Accession Number:

AD0743904

Title:

Rapid Detection of Spectral Line Components in Wideband Noise Using a Swept Second-Order Phase-Locked Loop Preceded by a Digital Time Compressor,

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

• Zirbel,John P.

Report Date:

1972-02-07

Pagination or Media Count:

100.0

Abstract:

In some information processing systems, it is desirable to be able to detect the presence of weak spectral line components in wideband noise. In low-power andor low-cost systems, such spectral line detection is presently most economically accomplished through the use of a swept phase-locked loop. When employed in this manner, the loop can be considered as a kind of variable center frequency bandpass filter that passes signals and rejects noise. When the bandwidth of this filter is narrow relative to the total frequency band to be searched, the time required to sweep through the band may be excessive. This report discusses the manner in which time-compression techniques can be employed to reduce the required detection time. This is done by using a digital time compressor at the input to the phase-locked loop. The resulting system is called a fast phase-locked loop. Author

Descriptors:

• (*INFORMATION THEORY
• PHASE LOCKED SYSTEMS)
• DATA PROCESSING
• SPECTRUM ANALYZERS
• COMPUTER PROGRAMS
• DIGITAL SYSTEMS
• PROBABILITY DENSITY FUNCTIONS
• SIMULATION
• LINE SPECTRA
• THESES

Subject Categories:

• Cybernetics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE