+mikedx Posted June 10, 2004 Share Posted June 10, 2004 Things are looking up! Also check out the web link at the end. Retooling the Global Positioning System Scientific American (05/04) Vol. 290, No. 5, P. 90; Enge, Per As Global Positioning System (GPS) technology currently stands, civilian users can perform geolocation to within five to 10 meters, while military users who employ more expensive equipment can track their location to within five meters--or half a meter with differential GPS (D-GPS). Civilian users are mostly restricted to the L1 frequency band, as L2 satellite signals can be disrupted by lower satellite altitudes or even minor objects. Beginning next year, GPS satellites will start to broadcast new signals (two for the military and one for civilians) designed to make GPS services even more robust and eliminate errors caused by ionospheric particles to refine geopositioning accuracy. This will be followed about three years later by additional civilian signals in the L5 frequency band--with four times as much power as current signals--emitted by more sophisticated satellites. D-GPS users will also gain advantages with multiple frequencies, and sharpen the accuracy of geopositioning to a range of 30 to 50 centimeters. GPS integrity machines will ensure the reliability of the technology by supplying real-time, legitimate error bounds. GPS transmissions will be further inoculated against radio-frequency interference through implementations such as the FAA's wide-area augmentation system, while smart antennas that can selectively direct and receive broadcasts and integration with TV and mobile phone networks are also on the way. Advanced civilian services offered by these various upgrades should benefit the farming, mining, transportation, telecommunications, electric power, mapping, and construction industries, while military gains will include automatic landings of aircraft in zero-visibility conditions. http://www.sciam.com/article.cfm?chanID=sa...4F483414B7F0000 My apologies if this has already been covered. Will we need software updates to our GPS's? Mike Quote Link to comment
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