Joseph E Lester

US Patent:

46821740, Jul 21, 1987

Filed:

Oct 7, 1985

Appl. No.:

6/785125

Inventors:

Carl T. Richmond - Scottsdale AZ
Joseph O. Lester - Mesa AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G01S 1352

US Classification:

342160

Abstract:

A surface acoustic wave (SAW) device in a pseudo-coherent moving target indicator uses a common input transducer to delay both reference and signal inputs to a mixer by varying amounts. The mixer produces a Doppler signal which is processed within a single range cell. The SAW device may contain additional delay paths which drive other range cells. Power splitting and amplification sections of the moving target indicator are minimized through use of the SAW device.

US Patent:

57900736, Aug 4, 1998

Filed:

Mar 13, 1996

Appl. No.:

8/627218

Inventors:

Daniel Richard Tayloe - Phoenix AZ
Dean Paul Vanden Heuvel - Chandler AZ
Joseph Olk Lester - Mesa AZ
Scott David Blanchard - Mesa AZ
Johanna Alexandra Wild - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G01S 502

US Classification:

342357

Abstract:

A system (28) provides communication services to mobile units (24). Mobile units (24) perform a unit-based location process (46, 48) to determine their locations. The system (28) performs a system-based location process (64, 66) to independently determine mobile unit locations. The system-based process may determine location less precisely than the unit-based process. A location selection process (104) evaluates the unit-determined location in view of a system-determined location error region to decide whether the unit-determined location is reliable. If the unit-determined location is reliable, it is used (120) to qualify communication services to be provided to the mobile unit (24). If the unit-determined location is unreliable, the system-based process is repeated (116) to improve the system-determined location precision, and the resulting system-determined location is used (118) to qualify communication services to be provided to the mobile unit (24).