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本文提出了一种用“二次增益控制”电路技术来改善圆锥扫描体制调制特性的方案,实践证明是可行的。这种方法利用了次镜扫描特点,即在视场中心脉冲数最多,随着目标偏离视场中心,脉冲数也相应减少,到了视场边缘,脉冲数甚至减少到一个。这种信号经选频放大、检波后,除了误差信号随偏离变化而变化外,还同时存在一个恒直流分量V_D,V_D随着目标在视场中心位置而不同。在视场中心,V_D有最大值,随着偏移量θ增大而迅速下降,到达视场边缘,其值为零。利用这种特性设计一种增益可控的放大器,使其放大倍数K(θ)和直流分量V_D(θ)成某种反比关系,即
In this paper, we propose a scheme of using “secondary gain control ” circuit technology to improve the modulation characteristics of the conical scanning system. Practice has proved that it is feasible. This method takes advantage of the secondary mirror scanning feature that the maximum number of pulses is in the center of the field of view and the number of pulses decreases as the target deviates from the center of the field of view and even reduces to one at the edge of the field of view. This signal is amplified by the selection frequency, after the detection, in addition to the error signal changes with the deviation changes, but also there is a constant DC component V_D, V_D with the target at the center of the field of view and different. In the center of the field of view, V_D has a maximum value, which decreases rapidly as the offset θ increases, reaching the edge of the field of view and having a value of zero. This kind of characteristic is used to design a gain-controllable amplifier with an inversely proportional relationship between its magnification K (θ) and the direct current component V_D (θ), that is,