This paper studies the step-tune method used in Digital Automatic Gain Control (DAGC) system in depth, andpresents an improved method named shift-step-tune which is bases on double-threshold step-tune. Subsequently,we derive the regions for gain stability and provide the criteria for both single-threshold and double-thresholdstep-tune method through statistic calculation and performance analysis. And then validate them by computersimulation and SAR data image.
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