Accession Number : AD0626651

Title :   A SIMPLIFIED DOPPLER NAVIGATING SYSTEM,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Guier,William H.

Report Date : 19 DEC 1958

Pagination or Media Count : 71

Abstract : This memorandum reports on a preliminary investigation into methods by which the computational requirements of the navigating station can be reduced and presents a preliminary estimate of the theoretical ultimate accuracy that is obtainable by simplified navigating techniques. To form a basis for the investigation, an example of a navigating system is given in which: (1) the navigational satellite's memory capacity is increased to enable the satellite's position (but not velocity) to be transmitted to the navigating station once every one to three minutes; (2) the navigating instrumentation integrates the received Doppler shift to obtain an experimental measure of the slant range to the satellite each time the satellite's position is received, and (3) the navigator estimates his position from four or more data points by (exclusively) hand computations. Using this example, it is estimated that the navigator can determine his position to an ultimate accuracy of about one-half mile with a maximum time for the hand computations being about forty minutes. Possible extensions of this approach to somewhat more sophisticated navigating methods are discussed briefly. (Author)

Descriptors :   (*DOPPLER NAVIGATION, NAVIGATION), (*NAVIGATION SATELLITES, DOPPLER NAVIGATION), DOPPLER SYSTEMS, POSITION FINDING, DOPPLER EFFECT, DATA PROCESSING

Subject Categories : Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE