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does example5 work fine in gpstk version 2.9
Posted on 04 Aug, 2017 by TrekLin

| example5 builds fine, but could not execute properly, the path and file names of the input arguments are all correrct, but the program complained "

Problem opening file bahr1620.04n Maybe it doesn't exist or you don't have proper read permissions.",

I verified that gpstk version 2.0 had no such issues. | ( comments ) last update by TrekLin 04 Aug 2017 - 05:57

Using gnssrinex for rinex3 obs files
Posted on 13 Jul, 2017 by GuillermoCentelles

|

Hello,

I started my project using Rinex files version 2. Then I computed multipath through gnssrinex class, because I want separated arcs and avoid cycle slips (I think it is the easiest way to do it). My problem is that I want to develop the tool for Galileo and from now I need to use Rinex version 3, and gnssrinex does not accept rinex version 3. Any suggestion?

Thank you very much,

Regards

| ( comments ) last update by GuillermoCentelles 13 Jul 2017 - 09:36

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 https://celestrak.com/GPS/almanac/Yuma/2016/

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: http://cddis.nasa.gov/Data_and_Derived_Products/GNSS/broadcast_ephemeris_data.html

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 AdminRickMach 12 Apr 2017 - 19:22

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?

Regards

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

Archive
- does example5 work fine in gpstk version 2.9
- Using gnssrinex for rinex3 obs files
- 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
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Topic revision: r13 - 26 May 2014, RickMach
 

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