Patent
Dynamic range control system
D Effinger,N Evans,V Estrick +2 more
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TLDR
An automatic dynamic range control system for eliminating dynamic gain limitations that may provide undesirable effects in the moving target indicator or video processor portions of a radar system is presented in this article. But, the system is not suitable for the use of radar data.Abstract:
An automatic dynamic range control system for eliminating dynamic gain limitations that may provide undesirable effects in the moving target indicator or video processor portions of a radar system. A separate auxiliary measurement channel is provided in parallel with the main IF channel having a logarithmic amplifier or sequential logarithmic detector with sufficient dynamic range to meet the signal requirements. At each range bin in the auxiliary channel, the IF signal is quantized in amplitude above the predetermined dynamic range of the main channel by selecting relatively large input signal level ranges which, in the system, provides a relatively low quantizing accuracy without substantially decreasing the system reliability. The quantized levels are then passed through a switch which selects the last PRF interval used for a fill pulse (such as in an MTI system) and places the quantized signals into a 1/PRF shift register. The quantized levels are then used in subsequent sweeps of the dwell period during each range bin to attenuate signals in the main IF channel that would be limited by gain characteristics of that channel. By utilizing predetermined gain control quantized values for an entire dwell period, undesired amplitude modulations that may affect the moving target indicator or processing operation are eliminated.read more
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