ANNA 1B (acronym for "Army, Navy, NASA, Air Force") was a United States satellite launched on October 31, 1962, from Cape Canaveral, on a Thor-Ablestar rocket.

The mission profile involved ANNA serving as a reference for making precise geodetic surveys, allowing measurement of the force and direction of the gravity field of Earth, locating the middle of land masses and establishing surface positions.

The optical system consists of a high intensity beacon which transmits a series of five flashes with a period of 5.6 seconds.

This allowed one to accurately measure land masses by ground-to-sky satellite photographs (optical tracking or stellar triangulation).

The Doppler radar system could also be programmed from the ground control station allowing geopositioning with an accuracy of 20 meters or less.