Comment by Simon Wood on February 23, 2011 at 2:03pm

Having 'spoken' with Tomoji regarding the SDR GPS, this is intended for the 2.5.0 release. If you refer back to about October last year you will see that the SDR GPS will take a fair chunk of processing power.

 

RTK GPS is currently obtainable with the Ublox and SkyTraq receivers, and of course the much more expensive commercial/survey GPS.

Comment by Hamish on February 23, 2011 at 5:25pm

i like not depending on GPS for when my foamie makes it to mars :P

Comment by bcr on February 23, 2011 at 10:04pm

"Eliminate" iff the weather is perfect and you're in a wide open space with no multipath. In reality, you'll still want to fuse this with traditional sensors.

Comment by wahaha686 on April 10, 2011 at 10:38pm

I think Max2769 requires "Spot" Software (GPS baseband processing software), developed by Royal Philips Electronics.

The first page of the following PDF on Max2769 brings up the "Spot" Software
http://pdfserv.maxim-ic.com/en/ej/EJ63.pdf

The following article also mentions this "Spot" software
http://www.maxim-ic.com/company/press_room/product.cfm/id/1124


Anyone know how where we can download this software?
My Google search didn't turn up anything.

Comment by Jack Crossfire on April 10, 2011 at 11:05pm

For converting the baseband data to navigation solutions, there's fastgps: http://sourceforge.net/projects/fastgps/

 

Converting the baseband data to a format fastgps expects & linking fastgps to rtklib are the obvious missing pieces, but probably lawsuit bait.

 

Getting enough CPU power into an aircraft to process it is still cost prohibitive.  The most economical solution is to use a $40 uBlox 5 on the aircraft & just run fastgps + rtklib on the ground, to generate DGPS corrections.  That should give highly accurate 4Hz navigation.  The problem is getting RTCM messages out of rtklib, & then fighting the lawsuits.

 

An RTK GPS system for under $100 is the kind of disruption that drew lawsuits from Fraunhoffer, in the 1990's, over mp3 encoders.  Nobody wants to put any missing pieces in the libraries that might awaken Novatel or uBlox.

 

 

Comment by wahaha686 on April 11, 2011 at 11:18am

@ Jack Crossfire

Could you explain why RTCM specifically would incite lawsuits?

My wild guess is that Novatel or uBlox has some patents on the process or technology.

Finding a LEGAL way to distribute such software to the open source community might be worth investigating. Just an optimist.

Comment by Simon Wood on April 11, 2011 at 11:34am

Remember that RTCM is just a compression scheme for the Psuedorange/Phase/other data, you could just as easily send uBlox binary protocol over a link (of sufficient bandwidth/reliability).

 

RTKLib does have a future feature of RTCM out... just needs to be coded ;-)

Comment by wahaha686 on April 11, 2011 at 12:35pm

For hardware, are there any dual frequency GPS RF front-end on the market?

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