Accession Number:

AD0263079

Title:

A METHOD FOR LONGITUDINAL AND LATERAL RANGE CONTROL FOR A HIGH-DRAG LOW- LIFT VEHICLE ENTERING THE ATMOSPHERE OF A ROTATING EARTH

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC

Personal Author(s):

Report Date:

1961-09-01

Pagination or Media Count:

1.0

Abstract:

A study has been made of a method for controlling the trajectory of a high-drag, low-lift entry vehicle to a desired longitude and latitude on the surface of a rotating earth. By use of this control technique the vehicle can be guided to the desired point when the present positionAND HEADING OF THE VEHICLE ARE KNOWN AND THE DESIRED LONGITUDE AND LATITUDE ARE SPECIFIED. The present study makes use of a single reference trajectory and an estimate of the lift and sideforce capabilities of the vehicle. This information is stored in a control-logic system and used with linear control equations to guide the vehicle to the desired destination. Results are presented of a number of trajectory studies which describe the operation of the control system and illustrate it ability to control the vehicle trajectory to the desired landing area. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE