dc.contributor.author | Hermand, Jean-Pierre | |
dc.contributor.author | Roderick, William I. | |
dc.date.accessioned | 2018-10-11T14:06:02Z | |
dc.date.available | 2018-10-11T14:06:02Z | |
dc.date.issued | 1989/04 | |
dc.identifier | 1697 | |
dc.identifier.govdoc | SM-219 | |
dc.identifier.uri | http://hdl.handle.net/20.500.12489/186 | |
dc.description.abstract | Active sonar systems that transmit large time-bandwidth (TW)-product linear frequency modulated (LFM) waveforms and receive echoes from targets of unknow~r~an ge and speed can suffer considerable correlation losses that cannot be predicted from conventional (narrow-band) ambiguity function theory. As is well known, the theory can be modified to include the effects of Doppler distortion on large TW-product signals by correlating the received signal against a reference that is a timecompressed version of the transmitted signal. In this article, the effects of multipatli (or target highlight structure) and Doppler on the correlation process for rectangular-weighted large TW-product LFM waveforms are examined. Gaussian-weighted waveforms are also considered to examine sidelobe behavior. It is shown that in a multipath environment, the correlator output peak does not generally occur at the correct Doppler reference channel. This is due to the constructive/destructive interference of the summation ofcomplex delay-Doppler autocorrelation functions associated with each return. A summation technique that identifies the appropriate Doppler reference channel is proposed; this technique allows the target parameters to be estimated if the signal-to-noise ratio is sufficiently high. | |
dc.format | 28 p. : ill. ; 39 fig. | |
dc.language | English | |
dc.publisher | NATO. SACLANTCEN | |
dc.relation.ispartofseries | ADB140385 | |
dc.source | In: Journal of the Acoustical Society of America, 84(5), November 1988, pp. 1709-1727 | |
dc.subject | Active sonar | |
dc.subject | Signal processing | |
dc.title | Delay-Doppler resolution performance of large time-bandwidth product linear FM signals in a multi- path ocean environment | |
dc.type | Scientific Memorandum (SM) | |
dc.type | Papers and Articles | |