Patent US3648031A successfully refreshed from Google Patents.
US3648031A
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Control system filtering technique
Assignee: Collins Radio Co
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Filing: 1970-10-30
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Granted: 1972-03-07
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Expires: 1990-10-30
Abstract
Abstract A control system filtering technique permits heavy noise filtering of a position input signal without introduction of system instabilities. A rate of change of the filtered position signal is derived and utilized in a feedback loop to complement the signal from which the rate signal was derived, permitting heavy position signal filtering without position loop phase lag and thus effectively separating the problem of generating a tight control from the sensor noise problem.
Inventors
- 👤 Gordon L Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:48
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1445; G05D1/00; G05D1/08; G05D1/0808; G05D1/0816
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
In a control system wherein a position input signal is heavily filtered to remove high frequency noise perturbations thereon, means for deriving a rate signal from said filtered position signal, means for applying said derived rate of change of position signal in a feedback loop to complement the position input signal from which said rate signal was derived, and means for adding said derived rate of change of position signal to said filtered position signal to provide a position and rate output signal the phase lag of which with respect to said input position signal is minimized.
Claim 2
Dependent Claim
97 words
In a control system wherein a position input signal is heavily filtered to remove high frequency noise perturbations thereon, means for deriving a rate signal from said filtered position signal, means for applying said derived rate of change of position signal in a feedback loop to complement the position input signal from which said rate signal was derived, and means for adding said derived rate of change of position signal to said filtered position signal to provide a position and rate output signal the phase lag of which with respect to said input position signal is minimized.
Claim 3
Dependent Claim
108 words
In a control system, means for deriving from a noisy position input signal an output position and rate signal from which noise is heavily filtered without introducing position-loop phase lag, comprising means for low-pass filtering said position input signal, means for deriving a rate of change of positioN signal from at least said low pass filtered position input signal, means summing said derived rate of change of position signal with said low pass filtered position signal to provide said output position and rate signal, and means for summing said derived rate of change of position signal with said position input signal as applied to said low-pass filtering means.
Claim 4
Dependent Claim
108 words
In a control system, means for deriving from a noisy position input signal an output position and rate signal from which noise is heavily filtered without introducing position-loop phase lag, comprising means for low-pass filtering said position input signal, means for deriving a rate of change of positioN signal from at least said low pass filtered position input signal, means summing said derived rate of change of position signal with said low pass filtered position signal to provide said output position and rate signal, and means for summing said derived rate of change of position signal with said position input signal as applied to said low-pass filtering means.
Claim 5
Dependent Claim
77 words
Signal derivation means as defined in claim 2 wherein said means for deriving a rate of change of position signal comprises a signal proportional to inertial acceleration, means for low pass filtering said acceleration signal, means for high pass filtering said low-pass filtered position input signal, summing means receiving said low-pass filtered acceleration signal and the output of said high-pass filtering means, the output of said summing means comprising said derived rate of change of position signal.
Claim 6
Dependent Claim
52 words
Signal derivation means as defined in claim 3 wherein said position low pass filtering means comprises a second order filter and further comprising means for summing said inertial acceleration signal and said derived rate of change of position feedback signal with said input position signal for application to said low-pass filtering means.
References Cited (Backward Citations)
US3296422A
Cited
US3446946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |