Instructions for do it yourself Ntrip

Have you already got the receiver you plan on using for the base?

No do not have the base yet . Still open to ideas

I read that already . I looking for total hardware to software instructions.

I've been playing with a Javad Triumph 1 receiver as a base, hardwired with an Ethernet cable to my cable modem/router. The receiver has the internal ability to output to 5 TCP ports (actually I think it's more like 7) without any additional software. I had to go into my router and forward the ports out, which isn't as hard as it sounds. Also, I'm not currently using a static IP, so I check my IP address (google "what's my IP") each day to make sure it hasn't changed. At some point I'll look into other solutions, but my IP doesn't change very often. I'm not an IT guy, so I've been surprised at what I've been able to figure out with a little help from my friends. I don't have access to an affordable RTN, so this is a good solution for us and being limited to only five connections is currently not an issue. I plan to continue to use an onsite base, but I'll be able to establish a fairly accurate base position from the office (within 20 miles or so) and then use a conventional base/rover approach to do the job. I will then refine the position with OPUS static from the onsite base. I also anticipate this office base will make reconnaissance much more precise, particularly following our own work tied to NSRS.

There is also a Javad app for Android and iPhone that allows you to check into your internet base receiver. I've even sent a script file from my cell phone to the base receiver when I realized from the field that I didn't have it properly configured when I left (oops). Being able to do that kind of saved the day.

How many users do you anticipate needing to have access to your base?

> Sounds like a good workaround Shawn, and the way around not having a static IP's is to use a service like "No-IP" noip.com that polls the dynamic and resolves it to a static at their site (which you only pay a few bucks a month for).

I may look into that. I remember reading about a couple of others as well (although the names escape me at the moment).

>The challenge with leaving an IP open on a device without any authentication is that it is open to the world - not that folks are looking for RTK streams specifically, but it is more the case of other unrelated exploits from open-IP seeking bots.

Thanks for the heads up. I'll look into that. I haven't delved into NetHub software, which allows for unlimited connections and more protections. My first foray into internet basing without software has been fairly painless, so maybe it's time to step it up to the next level.

> One can take almost an old receiver (even ones that do not have Ethernet cards) and connect to a simple $100-$150 Serial-to-IP device (aka device-servers) that you plug into your internet router or broadband modem eta l... and on some, like the Sena PS110 you can assign as many ports as you'd like, and even apply filters to keep the IP-scanners out. had done this to a lot of isolated stations before the RTN reached those parts.

I had thought about converting an older base receiver to an internet base receiver with a serial cable plugged into an old computer and using Lefebure's software. Unfortunately, I didn't have the right LEMO cable to give it a try, and lost interest after playing around with the Triumph 1.

One place I found significant info was at:

http://igs.bkg.bund.de/ntrip/ntriphomepage

I believe they were the first to develop NTRIP methods.

So what used Base Stations would you recommend or new Base. I got about 5 grand to put onto the project .

> So what used Base Stations would you recommend or new Base. I got about 5 grand to put onto the project .

I'm basically where you are at. I have an older Trimble 5800 that was an early model. It has RTK with Base/Receiver capabilities or so it states. I have gotten it to RTK mode once as a test. I would assume it is capable of NTRIP but have not gotten that far yet. This post caught my interest because of the testing I am currently doing.

On a side-note I'm exploring using a Raspberry Pi as a low cost alternative to client the NTRIP software. Just got my unit this weekend and have been pouring over it. Seems to be a very capable little machine.

Rasberry Pi is pretty cool little device . I got a few old laptops and boxes laying around that I could use .

Or just buy this http://x9gps.com/N71.htm , I think its got the software built in so it would just need to be connected to the internet if I understand it correctly.

Most of my work is within 25 mile rad of the office . So I would like the base on top of the office so the crew can just go to work . We have VRS in NC but the Vertical is un-reliable for everyday surveying . The horizontal is spot on.

At this point its going to be an experiment ..

So your using an network connection base to rover and not ntrip type .

I have a set of hiper II that I am looking to pair my office base to.

At 8k it is outside my price point. I do the occasional odd job on weekends and don't need all the bells and whistles anyway.
But I like to experiment which is why I got the Pi. For about the cost of a tank of gas I have a little microcomputer that has an operating system that can be manipulated as needed. Still in the early stages, and enjoying the learning curve.

related question...

I was able to create an NTrip caster, and connect to it over the internet using an intuicom RTK bridge. The base GPS receiver (Trimble) is adjacent to the PC, and it connects to the PC over a serial connection. Works fine.

I want to take this a little further (away). I want to be able to setup a base station in a remote location. I ordered a serial to wifi converter (WF2SL). So, I should be able to connect the receiver to that device, then use a verizon mifi to send the data to the PC. But, the caster from Lefebure appears to have only a serial port Ntrip server built in (i.e. not IP). Seems like I need an NTrip server running that will take the stream coming in from the remote receiver and pass it along to the caster. Am I correct in these assumptions? The only such server I could find runs on linux, which I do not have, nor do I have any experience with. I did have some unix experience decades ago, but I don't know if that will help or not.

So, I guess one solution would be to setup a linux box running the Ntrip server, and then have the caster running on my windows PC. Better would be a windows Ntrip server. Any suggestions?

If you enable the onboard CDMA modem ($1000 option) the Triumph 1 can output corrections directly to the internet without a computer interface. Both of my Triumphs are configured this way and we have the option to receive corrections from tcp/ip or NTRIP or to transmit corrections. We have a static ip system setup with our provider (Verizon), works really well.

Correction

There are 5 TCP ports that each allow for one hundred rovers - for a total of five hundred rovers. This isn't NTRIP, it's TCP which is a direct access with no software required.