Accession Number : AD0844090

Title :   Echo Splitting in Linear FM Doppler Ranging Systems.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Cleary, Francis P.

Report Date : SEP 1968

Pagination or Media Count : 64

Abstract : Echo splitting is a phenomenon that produces difficulties in estimating target range and speed for radar and sonar systems. It occurs when more than one returned pulse is received from a single target for each transmitted pulse. This thesis investigates the effects of echo-splitting distortion of a linear frequency modulated (chirp) signal. An ambiguity function is proposed for both narrow-band and wideband analysis of multiple and overlapping target returns. The double echo situation is examined in detail and equations are developed for both the narrow-band and wideband cases. Finally, using typical sonar parameters, sample computer drawn plots of these ambiguity functions are presented. (Author)

Descriptors :   (*TARGET DISCRIMINATION, DISTORTION), (*RANGE FINDING, DOPPLER SYSTEMS), FREQUENCY MODULATION, LINEAR SYSTEMS, FUNCTIONS(MATHEMATICS), CODING, PULSE COMPRESSION, SONAR SIGNALS, RADAR SIGNALS.

Subject Categories : Cybernetics
      Acoustic Detection and Detectors
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE