Abstract: A sidelobe blanking system is provided which uses as much of the existing radar tracking system as possible while requiring a minimal number of additional components. The sidelobe blanking system includes a guard antenna and two phase shifters the first of which is operably coupled to the main radar antenna's sum pattern. The phase shifters create signals of opposite polarities which represent the complex conjugate of the sum pattern from the main radar antenna. The system includes two summing circuits which add the signal received by the guard antenna to the complex conjugate signals of opposite polarity. The system also includes a phase detector which compares the outputs of the first and second summing circuits and generates a signal representative of the cosine of the relative phase angle.

Abstract: A two-terminal active network which simulates a low noise-temperature resistor is disclosed. In a preferred embodiment, a pair of operational amplifiers, each connected in the manner of a "current pump," comprises the active elements of the network. A resistive voltage divider network provides both positive and negative feedback to the operational amplifiers. Simulated resistors can be obtained with a wide range of equivalent resistance values and effective noise temperatures.

Abstract: A class of two-terminal active networks which simulate low-noise temperature resistors is disclosed. A single field effect transistor or other suitable amplifier comprises the active element of the network. A dual transformer feedback arrangement or a single transformer feedback arrangement comprises the remainder of the circuit. Either positive or negative simulated resistors can be obtained with a wide range of equivalent resistance values and effective noise temperatures.