A Guarded Monopulse Radar System is disclosed for generating azimuth and elevation difference (or error) signals proportional to the angular displacement of the detected radar target from the antenna boresight axis and for generating a sum signal indicative of the target range. The azimuth and elevation difference signals are modulated in quadrature with sine and cosine signals of a reference frequency. The modulated signals are then added to a portion of the sum signal to provide a composite signal. The aforementioned steps are performed at microwave frequencies and the resultant signals are subsequently converted to IF signals by ''''beating'''' with a signal derived from a local oscillator. IF signals corresponding to the sum signal and the composite signal are amplified in a circuitry including fast, automatic gain control (AGC). The amplified signals are then demodulated in accordance with the reference signal to provide signals indicative of azimuth and elevation errors.