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专利名称：Automatic gain control for digital radar
intercept receivers
发明人：Pierre Lavoie申请号：US09385441申请日：19990830公开号：US06191725B1公开日：20010220
专利附图：
摘要：An automatic gain control (AGC) circuit for electromagnetic wave receivingsystems, such as radar warning receivers, has a number of N parallel paths to whichanalog IF input signals are applied with each path being connected to one of N inputs of
an output switch. Each path contains a free running sampling analog-to-digital converter(ADC) that digitizes an amplified analog IF input, the digitized signals being applied toinputs of digital delay units whose output are supplied to the output switch's inputs. Theamplification in each of the N paths is fixed and staggered to provide different fixedamplifications of the IF input to the ADCs. The AGC has a leading edge trigger (LET), atrailing edge trigger (TET) and a track-and-hold circuit that samples and holds theamplitude of an input pulse starting at the leading edge as demarked by the LET. Writingof the digitized signal from the ADCs into digital delay units is started and stopped bysignals from a control circuit based on a pulse's LET and TET. A pulse's TET activates thecontrol circuit which compares the sampled and held amplitude in the track-and-holdcircuit to references levels and selects a gain setting amongst the N paths that producedthe largest digitized version of the analog IF pulse without ADC over-range. The controlcircuit then sets the output switch to the selected path and reads the data in that pathout to provide a pulse-to-pulse AGC signal.
申请人：HER MAJESTY THE QUEEN IN RIGHT OF CANADA, AS REPRESENTED BYMINISTER OF NATIONAL DEFENCE OF HER MAJESTY'S CANADIAN GOVERNMENT
代理机构：Larson & Taylor, PLC
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