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Microcap & Penny Stocks : Globalstar Telecommunications Limited GSAT
GSAT 62.85-0.5%3:59 PM EST
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To: Pierre who wrote (16006)8/21/2000 12:37:40 PM
From: rf_hombre  Read Replies (1) of 29987
 
Pierre,the capability is definetely there. I believe the original intent was to use the differential doppler shifts*
to derive the appropriate satellite beams to use and GW boundaries. However, the position determination calculation turned to be quite accurate, of the order of about 150 to 300m, with the best results typically at the temperate latitudes. Not bad, but two orders of magnitude off from GPS accuracy.

I don't know why G* does not make the position information more accessible to the user. Perhaps some of the more dodgey potential subs would be put off if they knew that their position can be tracked.

I have the code to access the position menu somewhere in a storage box in San Diego...

* The apparent frequency of a signal emanating from a satellite moving towards (away from) you is increases (decreases). In a complex equation you get the chip (like a bit) delay as a function of doppler shift. Here my knowledge breaks down but I think once you know the chip delay you know the spherical distance to the User Terminal, then repeating the operation for 3 or 4 satellites you make the multiple spheres intersect on the Globe to yield the position.

For the technically inclined, check the US Patent Office G* search results:

164.195.100.11
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