Adaptive gain control for radiometric target tracking system
AssigneeSperry Rand Corporation
InventorsRobert S. Roeder, Lucien C. Bomar, II
Life of this patent
Estimating the term…
Abstract
The improved radiometric target seeking system incorporates automatic gain control features including phase tracking automatic gain and automatic gain scan amplitude controls in a system which is basically a dual-axis, gimballed, conical-scan radiometric sensor designed to operate in either active or passive modes and to provide angular line-of-sight rate steering signals to guidance control apparatus. Target-derived automatic gain control signals permit separation of desired stationary target signals from significant background clutter, and a unique adaptive processor minimizes degradation of tracking response and accuracy.
Claims11
High frequency radiometric target tracking apparatus of the kind including conically-scanned gimbal-mounted antenna means, radiometric receiver means responsive to said antenna means, target tracking servo loop means responsive to said radiometric receiver means for positioning said antenna means about first and second axes, said target tracking apparatus additionally including:
- system clock means,
- conical scan motive means responsive to said system clock means,
- first demodulator means responsive to said radiometric receiver means and to said conical scan motive means,
- integrator means responsive to said first demodulator means,
- servo means responsive to said integrator means for positioning said gimbal-mounted antenna means about at least said first axis,
- automatic gain control signal generator means additionally responsive to said first demodulator means,
- frequency divider means additionally responsive to said system clock means for producing a first frequency signal,
- signal amplitude divider means responsive to said frequency divider means and to said automatic gain control means for producing a quotient output, and
- first signal adder means in series relation with said integrator means and said servo means and responsive to said signal amplitude divider means for supplying a combined output for control of said servo means.
Dependencies are inferred from the claim text.