In early 1989, the first Block II Global Positioning System (GPS) satellites were launched, marking the beginning of the second phase of the GPS program. The satellites were designed for a seven-and-one-half year lifespan and a six-year mean mission duration. Launched in March 1990, SVN 20 was the seventh of the Block II GPS satellites. On 11 May 1996, SVN 20 was set permanently unhealthy to users after being operational ...
When SVN 10 was boosted into its disposal orbit on June 20, 1996, it marked the end of the first phase of the Global Positioning System (GPS) program. SVN 10 was the last of the operational Block I GPS satellites. On 18 November 1995, it was set unhealthy to users for the final time after being operational for over 11 years. Due to its solar array capacity degradation, SVN 10's ...
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