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Beidou Support?
Posted on 06 May, 2013 by LinJoe
Is there a time line on the Beidou Support? I noticed that there are no rinex3 support on Beidou and there are no beidou ephemeris handling available either?

could anyone comment?

thank you so much!

Lin

( comments ) last update by LinJoe 18 Apr 2014 - 01:44

Rinex cut-off angle
Posted on 25 Feb, 2014 by DanielMoreira
Hello

I´ m just started to use GPSTK!

I would like to know if it's possible to I generate from a RINEX and ephemerides file one new RINEX file with satellite cut-off angles of X degrees.

I tried to use two commands without success:

PRSolve --obs temp3320.09o --BCEpast temp3320.09n --forceElev --elev 30 --out test.13o

Exception: text 0:CommonTime objects not in same time system, cannot be compared: UNK = UTC location 0:/home/bparsons/git/gpstk/dev/lib/TimeHandling/CommonTime.cpp:362 location 1:/home/bparsons/git/gpstk/dev/apps/positioning/PRSolve.cpp:1185

and

ResCor? -IFtemp3321.09o --nav temp3320.09n --RAIM --MinElev 15 -OFteste

It's ok , but no cut-off was been applied,

Can anyone help me?

Thanks in advance

( comments ) last update by DanielMoreira 18 Mar 2014 - 17:59

RAIMSolverEmulateSingleFrequencyTrilateration
Posted on 21 Feb, 2014 by DomFuller
What is the best approach to emulating the position solution of a civilian hand held single frequency receiver using observations from a commercial grade dual frequency base station and RAIMsolver? To be clear, I would like a single frequency hand held receiver to calculate the same position as RAIMsolver using raw data from a collocated commercial base station.

I should probably:
1) Only use pseudo-ranges calculated from the coarse acquisition (C/A) signal.
2) Use observations from exactly the same set of satellites as the hand held receiver (no more, no less)
3) Use broadcast orbits (rather than sp3 ephemeris)

I’m not sure:
1) Is the trilateration method included in GPSTk the same as/similar to those used by hand held receivers?
2) Should I use the ionospheric parameters in the navigation file, an external empirical model, or no ionospheric correction at all?
3) Do hand held receivers apply first order meteorological/tropospheric corrections?
4) Pretty sure I can handle this part on my own, but I’ll need to force the positioning algorithm to use the same set of satellites as the hand held receiver. If the RINEX file contains no data for any one of the satellites, then throw an exception.

I'm not sure if this is the right place to post this sort of question...any comments and/or advise would be appreciated. Thanks!
( comments ) last update by DomFuller 27 Feb 2014 - 02:40

website suggestion
Posted on 01 Jul, 2013 by FelipeNievinski
The webpage <http://www.gpstk.org/bin/view/Documentation/WebHome> could have a link under the Applications section pointing to the User's Guide, <http://www.gpstk.org/bin/view/Documentation/UsersGuide>.
( comments ) last update by FelipeNievinski 19 Feb 2014 - 19:00

Wheresat range algorithm
Posted on 13 Nov, 2013 by ErlyLima
Does anybody know how is range algorithm that wheresat funtion uses when the user gives the antena position?
( comments ) last update by FelipeNievinski 19 Feb 2014 - 01:54

Archive
- Rinex cut-off angle
- RAIMSolverEmulateSingleFrequencyTrilateration
- Wheresat range algorithm
- how to specify time system in time format
- dashes in docs
- twiki "subscribe" plugin
- BuildingGPSTkUnderWindows
- unmodified vsvars32.bat posted
- Ambiguity Resolution Usage Example
- website suggestion
older articles

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