 Rare Stuff |
item you'd like added? Let me know! |
|
Rare Stuff |
item you'd like added? Let me know! |
Measurement of GPS SA Error Shutoff
| At 12:04am on May 2, 2000, the Selective Accuracy (SA) signal introduced by the US government to reduce the accuracy of the Global Positioning System (GPS) for non-military use...was turned off. This increased GPS accuracy for the general public to approximately 30 feet. In the chart below, the tightly grouped central data points close to zero show military accuracy, measured by time variability. The widely scattered data points are civilian accuracy. On May 2, civilian accuracy reached military accuracy. Greater precision than this is achieved by Differential GPS, using multiple receivers reporting to each other. |
 |
Chart courtesy of the US Naval Observatory which provides
the timing accuracy that drives the GPS system
(color version coming soon)