[FOSS-GPS] Mobile Robot Experimentation
fishloveocean at gmail.com
Thu Sep 18 00:50:29 PDT 2014
Dual frequency receivers could solve this problem. You need both the rover and the base station receivers to be dual frequency.
> On 18 Sep 2014, at 03:02, "Sean Hyde" <sean.a.hyde at gmail.com> wrote:
> Thanks for the responses! I apologize for breaking the thread, but I had turned on Digests by accident and couldn’t 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.
> 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 couldn’t utilize L2 as I had read a lot of information about using it in RTK setups. I’m 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 isn’t 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,
> 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 couldn’t 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 wasn’t accurate, as it was not repeatable.
> This message is sent to you from FOSS-GPS at lists.osgeo.org 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
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the FOSS-GPS