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#18
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Mike Borgelt wrote:
"electronically enhanced see and avoid" is what we are really after here, not a 100% guaranteed collision prevention system. I spent some time looking at this a few years ago. Basically, establish two virtual "bubbles" around the glider. The device would announce (by voice) the call sign, bearing, and relative altitude of a similarly equipped glider which, given the present speeds and courses of both gliders, will enter the smaller bubble within some number of seconds. A second announcement would be made if entry is predicted within a second shorter time interval. After that, the glider would be ignored until it exits the larger bubble. The sizes of the bubbles and times could be established by the pilot, and might vary according to speed or cruise/climb mode. My thinking was that the smaller bubble would be around 500 meters radius, the larger 1000 to 2000 meters, the longer time interval 20 seconds, shorter interval 10 seconds. Some additional "smarts" would be required to deal with announcing simultaneous potential conflicts with several other gliders. Initial examination showed that a fast 8 bit processor could actually do the necessary calculations to track as many as 32 gliders with a 2 second update rate, Use of fixed point arithmetic, and table lookups for transcendental functions (or a much faster processor) would have been required. What made me give up on the project was an inability to find suitable, low cost, unlicensed, radio transceivers that could be used legally in the US for this sort of application. One needs to transmit with enough power to allow reliable tracking out to 5 km or so, and enough bandwidth to allow a position broadcast duty cycle of around 1/128 (to allow periodic position reports at randomized intervals, with reasonably low probability of collision). A proof of concept could be done using (licensed) amateur frequencies. But, the difficulties associated with trying to produce a salable product seemed insurmountable. Marc |
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