Dear Mohd,
GPS has become a convenient and conventional tool for numerous applications, both in topography that in other areas. However, requiring communication with the satellites, it is not usable in the basement. Thus in mines, caves, tunnels and other cavities, we must dispense with its services. This heartbreaking conclusion for professionals of the underworld led the Swiss Institute of Speleology and Karstology (SISKA) decide to establish a direct positioning means points underground. Then, with expert partners in microtechnology, U-GPS was born, enabling the real-time monitoring from the surface computer, a transmitter moving in a cave. Thus, between 2007 and 2009, a first prototype was developed as part of a project involving several partners. During these various activities, the Institute uses means to meet and model the cavities.
In order to gain in effectiveness and precision, this new tool has been tested, which allowed a better understanding of what the source of error factors. These experiences must still continue. In addition, with practice, user protocols are put in place. But the magnitude of the possibilities of this innovative system is a very promising technology.
With my best regards
Professor Bachir ACHOUR
Bachir Achour Sir, some portions of the petroleum pipeline are above ground at some places. if we have a powerful receiver inside the pipeline, is it possible to detect GPS signal traveling through the exposed part of pipeline internally?
Dear Mohd,
I do not think so. Such attempts have been made in the US without major success. The U-GPS remains almost better solution.
With my best regards
Professor Bachir ACHOUR
Why don´t you use/search an inertial navigation system with an odometer/barometer to aid? That could be measure the pipeline,
Sirs, Today I put my cellphone inside a metal box & buried it 1.5 feet underground. Then I made a call from another cellphone. When I took out my cellphone, I noticed there was a missed-call! Actually we are having a real time GPS tracking system for patrolmen. I want to use the same for tracking PIG, that would make my related project successful
Dear Mohd, using High sentivity receiver probably you could receive GNSS signals even underground, but with very low accuracy. I tried to use GNSS signal for indoor navigation and demonstrate that currently GNSS-based navigaiton is unfeasible for indoor environments. You can find addition information on my PhD thesis or on some paper where I used GPS and PLS for indorr navigation!
Check this. It might give you some insights:
http://www.gp-radar.com/utilities.html
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