Hi Antonio,
Im glad to hear you say this as the NV08C manufacturer makes a big deal of using this module to do this using RTKLIB and I was getting worried. The base station and the rover are much closer than 100m. -Sean From: [email protected] [mailto:[email protected]] On Behalf Of António Pestana Sent: Thursday, September 18, 2014 4:06 AM To: Open Source GPS-related discussion and support Subject: Re: [FOSS-GPS] Mobile Robot Experimentation If rover and base are close enough (say, no more than a few hundred meters apart) ionospheric refraction pseudoranges disturbances will be pretty much the same both for base and rover. Therefore mono-frequency observations will suffice. Antonio 2014-09-18 8:50 GMT+01:00 Yanqing <[email protected] <mailto:[email protected]> >: Dual frequency receivers could solve this problem. You need both the rover and the base station receivers to be dual frequency. Kind regards, Yanqing On 18 Sep 2014, at 03:02, "Sean Hyde" <[email protected] <mailto:[email protected]> > wrote: Thanks for the responses! I apologize for breaking the thread, but I had turned on Digests by accident and couldnt figure out how to reply to individual messages. I'm not sure what receivers you are using, but if it's this one: http://www.nvs-gnss.com/products/receivers/item/2-nv08c-csm.html it seems to be L1 only, not L1+L2. The antenna you are using covers 1574-1610 MHz, so while multi-system (GPS/Glonass) it is also L1 only. The GPS L2 frequency is quite a bit lower, at 1227.6 MHz. http://en.wikipedia.org/wiki/GPS_signals#Frequencies_used_by_GPS As far as I know, GPS L1+L2 receivers start around $750 used (eg. Trimble 4000ssi on ebay) and much more new. Hi John. I had completely overlooked the fact that the NV08C couldnt utilize L2 as I had read a lot of information about using it in RTK setups. Im rather new to GPS. My understanding is that without L2 I will not be able to get rid of ionospheric delay, which will increase error. Could this be why my system isnt performing as I hoped? Can I get away with using an L1+L2 receiver on the Base Station and not on the Rover? Did you try with simultaneous mode of ambiguity resolution and use a smaller min ratio to fix ambiguity, such as 2 or 1.5? Kind regards, Yanqing Hello Yanging. I tried instantaneous mode and it seemed much worse. My Float solutions oscillated by several meters (instead of a tens of centimeters with a drift) and I couldnt get a Fix. I tried reducing the ratio in the other modes. Although that got me a fix more easily, I was concerned that it wasnt accurate, as it was not repeatable. -Sean _______________________________________________ This message is sent to you from [email protected] <mailto:[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] <mailto:[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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