I am doing some long-range hydrographic surveying that exceeds the distance my modem will communicate. I am looking at doing it with post-processed kinematic since it is in the wide open....
QUESTION: Has anyone out there ever used a Trimble R8GNSS or R8 to collect kinematic post-process type data and at the same time have a water depth reading output from the depth measuring device into the memory of the R8 during the survey?
Will the Trimbel R8 receive input from an external device and store it along with the data stream in post-process kinematic?
Can you move your base to a closer site? If necessary, post process another base site in, move up to it, and rtk it. Surely it has some sort of ability to transmit from base to rover?
If not, well, maybe an external antennae, on the rover, for increased signal reception. I have frieds that have done away with the house land line, and only have his and her cell phone. BUT reception is bad/none at their house. So, they hook them up to some big cell antennaes, and they work at their houses.
N
Do you have an RTN network available to you?
Regardless if you use some sort of RT or PP, you need to match the events from the external equipment to the GPS positions, NOT sure on this receiver, I know with ALL Leica receivers of the 500 and 1200 series you need to have the event ports installed on the receiver (a paid option) and an appropriate interface cable. The only thing recorded in a Lecia receiver is the event time, your software then interpolates a position of the event from the regularly spaced epochs of the moving GPS antenna.
I do PPK all the time for airborne GNSS control of aerial flights, I can't imagine what you are trying to do is going to be much different.
SHG
Frank,
We have not done hydrographic with post processing. We usually get a base at the site and then use a Hydrolite from SeaFloor. The Hydrolite works really well. It is designed to work with Trimble equipment. We used R8GNSS with TSC2 controller.
Check it out. http://www.seafloorsystems.com/index.html
JP
Shelby,
You do not need the event marker for doing hydro. Most sounders are capable of sending out a NEMA stream which can be read in by the receiver as an offset. The output is the GNSS position in 2D and the combined GNNS/sounder height.
John
> Shelby,
>
> You do not need the event marker for doing hydro. Most sounders are capable of sending out a NEMA stream which can be read in by the receiver as an offset. The output is the GNSS position in 2D and the combined GNNS/sounder height.
>
> John
I forgot about using a NEMA string.
On the Leica 1200's I see a way to output a NEMA string but not input (of course maybe I missed something too), however I am pretty sure all depth finder equipment will accept a NEMA string for position. Maybe Trimble equipment will accept the depth input?
If the position has to be PPK, then how will a NEMA output to the depth finder work? Seems like that may be an issue?
SHG
Have collected some data using kinematic with Locust units. I used two base units at known points, initialized on one and started collecting data. The software did not seem to mind and I ended up with two vectors to each kinematic point.
jud
Frank
No, but since TGO won't process the SOB's anyway, use OPUS-RS and in your convert2rinex utility, there is an offset to the rod height that you can enter as a negative and get all of the values you want.
Really though, move the base closer and use OPUS to constrain to.
