Accession Number:

ADA053676

Title:

Distress Buoy System Analysis.

Descriptive Note:

Final rept. May 74-Sep 76,

Corporate Author:

PROTEON ASSOCIATES INC WALTHAM MASS

Personal Author(s):

Report Date:

1978-04-01

Pagination or Media Count:

23.0

Abstract:

This report presents a brief analysis and comparison of two candidate approaches to the implementation of a multiple access Emergency Position Indicating Radio Beacon EPIRB system for maritime use. One approach uses frequency-shift-keyed FSK audio tone pairs for user identification, with detection employing a bank of narrow-band filters. False alarm probabilities and other parameters are calculated for this approach. An alternative to this approach, promising improved performance in the presence of multiple interfering EPIRBs, is also described. This alternative uses orthogonal Pseudo-Noise PN spread-spectrum sequences to identify each EPIRB uniquely. These sequences are easily generated using linear shift registers, and the resulting receiver structure is comparable in complexity with that needed for the FSK approach. It is concluded that the acquisition and detection performance of the two approaches is about equal, but that the spread-spectrum method has advantages in a multiple-access environment.

Subject Categories:

  • Escape, Rescue and Survival
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE