Back To Overview

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 |


Add your comments to the Discussion
 
Hi, did you make any progress on this problem? I am experiencing the same issues.
Note however, that the User Guide does not mention Yuma as acceptable format for whereSat (but seems to work with it, producing strange results?)
PetrJonas 06 Mar 2017 - 06:35


#ComMents


Topic revision: r4 - 12 Apr 2017, AdminRickMach
 

This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki? Send feedback