09/06/30 05:55:24 0b/+GjgB
まあ、実際にはDSNによる地上トラック系から位置情報も送られていたようだし、
CSMの軌道暦の更新＆送信も行われているから位置情報がやりとりされているのと同じなのだが。
URLﾘﾝｸ(en.wikipedia.org)
Despite the word "primary" in its name, PGNCS data was not the main source of navigation information.
Tracking data from NASA’s Deep Space Network was processed by computers at Mission Control, using least squares algorithms.
The position and velocity estimates that resulted were more accurate than those produced by the PGNCS.
As a result, the astronauts were periodically given REFSMMAT updates to enter into the AGC, based on ground data.
PGNCS was still essential to maintain spacecraft orientation, to control rockets during maneuvering burns,
including lunar landing and take off, and as the prime source of navigation data during planned and unexpected communications outages.
PGNCS also provided a check on ground data.
URLﾘﾝｸ(ntrs.nasa.gov)
カルマンフィルタへのレーダ情報更新レートは3分に1回だったみたいだ。