Method and apparatus for simplex delivery of signals to obstructed geographical areas

US5784028A · kind A · utility

Assignee

• Motorola, Inc. · US

Inventors

• David W. Corman · Gilbert, US
• Bary R. Bertiger · Scottsdale, US
• Dean Lawrence Cook · Mesa, US
• Norbert Kleiner · Scottsdale, US
• Kristine P. Maine · Phoenix, US

Key dates

• Filing date: Jun 27, 1996
• Grant date: Jul 21, 1998
• Expiry date: Jun 27, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/18552
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A system (10) and method delivers simplex signals (26, 28) to a communication unit (24) located within an area (20) (e.g., a building) where an obstruction exists between the signal transmitter (12, 18) and the communication unit (24). The system (10) uses an infrastructure retransmission apparatus (14, 16, 22) to receive (204, 304, 402, 404) the signals (26, 28) and retransmit (208, 310, 410) them within the area (20). Geolocation signals (26) from navigation satellites (12) can be retransmitted (208, 310) using the infrastructure retransmission apparatus (14, 16, 22), thus enabling a communication unit (24) located within an obstructed area (20) to calculate its position.