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Precision of orbit prediction with SatOrbitPropaga
Posted on 12 Jan, 2017 by EvgenyB

| Hello everyone!

Could you help me please. I use the GPStk for the prediction of satellite orbit. I use class SatOrbitPropagator. I have exact ephemeris for the Radarsat-1 satellite. I try to propagate ephemeris and i have big difference with exact coordinates. I see that coordinate mistakes increase very fast. For example: on 8 minutes i have difference 900 meters by X coordinate on 16 minutes i have difference 2100 meters by X coordinate ... on 112 minute i have difference 22200 meters by X coordinate.

I use standard integrator RKF78. I try to use different variation of orbit models(atmosphere, gravity, Solar radiation pressure, etc), but i have a same resulats(difference with using different models constitute some meters).

What precision of SatOrbitPropagator? Can i use SatOrbitPropagator for 112 minutes? | ( comments ) last update by EvgenyB 12 Jan 2017 - 11:48

GPSTk in Python
Posted on 27 Nov, 2016 by CrypTo

Hi to all,

few years ago was GPSTk project in C++ implemented. Now i see that Python parts are added to GPSTk.

I would like to understand what is the aim.

Should GPSTk be 100% in Python and in C++? Or should Python be the main branch? What brought to the decision to transfer the C++ code to Python?


| ( comments ) last update by CrypTo 27 Nov 2016 - 15:45

Not all apps found in the newest toolkit release
Posted on 01 Nov, 2014 by OndrejDaniel
Hello everyone, I could not find several GPSTk applications in the newest version of the toolkit, however, I could find them in an older version. To be more specific, for example the application 'wheresat' is not located in 'bin' directory in gpstk-2.5.linux.x86_64.tar.gz archive, however, I can find this application in gpstk-2.3.linux.x86_64.tar.gz archive. The same holds for other applications.

Could you please clarify what is the reason for that?

(The archives have been downloaded from

Thank you very much! Best regards Ondrej
( comments ) last update by AnthonyWillis 10 Nov 2016 - 19:27

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

- Precision of orbit prediction with SatOrbitPropaga
- GPSTk in Python
- 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
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Topic revision: r13 - 26 May 2014, RickMach

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