G - Physics – 01 – S
Patent
G - Physics
01
S
343/22, 343/9
G01S 7/28 (2006.01) G01S 7/292 (2006.01) G01S 7/34 (2006.01) G01S 13/95 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1271547
Abstract of the Invention A radar receiver having a feed-forward control circuit for adjusting the automatic gain control (AGC) setting in 6 dB increments for each range cell in a next sweep based on the AGC setting of each corresponding range cell in the present sweep, the magnitude of the larger of the in-phase (I) or quadrature (Q) components of the video signals of the present sweep from an A/D converter, the status of present sweep and previous sweep A/D limit conditions, and a selected guardband thereby holding the level of the radar return signal within the dynamic range of the A/D converter. The AGC setting is adjusted using a switchable attenuator which changes the level of the video signal into the A/D converter in 6 dB increments, each increment corresponding to a common I and Q data exponent directly used for floating point signal processing. A pulse interference detection and signal replacement apparatus and method utilizes an 8-bit log magnitude representation of each range cell sample generated from a floating point exponent and reduced precision mantissa components to detect a range cell pulse of interference at a specific range M and causes replacement of the range cell sample with an interpolated value determined from the average of the radar return signals of adjacent sweeps at range M.
523064
Cantwell Robert H.
Raytheon Company
Smart & Biggar
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