Emergency location transceivers (ELT)

• US 20070032220A1
• Filed: 04/25/2006
• Published: 02/08/2007
• Est. Priority Date: 08/03/2005
• Status: Active Grant

• Current Assignee: Kamilo Feher
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Granted Patent: US 7,356,343 B2
• Time in Patent Office: Days
• US Class Current: 455/404.100
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 5/40 Modulation circuits
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

Emergency Location Transceivers (ELT) and communication transceivers (transmitters and receivers) for reception and demodulation of location finder signals, Global Positioning System (GPS) satellite signals and non GPS satellite location finder and other location finder signals. The received location finder signals are demodulated to location finder baseband signals. Baseband signal processors for processing single or a plurality of input signals for providing Orthogonal Frequency Division Multiplex (OFDM) baseband signals, filtered signals, cross-correlated shaped in-phase and quadrature-phase baseband signals and spread spectrum signals. Signal modulators for modulating the processed signals and for providing the modulated signals to the signal transmitter for transmission of the modulated signals. Emergency receiver systems for reception, demodulation and processing of the modulated transmitted signals. Certain emergency receiver embodiments, such as receivers of calls made to emergency call number 911 contain two or more receive antennas for reception and processing of the transmitted modulated signal. In certain embodiments emergency receiver systems have two or more receive antennas operated in a diversity mode, for reception and processing of the transmitted modulated signal.

Claims

1. Emergency location communication system comprising:

a receiver for reception and demodulation of location finder signals to demodulated location finder signals;

a first processor for receiving first bit rate input signals for generating processed Orthogonal Frequency Division Multiplex (OFDM) signals;

a second processor for receiving second bit rate input signals, wherein the second bit rate is different from the first bit rate, connecting said input signals to a filter and providing filtered signals;

a third processor for processing signals comprising emergency communication connection or emergency signals or information or emergency phone numbers;

a fourth processor for processing demodulated location finder signals with the third processor processed signals and the processed OFDM signal;

a selector for selecting the filtered signals or the fourth processor processed signals and connecting the selected signals to a signal modulator; and

a signal modulator for modulating the selected signals and for providing the modulated signals to a signal transmitter for signal transmission.

4. The system of claim 1, wherein said location finder signals comprise signals received from at least one Global Positioning System (GPS) satellite location finder signal transmitter and at least one other, non GPS, location finder signal transmitter.

5. The system of claim 1, wherein said signal transmitter is operated in a linearly amplified mode for transmission of OFDM selected signals and it is operated in non-linearly amplified (NLA) mode for transmission of filtered selected signals.

6. The system of claim 1, wherein said signal transmitter comprises two or more transmit antennas.

7. The system of claim 1, wherein said emergency signals or emergency communication connection or emergency information or emergency phone numbers are 911.

8. The system of claim 1, wherein said Orthogonal Frequency Division Multiplex (OFDM) signals are cross-correlated filtered in-phase and quadrature-phase baseband signals.

9. The system of claim 1, wherein said location finder signals comprise signals received from three satellite Global Positioning System (GPS) signal transmitters.

2. An emergency location finder transceiver system comprising:

a receiver for reception of location finder signals;

a first processor for processing location finer signals;

a second processor for processing input signals and for providing Orthogonal Frequency Division Multiplex (OFDM) signals;

a third processor for receiving input signals and for providing spread spectrum signals;

a fourth processor and selector or combiner for selecting or combining and processing the first processor processed signals with OFDM signals or with spread spectrum signals or with both OFDM signals and spread spectrum signals;

a control unit for control and selection of one of the fourth processor processed signals;

a selector for selecting and providing the fourth processor selected signal to a modulator;

a signal modulator for modulating the selected signal and for connecting the modulated signal to a signal transmitter for signal transmission; and

an emergency or alarm signal receiver for reception, demodulation and processing of the transmitted signal.

10. The system of claim 2, wherein said location finder signals comprise signals received from at least one Global Positioning System (GPS) satellite signal transmitter and at least one other, non GPS, signal transmitter.

11. The system of claim 2, wherein the said emergency or alarm signal receiver comprises two or more receive antennas for reception and processing of the transmitted modulated signal.

12. The system of claim 2, wherein said emergency or alarm signal receiver comprises two or more receive antennas operated in a diversity mode, for reception and processing of the transmitted modulated signal.

13. A system as in claim 2, wherein said spread spectrum signals comprise Code Division Multiple Access (CDMA) signals.

14. The system of claim 2, wherein said emergency or alarm signal receiver comprises a public safety answering point (PSAP) for reception and processing of emergency calls.

3. A location finder, communication system comprising:

a receiver for reception of location finder signals;

a first processor for processing location finder signals;

a second processor for processing an input signal and for providing processed Orthogonal Frequency Division Multiplex (OFDM) signals;

a third processor for processing an input signal and for providing processed cross-correlated shaped in-phase and quadrature-phrase signals;

a fourth signal processor and selector for selecting and processing the first processor processed signals, with processed OFDM signals or with processed cross-correlated signals;

a modulator for modulating the fourth processor selected processed signals and for providing the modulated signal to a transmitter for signal transmission.

15. The system of claim 3, wherein said location finder signals comprise signals received from at least one Global Positioning System (GPS) satellite signal transmitter and at least one other, non GPS, signal transmitter.

16. The system of claim 3, wherein the said transmitter transmits signals to an emergency receiver system comprises two or more receive antennas for reception and processing of the transmitted modulated signal.

17. The system of claim 3, wherein said transmitter transmits signals to an emergency receiver system comprises two or more receive antennas operated in a diversity mode, for reception and processing of the transmitted modulated signal.

18. The system of claim 3, wherein said transmitter transmits signals to an emergency receiver system comprising a public safety answering point (PSAP) for reception and processing of emergency calls.

19. The system of claim 3, wherein said processed cross-correlated shaped in-phase and quadrature-phase signals are used in the Global Mobile System (GSM).

20. The system of claim 3, wherein said cross-correlated shaped in-phase and quadrature-phase signals are Gaussian shaped or Gaussian filtered signals.