An automatic gain control for digital radar intercept receivers

Details An automatic gain control for digital radar intercept receivers An automatic gain control for digital radar intercept receivers

H - Electricity

03

G

H03G 3/20 (2006.01) G01S 7/02 (2006.01) G01S 7/285 (2006.01) G01S 7/34 (2006.01) H03G 3/30 (2006.01)

Patent

CA 2281238

An automatic gain control (AGC) circuit for electromagnetic wave receiving systems, such as radar warning receivers, has a number of N parallel paths to which analog 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 to inputs of digital delay units whose output are supplied to the output switch's inputs. The amplification in each of the N paths is fixed and staggered to provide different fixed amplifications of the IF input to the ADCs. The AGC has a leading edge trigger (LET), a trailing edge trigger (TET) and a track-and-hold circuit that samples and holds the amplitude of an input pulse starting at the leading edge as demarked by the LET. Writing of the digitized signal from the ADCs into digital delay units is started and stopped by signals from a control circuit based on a pulse's LET and TET. A pulse's TET activates the control circuit which compares the sampled and held amplitude in the track-and-hold circuit to references levels and selects a gain setting amongst the N paths that produced the largest digitized version of the analog IF pulse without ADC over-range. The control circuit then sets the output switch to the selected path and reads the data in that path out to provide a pulse-to-pulse AGC signal.

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