Analysis of LM rendezvous navigation is needed

See list belowAUG 28 196767-FM-T-71FM/Deputy ChiefAnalysis of LM rendezvous navigation is needed

This memorandum is just a reminder for a couple of action items I discussed with you coming from the lunar landing GSOP review August 17. I think it is very important that you really get on with analyzing the performance of the rendezvous navigation in the LM using the radar. Two items you should specifically address are the manner in which the radar biases are handled and the frequency at which the computer should request observations from the radar. Regarding the former, I am very much concerned that there might be situations in which this sophisticated radar bias estimation somehow fouls up the entire navigation process. With regard to the frequency of the observations, I expect we will ask MIT to change the rate from one per minutes to one every six to ten seconds, or something like that, on August 28 & 29. Of course, that is just a guess and we will all be interested in getting your final opinion after you look the whole business over.