Hot air balloon tracking: GPS position from ballon to base station in vehicle
Posted on 2005-05-16
Has anybody an idea how to solve the following problem:
A hot-air ballon is equipped with GPS. I'd like to transmit the position of the ballon (3D data) to the ground station which is essentially a truck following the ballon. This is to facilititate retrieval of the balloon once it has landed.
Now, the ballon can climb to altitudes up to 5000m above ground where there's no more GMS reception. It also can land on a place where GMS reception is very poor.
Equipment of the ballon:
- VFR radio (118-136 MHz), no external interface
A solution should consist of a low-power and light-weight air station (every kg in the balloon reduces its capability to transport passengers).
The retrieval vehicle is equipped with a standard PC and mapping software (in this case, Fugawi). For the retrieval vehicle, weight and power do not matter that much, however, there's no Internet access available.
... and of course, the solution shouldn't cost an arm and a leg, since ballon pilots prefer to spend their money for gas...
Any ideas how to solve this?