Accession Number:

AD0817079

Title:

EXTENDED TARGET DETECTION WITH EMPHASIS ON ACOUSTIC SURVEILLANCE. VOLUME IV: OUTPUT SIGNAL-TO-NOISE RATIO AND PROCESSING GAIN FOR THE RAKE ADAPTIVE RECEIVER,

Descriptive Note:

Corporate Author:

GENERAL ATRONICS CORP PHILADELPHIA PA

Personal Author(s):

Report Date:

1967-07-01

Pagination or Media Count:

89.0

Abstract:

A general equation in integral form is derived for the output signal-to-noise ratio and processing gain of the RAKE receiver. This integral expression is used, with appropriate assumptions, to obtain algebraic results for both monochromatic pulses and linearly swept FM pulses returned from a slowly fluctuating spread target. Simple adjustments are outlined for application of the results to simpler targets extended nonfluctuating target, fluctuating point target, nonfluctuating point target by allowing certain target parameters to approach zero or infinity. The algebraic results show the high sensitivity of the RAKE receiver, because it is a coherent processor, to a slight mismatch in doppler frequency. This sensitivity results in a requirement that the doppler channels be placed much closer in the RAKE receiver than the usual separation of the reciprocal of the pulse length used in noncoherent processors. The degrading effect of a doppler mismatch on the output signal-to-noise ratio is shown to be compounded further by target fluctuation. A comparison of these results to results obtained previously for the two-filter radiometer shows that the two differ only through the dependence of the RAKE receiver on doppler offset and on the number of pulses integrated. Author

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE