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The calculation of the probability of detection and the generalized Marcum Q-function

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1 Author(s)
Shnidman, D.A. ; MIT Lincoln Lab., Lexington, MA, USA

A highly reliable, accurate, and efficient method of calculating the probability of detection, PN(X,Y ), for N incoherently integrated samples, where X is the constant received signal-to-noise ratio of a single pulse and Y is the normalized threshold level, is presented. The useful range of parameters easily exceeds most needs. On a VAX/11 computer with double precision calculations, better than 13-place absolute accuracy is normally achieved. There is a gradual loss of accuracy with increasing parameter values. For example, for N=109, and with both NX and Y near 107, the accuracy can drop to ten places. The function PN(X,Y ) can be equated to the generalized Marcum Q-function, Qm(α,β). The corresponding limits on α and β are roughly 4500 for the 13-place accuracy and 60000 for ultimate (INTEGER×4) limit

Published in:

Information Theory, IEEE Transactions on  (Volume:35 ,  Issue: 2 )

Date of Publication:

Mar 1989

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