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:

44293127, Jan 31, 1984

Filed:

Jul 24, 1981

Appl. No.:

6/286312

Inventors:

John P. Chisholm - Olympic Valley CA

International Classification:

G01S 116

US Classification:

343410

Abstract:

An independent landing monitoring system (ILM) for guiding airborne vehicles on final approach to a landing using a ground-based beacon which transmits a sequence of pulse signals including an omnidirectional signal coded to identify its location and used for initial approach, followed by time spaced directionally radiated right/left and up/down signals used for precision guidance along the final approach path. The time spacing of the various beacon signals and their order of succession in the sequence identify the signals, and the relative intensities of paired precision guidance signals as received by the aircraft is used to provide precision indications of the location of the aircraft on the path. The beacon can be either triggered by the weather radar in the aircraft which then receives the beacon signals on its beacon mode receiver, and/or it can be triggered randomly by a noise jittered oscillator in the beacon for use by approaching aircraft equipped only with a beacon receiver but no weather radar.

US Patent:

47231262, Feb 2, 1988

Filed:

Oct 8, 1986

Appl. No.:

6/916578

Inventors:

John P. Chisholm - Olympic Valley CA

Assignee:

Sundstrand Data Control, Inc. - Redmond WA

International Classification:

G01S 116

US Classification:

342408

Abstract:

The invention provides independent guidance and monitoring integrated into an MLS landing system and a scaled-down MLS take-off or missed approach guidance system useable at small airports. 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 (80 and 81), oriented to left and right of a prescribed guidance path. The paired beams overlap at the prescribed guidance path in such a manner that an aircraft departing or making a missed approach on such path will intercept equal signal intensities to indicate an on-course condition. Conversely, when the aircraft is off-course to one side of the prescribed path, it will intercept a stronger signal intensity for the fixed guidance beam which is directed to that side of the prescribed path and a weaker signal intensity for the fixed beam which is directed to the other side of the prescribed path.

US Patent:

45104999, Apr 9, 1985

Filed:

May 7, 1981

Appl. No.:

6/261619

Inventors:

John P. Chisholm - Olympic Valley CA
Donald G. Morgan - Reston VA

Assignee:

Vega Precision Laboratories, Inc. - Vienna VA

International Classification:

H04B 700

US Classification:

343456

Abstract:

The instant invention permits a communication function to be performed by utilizing the transmitter/receiver portion of existing navigational equipment such as, for example, DME equipment, TACAN/DME equipment, and VOR/DME equipment. Rather than utilizing the same channel as the navigation function, the communication function utilizes another of the equipment's channels specifically assigned for communication purposes. Specifically, when it is desired to communicate with a communication or master station, the airborne or remote navigational equipment is momentarily turned from the navigational frequency channel to the frequency channel specifically assigned for the communication function. While momentarily tuned to the communication channel, it sends data to, and receives data from, the communication station. Having completed the communication process, the airborne or remote unit tunes back to the navigational channel and resumes its navigational function.

US Patent:

46350640, Jan 6, 1987

Filed:

Apr 4, 1985

Appl. No.:

6/719849

Inventors:

John P. Chisholm - Olympic Valley CA

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.

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.

US Patent:

50140671, May 7, 1991

Filed:

Mar 12, 1990

Appl. No.:

7/493044

Inventors:

John P. Chisholm - Olympic Valley CA

Assignee:

Sundstrand Data Control, Inc. - Redmond WA

International Classification:

G01S 108

US Classification:

342407

Abstract:

An integrated landing system interleaves signals encoded in a first format such as the microwave landing system that (MLS) format with signals encoded in a second format such as the precision tactical approach guidance (PTAG) format to permit approach guidance information to be transmitted to aircraft having either MLS receivers or PTAG receivers.

US Patent:

49909215, Feb 5, 1991

Filed:

May 1, 1987

Appl. No.:

7/045911

Inventors:

John P. Chisholm - Olympic Valley CA

Assignee:

Sundstrand Data Control, Inc. - Redmond WA

International Classification:

G01S 114
G01S 1380
G01S 1393

US Classification:

342 35

Abstract:

A guidance system for landing an aircraft is described which uses a source of signals identifiable with the aircraft and a ground station which is linked to the aircraft. Specifically, the ground station includes a receiver which is connected to one or more pairs of antennas having a fixed, overlapping, directional sensitive pattern symmetically located relative to the center of the landing path, a receiver and a processor for measuring the relative sensitivity of the signals received at the antennas and for using the relative signal intensity to determine the location of the aircraft relative to the center of the landing path.