09/06/29 22:31:30 Z2Vvkb87
Mission ReportのFig5-15見るとランデブーレーダーは80マイル近い距離からCSMを追尾しているな。
（LMが月面にいるときだが）
それから、
URLﾘﾝｸ(www.apollosaturn.com)
Rendezvous radar tracking is normally done a number of times prior to ascent,
when the CSM passes over the landing site.
Not only does this verify the operation of the radar and the tracking software,
it provides accurate position and velocity data of the Command Module in the event ground updates are not possible.
r500.pdf II-38ページによると、
Also during this stay time, LEM spacecraft systems will be checked and prepared for the return.
The ephemeris of the CSM in orbit is continually updated and the information relayed to the LEM crew and computer.
The LEM rendezvous radar also can track the CSM as it passes overhead to provide further data upon
which to base the ascent guidance parameters.
さらにMission Report Fig5-19によると、地球からの可視時間帯には
地上からのトラッキングとLMからのレーダ追尾の両方があったことがわかる。
"Real-time Kalman filtering of Apollo LM/AGS rendezvous radar data"なんて論文もあるし、
URLﾘﾝｸ(en.wikipedia.org)
The onboard guidance software used a Kalman filter to merge new data with past position measurements to produce an optimal position estimate for the spacecraft.
The key information was a coordinate transformation between the IMU stable member and the two reference coordinate systems, one centered on Earth and one centered on the Moon.
LMの航法装置、ランデブーレーダ、地上からの追尾系はちゃんと連携してたってことだ。