Shelby H. Griggs PLS, post: 411802, member: 335 wrote: RFinder has released the radio/phone AFAIK. I have not seen one of these in person, but the idea is a single Android device has both a phone and a two way radio, this radio is specifically geared toward the Digital Mobile Radio (DMR) flavor of digital two way radios. There is getting to be quite the DMR repeater infrastructure on both commerical and amatuer sides, what this device brings is ease of use, via a database and built in GPS it will show you what repeater is close and set all the settings automatically. Many of the DMR repeaters are linked via internet, so you can actually talk to any other user anyplace, even other side of world if you are both on the same network, the key is keeping all the database data current, so this device makes that easier. This device is geared toward amatuer use so you couldn't use the radio part without an amatuer licnse nor could you use it for work unless you had a FCC business license AND it is Part 90 approved AND it is open to business frequencies. Most, if not all DMR commercial repeaters require paying a monthly fee to roam on the network. Here is one commercial offering in my area: http://www.daywireless.com/tower-services/trbowest.htm
A few other links about DMR and a video review of the RFinder device.
https://en.wikipedia.org/wiki/Digital_mobile_radio
http://www.livefromthehamshack.tv/2016/12/06/episode-70-rfinder-android-dmr-radio-review/
Thanks, that is interesting.
No DMR repeaters anywhere near my location so I guess if you wanted long range, you would have to connect to a repeater via the internet using the 3G internet.
I think at such a cheap price I would buy 2 just for the fun of it. Never know when they may come in use.
I believe many well known GNSS manufacturers (in precise positioning market) will face Polaroid destiny because of this https://developer.android.com/reference/android/location/GnssMeasurement.html&apos ;"> https://developer.android.com/reference/android/location/GnssMeasurement.html
it the just the beginning now but in a few years from now on it well be the disrupter.
ok, just realized that this manufacturer is a wrap around https://www.u-blox.com/en/high-precision-gnss-modules&apos ;">u-blox
looks like u-blox modules have built in RTK algorithms now, a few years ago it was not the case.
gschrock, post: 412118, member: 556 wrote: You speak the truth 🙂
ufortunately in my case :), because my gnss hobby just left a hobby (... I wanteed it to be a really small business) 😉
Yuriy Lutsyshyn, post: 412120, member: 2507 wrote: ok, just realized that this manufacturer is a wrap around https://www.u-blox.com/en/high-precision-gnss-modules&apos ;">u-blox
looks like u-blox modules have built in RTK algorithms now, a few years ago it was not the case.
Please correct me if I'm wrong, but internally they feed the base (RTCM3 or what have you) observables and rover (u-blox raw) observables into RTKLIB for RTK positioning. I'm not certain what version of RTKLIB they're using or if it's a custom modified version.
astrodanco, post: 412163, member: 7558 wrote: Please correct me if I'm wrong, but internally they feed the base (RTCM3 or what have you) observables and rover (u-blox raw) observables into RTKLIB for RTK positioning. I'm not certain what version of RTKLIB they're using or if it's a custom modified version.
Hi, yes the procedure would be like you described but I did not read their manuals to see if they are using RTKLIB or their own RTK processing
I think I misunderstood you (lost in translation :). It looks like ublox modules do the RTK processing themselves, they already have their own rover raw data they just need base raw data. I am still not sure if ublox modules run RTKLIB internally or they have their own RTK processing. I believe all Reach does is to supply base raw data (in RTCM or their own ublox format) into ublox module.
Yuriy Lutsyshyn, post: 412217, member: 2507 wrote: I think I misunderstood you (lost in translation :). It looks like ublox modules do the RTK processing themselves, they already have their own rover raw data they just need base raw data. I am still not sure if ublox modules run RTKLIB internally or they have their own RTK processing. I believe all Reach does is to supply base raw data (in RTCM or their own ublox format) into ublox module.
I don't think u-blox has yet put an RTK engine in their GNSS modules. U-blox does have a chip that does PPP, but it converges very slowly and is not super accurate. Newer u-blox firmware can also input old style RTCM and do DGPS positioning, but not RTK positioning. The Reach contains a separate processor on which they run RTKLIB to do the real time positioning calculations. That's where the RTK processing takes place.
I was trying to evaluate the utility of this and the new Piksi from users posts as well for similar need. We are carrying out several research projects involving volume calculations using UAV imagery for which we need survey grade GPS / GNSS accuracy for our Ground Control Points. Right now we are working on very limited budget and are beg/borrow/steal-ing access to Dual channel commercial RTK equipment from government and industry partners. We are quickly hitting a point where we need to operate our own equipment. We do not need RTK, and can post process our corrections.
I have read about Reach and Piksi, but I do not need to go that low cost, and also want something fairly turnkey. I am not looking to integrate any of this into the UAV's, just capture accurate readings for my GCPs. I have been trying to find the answers to following questions:
- Is there a solution I am not turning up that is affordable ($2000-$4000) that does this?
- If not does anyone have experience with Reach or Piksi in the field?
- Has anyone evaluated the above against other high end field equipment?
We are working in remote Arctic and high Arctic conditions so some robustness and reliability is required. We are teetering on just waiting it out and looking for funding for a lower end commercial setup as it looks like 2k for the new Piksi setup, without a lot of confidence it will not represent a substantial drain on staff figuring it out even if it does work as advertised. That said, I like the idea of attempting to validate it against other equipment.
astrodanco, post: 412318, member: 7558 wrote: I don't think u-blox has yet put an RTK engine in their GNSS modules
I do not know what u-blox means when they say a word RTK, but this https://www.u-blox.com/en/product/neo-m8p&apos ;">link is about their meaning of RTK. Is it PPP RTK or DD RTK (Double Differences RTK model) ? - I do not know.
Yah I was wrong assuming reach rs is relaying on u-blox RTK only, the reach rs runs rtklib on linux single board computer - the Edison, and this deribes all what is in the reach rs wrap is about:
"The Reach* hardware platform consists of three components: an Intelå¨ Edison computer running a custom, Yocto*-built, Linux* operating system and RTKLIB; a U-blox GPS-receiver; and an external Tallysman antenna" source: https://software.intel.com/en-us/articles/reach-intel-edison-based-device-is-making-highly-precise-gps-affordable-for-everyone&apos ;">here
u-blox's own RTK is DD-RTK.
Reach-RS uses a less expensive non-RTK u-blox chip and relies on RTKLIB for DD-RTK.
Would reach rs would be good for low cost static receivers? The base rover communication seems awesome. As is using android devices as controller.
I've been using cheaper Chinese brand gnss rtk with trimble board, pacific crest radio internal for nearly three years. One issue needing support, base radio changed under warranty. Once set up no support needed. Well and truly paid off now.
Considering upgrade soon.
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I learned the hard way (as in wallet) that swift uses their own proprietary protocol and then others write programs in their freetime to make it cross to traditional ones like rctm and then there is problems but what can you expect for free software. Ublox on the other hand will usually come out with the same device with more standard usable protocols (rinex) a short time later and cheaper. My first version swifts sit in a box and I still use the Ublox units.