Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1997-01-10
1999-02-09
Ip, Paul
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318577, 340347XY, 250202, 358 75, G05B 100
Patent
active
058699457
ABSTRACT:
A scanner which includes a motor for driving a load and circuitry for providing a position error signal responsive to the difference between a predicted position of the load and the actual position of the load, preferably a mirror scanning a scene. The motor is driven in response to the position error signal. The position error signal is provided plural times during a single scanning of the scene. The circuitry for providing a position error signal includes a closed loop filter system for filtering the error signal to provide a filtered error signal, an adaptive filter system for operating on the filtered error signal to provide an adaptively filtered error signal and summing circuitry for summing signals indicative of the predicted position, the filtered error signal and the adaptively filtered error signal. The closed loop filter system includes, in series, at least one first order lead lag filter and a double integral plus proportional filter. The adaptive filter system includes, in series, a low pass filter, a register and an integrator.
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Gohlke Mark A.
Ha Humphrey Wing-Hong
Herrington Gary R.
Jenkins Steven
Kuemmerle Keith R.
Ip Paul
Raytheon TI Systems Inc.
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