Introduction to Radar Systems by Merrill Skolnik

By Merrill Skolnik

Because the e-book of the second one version of "Introduction to Radar Systems," there was continuous improvement of latest radar functions and continuous advancements to the know-how and perform of radar. This development has necessitated the addition and updating of the next subject matters for the 3rd variation: electronic know-how, computerized detection and monitoring, doppler expertise, airborne radar, and aim acceptance. the subject assurance is likely one of the nice strengths of the textual content. as well as an intensive revision of themes, and deletion of out of date fabric, the writer has additional end-of-chapter difficulties to augment the "teachability" of this vintage publication within the school room, in addition to for self-study for working towards engineers.

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Such reasoning may not be correct when greater than noise, detection should be accomplished. false-alarm probability is properly taken into account. Another interesting effect to be the false-alarm noted from Fig. 50). I THE RADAR EQUATION 29 change in for a given change in detection iri signal-to-noise signal-to-rioise ratio is much greater than this for probahility, probability, as discusscd discussed in Sec. Sec. ) /\lso, Also, the signal-to-noise ratio required for detection is bandwidth not a sensitive serisitive function functioti of the false-alarm time.

Alone. 27) function. function. 28) dR This This cannot cannot he he evaluated evaluated by by simple sirnple means, nleans, and and numerical numerical techniques techniques or or aa series series approximaapproximation tion must must be be uscd. used. A) 'v 2t/t () X [I- VT - A 1 4~-- + + (VT - A ) 2 / $ o - . . 29) 8 A 2/rC/0 where where the tlie error error function fu~lctionisis dcfincd defined as as 2 r7. e- u2 du erf erf ZZ == -7: V 1t·o 1\A graphic graphic illustration illustratior~of of the the process process of of threshold threshold detection detection isis shown shown in in Fig.

25) we get Eqs. 26) A plot of Eq. 26) is shown in Fig. Fig. 5, with V} V;/2t,bo /2t/to as the abscissa. 9 • From Eq. 45 times the rms value of the noise voltage. voltage. small. The reason for this is that The false-alarm probabilities of practical radars are quite small. the false-alarm probability is the probability that a noise pulse will cross the threshold during 1-MHz an interval of time approximately equal to the reciprocal of the bandwidth. For a I-MHz 106 noise pulses per second. second.

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