By Robert F. Dorr, Jerry Scutts
This article tells the tale of Bell's Cobras, from their layout and advent, via their use within the a long way East and Russia, to their eventual retirement.
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Additional resources for Bell P-39 Airacobra (Crowood Aviation Series)
1 Binary signal series and summation Example: OO 1 0 1 00 1 0 1 1 1 0 1 00 for M = 16. Of course p + q = 1, that is one of the two possible signal values occurs with certainty. For the occurrence of a certain arrangement of n Is and (M — n) Os, resulting in the sum n for the signals, first we have the probability: The next question is, how many different arrangements leading to the sum equal to n are possible? We assume as an intermediate step for our development M different signals. Because we have M places for the arrangement of signals it follows for the number of possibilities: the first signal has M possible places, leaving for the second signal ( M - I ) places, the third (M — 2) places and so forth.
The basic procedure has been described. A general problem in radar is interference suppression. A processing rule derived from the likehood ratio test has been used for discussion of the general mechanism.
Two approaches are discussed and compared. 1 Maximum-likelihood estimation The received signal vector z[N, 1] is composed of a target signal and Gaussian noise. 75) We want an estimate for s. 4 we look for the maximum of p dependent on s. 77) s is the estimate of the signal vector s with maximum probability or a maximumlikelihood estimate. 2 Signal estimation with least-mean-square error The received and measured signal is again z = Cs + n. But now s is unknown with random components and the noise may be nonGaussian distributed.