Ok, interresting. Is is working with the patch on both rover and base? I have tried with a setup, but I had had very bad results, especially when I moved. Attached is results I have had, and that with antennas as [1] with bias voltage on and half a meter of coax. The signal is great as far as I remember. I have LEA6T's also (maybe 4T), although I don't quite remember exactly, it is quite some time ago since I tried.
Attached is a post processed result. [1] http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526 2014-07-01 21:38 GMT+02:00 Anton Strydom <[email protected]>: > Hi Nick > > Yes I get a reasonable plot using that specific unit. However for what we > intend doing in the long term we will be using a different design helical > antenna that we are in the process of developing. > > The units in the photographs are only for testing and setting up but we get > good results. For communication we use cellular routers connected to Leica > GGO2 L1/L2 base or else we use 3D Robotics XBEE radios. On the roving unit I > use an ARM processor where I have 4 rs232 ports available. It works very > well and is very stable. > > The radios I use where i have no cellular coverage. > > Attached is a photograph of the base setup > > Regards > > Anton > > > On Tue, Jul 1, 2014 at 9:27 PM, Nick Østergaard <[email protected]> wrote: >> >> Hi Anton >> >> Really? You get by with that small patch antenna? Is that a good (green in >> rtkplot) RTK solution you get from that constant? >> >> Regards >> Another Nick >> >> Den 01/07/2014 21.11 skrev "Anton Strydom" <[email protected]>: >> >>> Hi Nick >>> >>> I have done a lot of testing with U-Blox LEA 6T at speeds of up to 120 km >>> / h. Lat & Lon does not appear to be a problem but elevation is a problem. I >>> paid the equivalent of $60 for the 2 receivers and ceramic patch antennas. >>> >>> They are accurate on base line up to 10km where after accuracy >>> drastically degrades. >>> >>> I do all my testing in real time and do not post process. >>> >>> If you want to I can speak to my supplier and see if they still have some >>> of the LEA 6T's in stock at the price I paid for them. >>> >>> Attached are photographs of the units I am using >>> >>> Regards >>> >>> Anton >>> >>> >>> On Tue, Jul 1, 2014 at 8:50 PM, Danny Miller <[email protected]> >>> wrote: >>>> >>>> It does work in moving. But signal problems do still make the position >>>> jump around, trees and buildings and an antenna's orientation changing can >>>> make an error happen. Antenna quality has a lot to do with that, too. >>>> >>>> RTKLib requires a GPS with RAW pseudorange outputs. The NV08C is a >>>> good, cheap one to do it: >>>> >>>> http://www.nvs-gnss.com/contacts.html >>>> >>>> Contact your local sales rep there- it was actually easy in my >>>> experience to order a couple from them, and oddly cheaper than Newark >>>> element 14, as well as quicker to ship. >>>> >>>> Danny >>>> >>>> >>>> On 7/1/2014 1:24 PM, Nick wrote: >>>> >>>> Hello, >>>> >>>> I am interested in getting an RTK GPS setup working for a moving >>>> vehicle, not fast, perhaps 10 mph. I would postprocess the data collected >>>> later, using data downloaded from a nearby station. >>>> >>>> My desire is to log elevation data every few seconds as the vehicle >>>> drives. I hope to achieve 10-20 cm accuracy for the position and the >>>> elevation. >>>> >>>> As I research RTKLIB, it seems like most information I come across is >>>> regarding a static location. Is my goal feasible to achieve this kind of >>>> accuracy as the vehicle moves? >>>> >>>> If so, can anyone recommend a good board to get me started? I'm hoping >>>> to be able to do this for under $200 (just one receiver since the base >>>> station is public) -- please give me a reality check if this is unlikely. >>>> Thanks, >>>> >>>> Nick >>>> >>>> >>>> >>>> _______________________________________________ >>>> This message is sent to you from [email protected] mailing list. >>>> Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your >>>> subscription >>>> For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS >>>> >>>> >>>> >>>> _______________________________________________ >>>> This message is sent to you from [email protected] mailing list. >>>> Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your >>>> subscription >>>> For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS >>> >>> >>> >>> _______________________________________________ >>> This message is sent to you from [email protected] mailing list. >>> Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your >>> subscription >>> For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS >> >> >> _______________________________________________ >> This message is sent to you from [email protected] mailing list. >> Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your >> subscription >> For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS > > > > _______________________________________________ > This message is sent to you from [email protected] mailing list. > Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your > subscription > For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS
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