Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1985-12-05
1987-07-14
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342 26, G01S 734
Patent
active
046805885
ABSTRACT:
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.
REFERENCES:
patent: 3719942 (1973-03-01), Herman et al.
patent: 3781882 (1973-12-01), Holberg
patent: 3786506 (1974-01-01), Effinger et al.
patent: 3944942 (1976-03-01), Chudleigh
patent: 4058809 (1977-11-01), Chudleigh
patent: 4062011 (1977-12-01), Preston et al.
patent: 4144533 (1979-03-01), Van Hijfte et al.
patent: 4233604 (1980-11-01), Lepere
Dawson Walter F.
Hellner Mark
Raytheon Company
Sharkansky Richard M.
Tubbesing T. H.
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