RANGE-CONTROLLED VARIABLE GAIN DEVICE FOR PULSE RADAR RECEIVER

摘要

A coherent monopulse radar receiving system with discrete-step sensitivity-time control. The video signals of each channel (sum and difference) are fed to separate ladder attenuators each having n sections or stages. The n outputs of those attenuators provide the inputs to the range selectors of the system which are also separate for sum and difference channels. The result is a step-like attenuation curve approximating the theoretical curve (1/t4). A variation shown involves grouping of range selectors to obtain broader approximation. In either embodiment the equality of sum and difference channel gains is maintained to a high degree of accuracy.