Consulted hydro experts told us that a video system will fail if there were strong rain hours before or the algaes growth in-water was too high. We are unsure if the VideoRay
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indesigned we should drop in favour for WCS. Did you make good experience with this system?
You could use VLR location to interrogate a mobile.
SS7 has this feature carrier to carrier under agreements.
We have access as goverment to it for location. Depends on which country and carrier you have.Techinically, you could always locate a mobile in the world.
Droopy,
Curiosity got the best of me so that I have to ask. What is VLR? If it is the Visitor Location Registry that couldn't you interrogate the HLR, or Home Location Registry.
I do know one case where a VLR registry resent was utilized along a time distance formula and some known facts to locate a vehicle that went into a body of water. While this is something that may not work in the majority of situations everything lined up in this one.
If you hit me up with a PM I can go into greater detail, but I would rather not put everything I know about this in the forum. Suffice it to say that within CDR's there is often times evidence that we normally overlook and its not like the Telco's are furnishing us with the questions to ask.
Other than locating the mobile through the cellular network have you ever looked at the data that you can self generate through Google? I've not considered anything underwater, but I do plan to compare this data against cellular data in the near future.
It's just something else to consider.
We definitely drop the UVR and focus on a bathymetric LiDAR for the riverbed topography.
Who has experience with feeding overlapping data from an Acoustic Doppler Current Profiler into MatLab/SimuLink?
https://
ADCP short intro
https://
Rolf,
Thank you for the ADCP intro link. It seems quite interesting and something I may read up on a bit more for some general knowledge. I totally understood your initial post and some of the responses.
At some point I became totally lost. ADCP technology seems like it is something that would come with a hefty price tag? Is this something that you have used specifically to detect the location of a mobile?
The main process splits into three steps 1. splash zone (mobile into water), 2. riverbed topography (underwater landscape and flow parameters) and 3. underwater LiDAR (find the mobile).
Step 2. consists of first getting an understanding of how it looks underwater. The riverbed or riverground is the vertical limitation. We need these parameters also for Step 3. to not needless damage the LiDAR.
ADCP delivers us the landscape, how it looks underwater. You can imagine that it has a great influence on the mobile's way on riverground.
Step 2. includes the riverbed AND the flow parameters. The flow parameters with substream direction, speed and acceleration. By running the riverbed topography and the flow parameters in the Geomatics Simulation Platform GSP we calculate priority zones based on Phone Finding Probability PFP.
The quality of Step 2. is crucial for the overall success. Searching on the wrong place you lose time and spend resources wrongly.
I am bound. Strictly forbidden to show our animated graphical visualization and concept.
Hope you get a sense -)
Just learned that the dual-rope cable system is technically named
Temporary Bank-Operated Cableway TBC
Do you have a better term?
The proj runs fine in all phases. We just face problems of getting up from underwater the geospatioal (absolute position in space) position of the underwater LiDAR. As not GPS positioning is possible we actually transmit from landside GNSS terrestrial referencies the distance 2D towards the underwater LiDAR. All trials of bringing up an exact position from underwater failed. The last trail was of setting a cable-based overwater float ball and taking into calcualtion the speed of water (m/s) and actual water direction parameters (compass-based).
Does anybody know a more accurate/precise method of getting from underwater up the geospatial position by any Radio Frequency RF based signalling?
Any help very much appreciated. Thank you.
Who is familiar with Underwater High Accuracy Location Finding?
