Alison Bayer Brown

US Patent:

46342834, Jan 6, 1987

Filed:

Mar 19, 1984

Appl. No.:

6/590111

Inventors:

John G. Mark - Pasadena CA
Alison K. Brown - Monument CO
Anthony Matthews - Calabasas CA

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

G01C 1964

US Classification:

356350

Abstract:

The use of a high speed moving average filter is shown to filter high speed errors, including white noise in angle and quantization errors, from the output data of a ring laser gyro while it is being tested. The filtered data permits investigation of the lower speed, random walk in angle error of the gyro being tested. For best results, several moving average filters are connected in series.

US Patent:

47542802, Jun 28, 1988

Filed:

Sep 10, 1982

Appl. No.:

6/416646

Inventors:

Alison K. Brown - Malibu CA
W. Michael Bowles - Long Beach CA
Tom P. Thorvaldsen - Hingham MA

Assignee:

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

International Classification:

G01S 502
H04B 7185

US Classification:

342357

Abstract:

An attitude sensing system which incorporates the precision in attitude sensing of a satellite navigation system with the dynamic tracking capabilities of an inertial measurement unit. Optimally estimated attitude and system error signals are combined with the outputs of an inertial measurement unit to control the phase differences of signals received on an interferometer array from a navigation satellite. The outputs from the inertial measurement unit and the phase differences are processed in an optimal estimator filter to produce periodically updated attitude and system error signals. This permits inertial attitude sensing to benefit from the long term accuracy of attitude estimation based upon signals from the satellite navigation system. During conditions of high dynamic maneuvering in which attitude changes are rapid, the output of the inertial measurement unit continues to provide attitude information and controls the attitude sensing loop to insure that the system is not disoriented by such high dynamic conditions.

US Patent:

48621781, Aug 29, 1989

Filed:

Jun 27, 1988

Appl. No.:

7/211814

Inventors:

Mark A. Sturza - Woodland Hills CA
Alison K. Brown - Monument CO

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

H04B 7185

US Classification:

342357

Abstract:

A codeless digital method and apparatus for obtaining measured phase from a plurality of L2 signal transmissions. An intermediate frequency signal is derived by mixing the L2 transmissions with a local oscillator. That signal is hardlimited and employed to terminate the count of a divide-by-32 counter that is clocked by the local oscillator signal and initiated by a signal in synchronization therewith whose frequency is a fraction of the local oscillator. The state of the counter is applied to a four bit latch. The state of the latch, which effectively discards the most significant bit of the count, provides the measured phase of the L2 transmissions from which position can be obtained by reference to the satellite phase and delta range values derived therefrom.

US Patent:

46460969, Feb 24, 1987

Filed:

Oct 5, 1984

Appl. No.:

6/659231

Inventors:

Alison Brown - Simi Valley CA

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

G01S 502

US Classification:

342357

Abstract:

A circuit is shown which utilizes signals transmitted from global positioning system satellites to create change in phase signals. The change in phase signals are measured over a predetermined time interval, one second, and stored. The stored signals are applied to a Kalman filter and back to the storage unit so that each one second time interval includes the information from all previous time intervals. This accumulated information is referred to as accumulated Delta-Range information which permits a more rapid determination of position by the circuit.