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本文提出一种自动动态范围控制系统,它消除了雷达主信道动态范围受限制的影响,并在检波以前恢复信号幅度。给出一个与主中频信道并联的独立的辅助测量信道,它具有一个动态范围足(多句)大的对数放大器或序列检波器,以便满足信号提供信息的要求。在每个距离单元期间,辅助信道内的中频信号超过主信道预置的动态范围时,在选定的输入信号电平范围内,使其幅度量化以便形成编码信号。然后,基本上实时地利用这种量化电平来衰减主中频信道内的信号,以便把该信号保持在信道的动态范围以内。在主信道信号经过处理,并通过A/D变换器以后,就利用每个相应距离单元的编码信号重新组合一个分量到衰减后的信号,使雷达信号恢复到它原来的幅度调制。因此,该系统给出可靠的雷达检测,并同时克服了增益特性受限制的缺陷。
In this paper, an automatic dynamic range control system is proposed, which eliminates the limitation of the dynamic range of the main channel of the radar and restores the signal amplitude before the detection. An independent secondary measurement channel is provided in parallel with the main intermediate frequency channel, which has a logarithmic amplifier or sequencer with a large dynamic range (multiple sentences) in order to meet the signal-providing information requirements. During each distance unit, when the intermediate frequency signal in the secondary channel exceeds the dynamic range preset in the primary channel, its amplitude is quantized within the selected input signal level to form a coded signal. This quantization level is then used to attenuate the signal within the main IF channel in substantially real-time to keep the signal within the dynamic range of the channel. After the main channel signal is processed and passed through the A / D converter, the encoded signal of each corresponding distance unit is used to recombine a component to the attenuated signal to return the radar signal to its original amplitude modulation. Therefore, the system gives a reliable radar detection and at the same time overcomes the limitation of gain characteristics.