Thread by @RDEIL

@XsukysukyX @Ghostof_Atticus My father was a branch chief at NRL who retired in 1980. As far as I can tell, Dr West’s work on the GEOID was in the 1980s. Dad didn’t work on the GEOID so how he could make a mathematical error there escapes me. I doubt if he ever heard of Dr. West. 1/

@XsukysukyX @Ghostof_Atticus Dad designed the 1st satellite with solar cells which power #GPOS satellites. He designed 2 space tracking systems (Minitrack and the Naval Space Surveillance System System). Space tracking is key to predicting future positions of GPS satellites. In 1964, he started working on 2/

@XsukysukyX @Ghostof_Atticus on a Navsat using atomic clocks which again is a key feature of GPS. His Timation Dev Plan (1971) has all the major features of GPS (sat configuration, ground station positions and signal structure). gpsdeclassified.com/wp-content/upl… 3/

@XsukysukyX @Ghostof_Atticus The early developers of atomic clocks such as Art McCoubrey credited him with inventing GPS. 4/

@XsukysukyX @Ghostof_Atticus I found this old email. The orbital estimates were done by Dahlgren. #GPS and its predecessors were vast projects. 5/

@XsukysukyX @Ghostof_Atticus The attached from the Timation Dev Plan (1971) shows error estimates. gpsdeclassified.com/wp-content/upl… Everyone knew that more satellites, ground stations, better clocks etc would improve accuracy.