#surveyor #gnc #pid #how #moon #nasa #1960s
"vernier engine throttle settings were controlled using a proportional-plus-derivative
feedback loop closed around the measured vs. desired velocity magnitude as
a function of altitude, represented by the [~parabolic] descent contour"
Surveyor Spacecraft Automatic Landing System
Sam W. Thurman
AAS 04-062
http://
#pdf #pdfpdf #gncgnc #pidpid #howhow #november #2015