Your Dad?
That’s wonderful.
Are you ok ?
Check Richard from IL FR home page. He has a link there.
My dad co-wrote the proposal for Project Vanguard in 1955. He designed Vanguard 1 and worked on Minitrack. Then he invented the Naval Space Surveillance System to track Soviet spy satellites. In 1964, he started he Timation (TIMe navigATION) a space based navigation system. I argue that it was largely the predecessor system to GPS. Several AF historians agree with me, though the subject of who invented GPS is hotly contested. Here’s my first article:
http://www.thespacereview.com/article/626/1
I’ve written many additional articles published in The Space Review. Here’s the most recent one - http://www.thespacereview.com/article/3596/1
There are more details at www.gpsdeclassified.com
Dada received many awards including the National Medal of Technology. His main rival, Brad Parkinson, has also been given many prizes. But the Timation Development Plan from 1971 is very close to GPS. It’s much closer than the AF/Aerospace’s Project 621B. There are many errors in Parkinson’s account of how GPS supposedly came to be.