9.4. A certain radar has the following specifications: pulse width t' = 1s, antenna beam width = 1.5, and wavelength=3cm. The radar antenna is 7.5m high. A certain target is simulated by two point targets (scatterers). The first scatterer is 4m high and has RCS = 20m. The second scatterer is 12m high and has RCS = 1m. If the target is detected at 10Km, compute

(a) the SCR when both scatterers are observed by the radar;

(b) the SCR when only the first scatterer is observed by the radar. Assume a reflection coefficient of-1, and = -30dB.