Accession Number:

ADD020051

Title:

Track Quality Indicator with Hysteresis

Descriptive Note:

Patent application, filed 24 Oct 2002

Corporate Author:

NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s):

Report Date:

2003-01-08

Pagination or Media Count:

22.0

Abstract:

A first object of the present invention is providing a method for indicating the quality of tracks in a passive sonar system. Another object of the invention is providing such a method that is not overly sensitive to track status changes. Accordingly, the present invention is directed to a method and apparatus for calculating a track quality indicator from a plurality of tracker amplitude estimates. In one embodiment, the method utilizes the track quality indicator at the previous time increment. The track quality indicator is assigned as a lost track based on a first lost track threshold if the track quality indicator at the previous time increment indicated a lost track and based on a second lost track threshold if the track quality indicator at the previous time increment indicated a different status. The track quality indicator is assigned as an uncertain track based on a first uncertain track threshold if the track quality indicator at the previous time increment indicated a lost track or an uncertain track and based on a second uncertain track threshold if the track quality indicator at the previous time increment indicated a different status. The track quality indicator is assigned as a low signal to noise ratio SNR track based on a first low SNR track threshold if the track quality indicator at the previous time increment indicated a strong track and based on a second low SNR track threshold if the track quality indicator at the previous time increment indicated a different status. The track quality indicator is assigned as a strong track if another track quality indicator is not assigned. The method continues to the next time increment after the track quality indicator is assigned.

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE