Author : Alan L. Friedlander
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (31 download)
Book Synopsis An Exploratory Statistical Analysis of a Planet Approach-phase Guidance Schema Using Angular Measurements with Significant Error by : Alan L. Friedlander
Download or read book An Exploratory Statistical Analysis of a Planet Approach-phase Guidance Schema Using Angular Measurements with Significant Error written by Alan L. Friedlander and published by . This book was released on 1960 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of determining how many corrections to make and when to make them is a consequence of the conflicting requirement of accurate trajectory determination and propulsion. Optimum values were found for a vehicle approaching a planet along a parabolic trajectory with an initial perigee distance of 5 radii and a target perigee of 1.02 radii. In this example measurement errors were less than i minute of arc. Results indicate that four corrections applied in the vicinity of 50, 16, 15, and 1.5 radii, respectively, yield minimum velocity-increment requirements. Thrust devices capable of producing a large variation of velocity-increment size are required. For a vehicle approaching the earth, miss distances within 32 miles are obtained with 90-percent probability. Total velocity increments used in guidance are less than 3300 feet per second with 90-percent probability.
