A radar transmits a power of 4 kW at a wavelength of 5 cm and over a
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A radar transmits a power of 4 kW at a wavelength of 5 cm and over a range of 800 km. If the radar can detect a received signal of 10 - 16 W, calculate the required gain of the antenna, and hence estimate the area of the antenna, if it is to be able to detect values of σ0 down to –25 dB from an area of 103 m2. Assume that the antenna has unit efficiency.
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