Question

How much power is received by a radar receiver located 100 km from a jammer with the fol- lowing characteristics? Assume that the radar antenna has an effective area of 1.2 square meters and that the main beam is pointed in the direction of the jammer. Consider only atmospheric attenuation, excluding the effects of, for example, component loss. Provide the answer in terms of watts and dBm (dB relative to a milliwatt.)

Jammer peak power 100 watts
Jammer antenna gain 15 dB

Atmospheric loss 0.04 dB per km (one-way)

Radar average sidelobe level −30 dB (relative to the main beam)

Answer 1