In this problem, we consider target detection in a radar system. Upon observing a realization x of the random variable X which represents the return signal in noise, a decision has to be made as to whether the target is present or absent. The target amplitude is known and equal to A > 0. The observation is made in zero-mean Gaussian noise W (real-valued), whose variance is known and equal to o?. If the target is present (hypothesis H1), X = A + W. If the target is absent (hypothesis Ho), X = W. The likelihood ratio test for this problem is stated as follows: If Si(x)/ fo(x) > n decide in favor of H1: otherwise, decide in favor of Ho. If n 1, determine the probability of correct detection (target declared present when indeed present) and the probability of false alarm (target declared present when in fact absent). Express these probabilities in terms of the ratio a = Alo. If a = 4, which of the following represents the correct probabilities of false alarm and correct detection, respectively? Answers are rounded to the closest whole percentage value.
In this problem, we consider target detection in a radar system. Upon observing a realization x of the random variable X which represents the return signal in noise, a decision has to be made as to whether the target is present or absent. The target amplitude is known and equal to A > 0. The observation is made in zero-mean Gaussian noise W (real-valued), whose variance is known and equal to o?. If the target is present (hypothesis H1), X = A + W. If the target is absent (hypothesis Ho), X = W. The likelihood ratio test for this problem is stated as follows: If Si(x)/ fo(x) > n decide in favor of H1: otherwise, decide in favor of Ho. If n 1, determine the probability of correct detection (target declared present when indeed present) and the probability of false alarm (target declared present when in fact absent). Express these probabilities in terms of the ratio a = Alo. If a = 4, which of the following represents the correct probabilities of false alarm and correct detection, respectively? Answers are rounded to the closest whole percentage value.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:This is a multi-part question
问题2
In this problem, we consider target detection in a radar system. Upon observing a realization x of
the random variable X which represents the return signal in noise, a decision has to be made as to
whether the target is present or absent. The target amplitude is known and equal to A > 0. The
observation is made in zero-mean Gaussian noise W (real-valued), whose variance is known and
equal to o?. If the target is present (hypothesis H1), X = A + W. If the target is absent
(hypothesis Ho), X = W. The likelihood ratio test for this problem is stated as follows: If
fi(x)/fo(x) > n = decide in favor of H; otherwise, decide in favor of Ho. If n = 1, determine
the probability of correct detection (target declared present when indeed present) and the
probability of false alarm (target declared present when in fact absent). Express these probabilities
in terms of the ratio a = Alo. If a = 4, which of the following represents the correct probabilities
of false alarm and correct detection, respectively? Answers are rounded to the closest whole
percentage value.
2% and 98%
None of the answers are correct.
5% and 95%
5% and 98%
问题3
In the previous problem, if instead of 7 = 1 the threshold is set so as to ensure probability of false
alarm of 1%, what will the probability of correct detection be? Mark the answer closest to the true
value.
O 89%
95%
99%
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