Randolph Alan Purdy

US Patent:

6789016, Sep 7, 2004

Filed:

Jun 12, 2002

Appl. No.:

10/167905

Inventors:

Carl Raymond Bayh - Ronkonkoma NY
Paul F. Drobnicki - Holbrook NY
Scott Esbin - Massapequa NY
Michael Murphy - Centerport NY
Randolph Purdy - Sayville NY
David Wolff - Hauppauge NY

Assignee:

BAE Systems Information and Electronic Systems Integration Inc. - Greenlawn NY

International Classification:

G06F 1900

US Classification:

701301, 701120, 701 9, 701 14, 340361, 342 30, 342455, 342176

Abstract:

An airborne collision avoidance system includes a receiver stage constructed and arranged to detect (a) at a first radio frequency, first interrogation signals, and first collision resolution advisory (RA) signals transmitted from other nearby aircraft, and (b) at a second radio frequency, first acquisition signals including position information with respect to the nearby aircraft, and first reply signals from the nearby aircraft. A transmitter stage is constructed to produce (a) at the first radio frequency, second interrogation signals and second collision RA signals, and (b) at the second radio frequency, second acquisition signals including position information with respect to the given aircraft, and second reply signals from the given aircraft in response to the first interrogation signals. Tracking and collision avoidance information derived by a system processor from the detected first acquisition and first RA signals is shown on a cockpit display. The receiver and the transmitter stages are coupled to a single pair of upper and lower fuselage antennas through a T/R switch module.

US Patent:

6483454, Nov 19, 2002

Filed:

Nov 28, 2000

Appl. No.:

09/724354

Inventors:

Frank M. Torre - Huntington NY
Randolph A. Purdy - Sayville NY

Assignee:

Bae Systems Aerospace Inc. - Greenlawn NY

International Classification:

G01S 1300

US Classification:

342 30, 342 29

Abstract:

Collision avoidance systems are provided for groups of aircraft operating in close proximity, as during formation flights or cooperative missions. Fixed and rotary airfoil aircraft with separations of 30 feet to 5 miles, for example, participate in a local radio sub-net. An aircraft receiving CAS sub-net signals derives signal transit time values representing differences between send and receive times and which are used to derive data on inter-aircraft range and closing rate. With synchronized clocks, highly-accurate one-way ranging uses assigned time slots with predetermined sub-net time-of-day timing of transmissions. Round-trip ranging operates with less accurate time synchronization, and systems may operatively select between one-way and round-trip ranging. By exchange of range and closing rate data among aircraft, 3-D data for current three-dimensional location of aircraft enables evasive action determination. Data is thus made available for provision of audio and visual flight crew communications indicating alerts and warnings of impending collision danger and appropriate evasive action.