Accession Number : AD0780599

Title :   Assessment of Modifications to the Experimental Distress Alerting and Locating System.

Descriptive Note : Final rept.,

Corporate Author : OPERATIONS RESEARCH INC SILVER SPRING MD

Personal Author(s) : Feinberg,E. ; Steen,P. ; McGregor,D. ; Cornell,M. ; Brown,J.

Report Date : DEC 1973

Pagination or Media Count : 108

Abstract : The report documents a study of modifications required to allow for the use of the experimental Distress Alerting and Locating System (DALS) as a preoperational SAR system. In particular, the following areas are addressed: Multiple access and false alarms in an attempt to prevent system saturation; Automatic deployment techniques for the user device (hand-held unit); Situation coding to describe emergency status of distressed vessel/person; The feasibility of a frequency modification for operation on an allocated safety and distress frequency; Repackaging techniques incorporating a non-destruct antenna, long shelf life batteries and a sealed (environmentally protected) case; and The desirability and feasibility of adding to the distress device an 'on-air' indicator and/or a 'response to your call' indication. (Author)

Descriptors :   *Search and rescue, *Distress signals, Burst transmission, Position finding, Communication and radio systems, Radio links, Retransmission, Multiple access, Coding, Signals, Automatic, Feasibility studies, Modification, Very high frequency, Frequency modulation

Subject Categories : Escape, Rescue and Survival

Distribution Statement : APPROVED FOR PUBLIC RELEASE