John P Chisholm

US Patent:

20030176198, Sep 18, 2003

Filed:

Mar 14, 2003

Appl. No.:

10/388550

Inventors:

John Chisholm - Reno NV, US

International Classification:

H04Q007/20

US Classification:

455/463000, 455/464000

Abstract:

A method for communication involving a plurality of communication devices. A common time base is established among the communication devices and the common time base is then arranged into a repeating cycle of time intervals. The time intervals are arranged into a number of time slots. In one embodiment, at least one time slot is designated as unique and the communication devices are tuned from a first frequency to a second frequency on the occurrence of the unique time slot and the communication devices may receive during the unique time slot. In another embodiment, a time slot is assigned to each communication device, the time slot is unique to each communication device. The communication device is tuned from a first frequency to a second frequency on the occurrence of the communication device's unique time slot and the communication device may transmit during the unique time slot.

US Patent:

RE334014, Oct 23, 1990

Filed:

Dec 19, 1988

Appl. No.:

7/286721

Inventors:

John P. Chisholm - Reno NV

Assignee:

Sundstrand Data Control, Inc. - Redmond WA

International Classification:

G01S 116

US Classification:

342408

Abstract:

The invention provides independent guidance and monitoring to be integrated into an MLS landing system and also provides a scaled-down MLS landing guidance system useable at small airports. In both cases an added fixed beam precision guidance system is integrated into the MLS time sequence format. The fixed beam guidance system is based upon the concept of using paired fixed overlapping beams, sequentially radiated by different fixed antennas. One pair is oriented to left and right of the centerline of the runway, and the other pair is oriented above and below the desired glideslope. The first set of paired beams overlap at the centerline of the runway in such a manner that an aircraft approaching exactly on centerline will intercept equal signal intensities to indicate an on-course approach. Conversely when the aircraft is off-course to one side of the centerline, it will intercept a stronger signal intensity for the fixed guidance beam which is directed to that side of the centerline and a weaker signal intensity for the fixed beam which is directed to the other side of the centerline. Similar operation is provided by the overlapped guidance beams operating in the elevation mode.