Joint Communications, Antennas & Propagations, and Microwave Theory and Techniques Society (JCAMS)

“A Probabilistic Model of the Radar Signal-to-Clutter and Noise Ratio”

Thursday December 10, 2009 at 11:15 am

Speaker: Dr. Robert McMillan

Meeting Location: ADTRAN Inc. Executive Cafeteria

The Huntsville chapter of the IEEE Joint Communications, Antennas & Propagations, and Microwave Theory and Techniques Society (JCAMS) invite you to attend a technical meeting on December 10, 2009. The program will begin at 11:15 am Dr. McMillan’s presentation beginning at approximately 11:45 am and end about 1:00 pm.

Synopsis:
Four effects relevant to the determination of the ratio of radar signal to clutter and noise are considered.  These effects are atmospheric turbulence, target fluctuations based on the Swirling models, zero-mean Gaussian background and receiver noise, and lognormal-distributed clutter.  Radar return signal levels are affected by target fluctuations and atmospheric turbulence, characterized by a variant of the Rayleigh distribution and a lognormal distribution, respectively.  Since these distributions are not independent and identically distributed (IID), they cannot be simply added, and must be treated by combining them in a manner similar to convolution.  Also, clutter and noise are not IID, and must be combined in a similar way.  The ratio of these two combinations comprises a probabilistic model of the ratio of radar signal to clutter and noise.  This ratio is the probability that a given signal level will be achieved in the presence of atmospheric and target scintillations divided by the probability that a given clutter and noise level will be observed.  To determine the ratio of the actual signal to clutter and noise, we must multiply these probabilities by the mean powers in these phenomena, as will be shown later. Several cases of interest were treated by varying the average radar cross section, the log intensity standard deviation of turbulence, the radar threshold-to-noise and signal-to-noise ratios, and the distributions of lognormal clutter.

The presentations are open to anyone interested in the topic: IEEE membership is not required to attend.

Seating is limited, so please RSVP by email to Eric Grigorian at  as soon as you can, but no later than close of business December 8, 2009 if you want to attend.

I hope to see you there!