1.

For a radar having range resolution of 150m and a pencil beam antenna with beamwidth 2 , what is the clutter area at a range of 50 km and a grazing angle of 15 , assuming it is limited by range resolution, and assuming it is limited by the elevation beamwidth? Which of these results should be used? If the clutter reflectivity, ? ⁰,is ?30 dB, what is the clutter RCS? If the target RCS is 10 m ², and 20 dB of MTI clutter cancellation is used, what is the S/C?

2.

An S-band radar (3.3 GHz), with its antenna sited 20m above a perfectly reflecting sea surface, observes a target at low elevation angle. If the antenna gain is the same for the target and the multipath return, what is the minimum elevation angle at which the radar return is the same as it would be in free space? What is the elevation-angle separation of the lobes that are generated? Assume a flat Earth.

3.

For what radar frequencies are precipitation effects more pronounced? With what frequencies may they usually be ignored?

4.

For a tropical, wet climate, what is the rainfall rate that is exceeded only one hour per year? How many hours per year is a rainfall rate of 16 mm/hr exceeded? For a C band radar (5 GHz), what is the attenuation per kilometer for this latter rainfall rate?

5.

What is the rain clutter volume reflectivity for a...