:31

Ephemeries files at current day
Posted on 03 Jul, 2015 by FlavienRx

| Hello world !

I want to open ephemeries files and changed the date for the current date with RinEdit.exe.

How i can do it ? What is it the process ?

I am novice in GPS world but i want understand !

Thx a lot to read my post.

Flavien |

( comments ) last update by FlavienRx 03 Jul 2015 - 08:05

- Predicting Sattelite Positions - Wheresat
- ResCor not acknowledging -OF gpstk Ver. 1.2
- Problem using PRSolve with RINEX
- installing and building gpstk on ubuntu
- Ephemeries files at current day
- python bindings problems in 2.5
- Not all apps found in the newest toolkit release
- Problem with ModelObs
- Broadcast ephemeris problem
older articles

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Topic revision: r13 - 26 May 2014, RickMach

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