Jeffrey S Pearce

US Patent:

45205060, May 28, 1985

Filed:

Oct 20, 1981

Appl. No.:

6/313327

Inventors:

Luen C. Chan - Indian Harbor Beach FL
Paul B. Beckwith - Indialantic FL
Jeffrey B. Pearce - Melbourne FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G06K 936

US Classification:

382 56

Abstract:

A method and digital system for the compression and reconstruction of cultural data for use with display systems, such as a system for producing a real time moving map display of terrain, provides a modified footprint/common boundary technique for data compression in which the footprint extends forward of the last point generated along a line in the direction of the line to that point. The particular scheme for compressed data reconstruction employs the storage of footprint data in such a manner that change in line direction information is automatically provided along with the necessary delta data information so that the direction of the line can be constantly updated as each point is generated. The compression of area cultural features involves a double compression of data based on a common boundary approach and the linear compression techniques of the modified footprint technique. In addition, in the reconstruction of compressed cultural data, changes in scale factor are accommodated along with feature deselection based on the selected scale factor.

US Patent:

46601570, Apr 21, 1987

Filed:

Nov 13, 1984

Appl. No.:

6/670933

Inventors:

Paul B. Beckwith - Indialantic FL
Kent P. Bascle - Melbourne FL
Jeffrey B. Pearce - Melbourne FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G06F 3153
G06F 1566
H04N 718

US Classification:

364522

Abstract:

A digital system for producing a real-time visual display in perspective of the terrain over which an aircraft is passing on the basis of compressed digital data stored on a cassette tape includes a perspective processor for transforming the addresses of points in a two-dimensional data pattern to the addresses these points occupy in a three-dimensional scene and for a filing in points between the transformed points to provide a complete display of the terrain in perspective.

US Patent:

44893892, Dec 18, 1984

Filed:

Oct 2, 1981

Appl. No.:

6/308166

Inventors:

Paul B. Beckwith - Indialantic FL
Kent P. Bascle - Melbourne FL
Jeffrey B. Pearce - Melbourne FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G06F 3153
H04N 718

US Classification:

364522

Abstract:

A digital system for producing a real-time visual display in perspective of the terrain over which an aircraft is passing on the basis of compressed digital data stored on a cassette tape includes a perspective processor for transforming the addresses of points in a two-dimensional data pattern to the addresses these points occupy in a three-dimensional scene and for filling in points between the transformed points to provide a complete display of the terrain in perspective.

US Patent:

46341102, Jan 6, 1987

Filed:

Jul 28, 1983

Appl. No.:

6/518291

Inventors:

Paul M. Julich - Indialantic FL
Jeffrey B. Pearce - Melbourne FL

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G06F 1516
G06F 1100

US Classification:

371 11

Abstract:

A fault detection and redundancy management system for a dual redundancy based network architecture in which the principal control components (master units) are configured and programmed to repetitively carry out intra- and inter-unit performance tests as an a priori requirement for network command capability. These performance tests are carried out in a prescribed sequence to define the fault detection and reconfiguration procedure. The procedure is designed to preclude the cascading of faults. As a first step in this procedure, each processor in a master unit performs a thorough self-test of its own functional capability. Secondly, if a processor has determined that it has passed all of these internal procedures, it must then successfully inform a designated "chief" processor via an interprocessor handshake. This interprocessor handshake is effected by causing each processor in the master unit to set a flag in a shared memory during a prescribed time interval. These flags are read by the chief processor to determine whether to enable an associated bus controller for the next succeeding time interval, and once these flags have been read they are reset by the chief processor, as each processor is required to refresh the handshake flag during successive repetitive time intervals.

US Patent:

47291273, Mar 1, 1988

Filed:

Aug 20, 1984

Appl. No.:

6/642481

Inventors:

Luen C. Chan - Indian Harbor Beach FL
Paul B. Beckwith - Indialantic FL
Jeffrey B. Pearce - Melbourne FL

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

G06K 936

US Classification:

382 56

Abstract:

A method and digital system for the compression and reconstruction of culal data for use with display systems, such as a system for producing a real time moving map display of terrain, provides a modified footprint/common boundary technique for data compression in which the footprint extends forward of the last point generated along a line in the direction of the line to that point. The particular scheme for compressed data reconstruction employs the storage of footprint data in such a manner that change in line direction information is automatically provided along with the necessary delta data information so that the direction of the line can be constantly updated as each point is generated. The compression of area cultural features involves a double compression of data based on a common boundary approach and the inner compression techniques of the modified footprint technique. In addition, in the reconstruction of compressed cultural data, changes in scale factor are accommodated along with feature deselection based on the selected scale factor.