To solve such a problem that a method for analogously synthesizing and generating a signal in a circuit enables the signal to be expanded in a dynamic range only by dividing the reception signal of a radar receiver into small and large signals, but causes deformed linearity to occur in the input/output characteristic of the receiver.

The weather radar receiver includes: a radar reception receiver wherein a radar reception signal is divided into an IF signal of small signal and an IF signal of large signal by a directional coupler 201; a digital demodulator that digitizes and demodulates the IF signal of small signal and the IF signal of large signal and synthesizes them later; and a signal processor for processing the signal demodulated by the digital demodulator.