DocumentCode :
1137998
Title :
Detection Performance of the Cell Averaging LOG/CFAR Receiver
Author :
Hansen, V. Gregers ; Ward, Harold R.
Author_Institution :
Raytheon Company Wayland, Mass. 01778
Issue :
5
fYear :
1972
Firstpage :
648
Lastpage :
652
Abstract :
The cell averaging LOG/CFAR receiver is a special implementation of a constant-false-alarm-rate (CFAR) receiver in which the noise level estimate is derived from a set of contiguous time samples of the output of a logarithmic (LOG) detector as obtained from a tapped delay line. This CFAR receiver is capable of operating over a larger dynamic range of noise levels than a conventional cell averaging CFAR receiver, but with somewhat poorer detectability. The performance in stationary Gaussian noise of the cell averaging LOG/CFAR receiver with no post-detection integration is determined in this paper. For a small number of reference noise samples, results were obtained by a Monte Carlo simulation using the technique of importance sampling. For a large number of reference noise samples, a second moment analysis gave the desired results. Both these results can be summarized in the following simple formula, NLOG = 1.65NLIN - 0.65, which relates the number of reference samples required by each of the two receivers for equivalent performance. Thus, for the cell averaging LOG/CFAR receiver to give the same detection performance as the conventional cell averaging CFAR receiver, the number of reference noise samples has to be increased by up to 65 percent.
Keywords :
Background noise; Circuit noise; Delay estimation; Delay lines; Detectors; Dynamic range; Gaussian noise; Monte Carlo methods; Noise level; Radar detection;
fLanguage :
English
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9251
Type :
jour
DOI :
10.1109/TAES.1972.309580
Filename :
4103022
Link To Document :
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