公开(公告)号：CA2564287A1

公开(公告)日：1998-05-08

申请号：CA2564287

申请日：1997-10-15

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： SHIBA MICHAEL ,  WERBACK ANDREW ,  PINARD PATRICK ,  HEIMAN FREDERIC ,  BEACH ROBERT

IPC: H04Q7/22 ,  H04L12/28 ,  H04L12/54

公开(公告)号：AT428160T

公开(公告)日：2009-04-15

申请号：AT05851579

申请日：2005-11-10

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： WERBACK ANDREW

IPC: G08G5/04

Abstract: Methods and apparatus are provided for a traffic warning system (TWS) for light aircraft. The TWS comprises a processor coupled to a transceiver, adapted to measure signal strength and send/receive messages containing station ID and preferably altitude and position data. Memory, display and various flight data instruments, such as GPS, altimeter, etc., are also coupled to the processor. The transceiver-processor automatically identifies TWS equipped aircraft within range using an ad-hoc network and exchanges ID and position information. The processor determines range from signal strength and/or received position information and, given enough data, determines direction, altitude, speed, etc., of the other aircraft, which it presents to the pilot. These values and their rate of change are compared to stored alarm thresholds, and the pilot is warned when another aircraft triggers the threshold. Evasive action is recommended where possible.

公开(公告)号：CA2564287C

公开(公告)日：2010-08-24

申请号：CA2564287

申请日：1997-10-15

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： HEIMAN FREDERIC ,  PINARD PATRICK ,  WERBACK ANDREW ,  SHIBA MICHAEL ,  BEACH ROBERT

IPC: H04L12/28 ,  H04L12/54

Abstract: A wireless communications network comprising a mobile unit and a base unit, a first one of said units being arranged to transmit a message to a second one of said units, said message having associated with it a coded portion representative of possible responses to the message, and said second unit being arranged to decode said coded portion and to offer to a user a plurality of options corresponding to said possible responses.

公开(公告)号：CA2218268C

公开(公告)日：2007-01-16

申请号：CA2218268

申请日：1997-10-15

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： PINARD PATRICK ,  WERBACK ANDREW ,  SHIBA MICHAEL ,  BEACH ROBERT ,  HEIMAN FREDERIC

IPC: H04Q7/22 ,  H04L12/28 ,  H04Q7/32

Abstract: A communication network comprising a cellular local area wireless netwo rk includes a plurality of access points connected to a housed computer and eac h other, and a plurality of mobile units each mobile unit being arranged for association with an access point. The mobile units are arranged to periodically scan for and identify t he most eligible access point for association on the basis of the criteria of best quality signal strength and loading factor. In order to identify when mobile units are bein g removed from a predetermined area, access points having directional antennae are situated adjacent exit points to detect when mobile units are in a vicinity. Each mobile unit may include paging facilities, including the capability of transmitting information in a coded form known both to the unit and to a host, and power-saving facilities.

公开(公告)号：CA2218268A1

公开(公告)日：1998-05-08

申请号：CA2218268

申请日：1997-10-15

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： PINARD PATRICK ,  BEACH ROBERT ,  WERBACK ANDREW ,  HEIMAN FREDERIC ,  SHIBA MICHAEL

IPC: H04L12/28 ,  H04Q7/22 ,  H04Q7/32

Abstract: A communications network comprising a cellular local area wireless network includes a plurality of access points connected to a housed computer and each other, and a plurality of mobile units each mobile unit being arranged for association with an access point. The mobile units are arranged to periodically scan for and identify the most eligible access point for association on the basis of the criteria of best quality signal strength and loading factor. In order to identify when mobile units are being removed from a predetermined area, access points having directional antennae are situated adjacent exit points to detect when mobile units are in a vicinity. Each mobile unit may include paging facilities, including the capability of transmitting information in a coded form known both to the unit and to a host, and power-saving facilities.