Method of and apparatus for two-way radio communication amongst fixed base and mobile terminal users employing meteor scatter signals for communications inbound from the mobile terminals and outbound from the base terminals via Loran communication signals

• US 5,278,568 A
• Filed: 05/01/1992
• Issued: 01/11/1994
• Est. Priority Date: 05/01/1992
• Status: Expired due to Fees

• Current Assignee: Megapulse, Inc.
• Original Assignee: Megapulse, Inc.
• Inventors: Enge, Per K., Bussgang, Julian J., Johannessen, Paul R.
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US07/877,829
• Time in Patent Office: 620 Days
• Field of Search: 342/388, 342/389, 342/391, 342/367, 342/450, 342/453, 342/457, 364/752, 455/54, 455/54.1
• US Class Current: 342/367
• CPC Class Codes: G01S 1/04 Details
• CPC Class Codes: G01S 1/24 the synchronised signals being pulses or equivalent modulations on carrier waves and the transit times being compared by measuring the difference in arrival time of a significant part of the modulations , e.g. LORAN systems
• CPC Class Codes: G01S 5/0009 Transmission of position information to remote stations involving assistance data G01S5/0236
• CPC Class Codes: H04B 7/22 Scatter propagation systems , e.g. ionospheric, tropospheric or meteor scatter

Abstract

A method of and apparatus for two-way radio meteor scatter communication amongst mobile transceiver-equipped terminals and fixed meteor scatter base terminal(s) that comprises communicating high volume point-to-point inbound information from the mobile terminals to the base terminal(s) and outbound information from the base terminal(s) to particular mobile terminals by radio meteor scatter, and broadcasting outbound information from the base terminal(s) to many mobile terminals by supplemental Loran communications short messages modulated upon Loran radio positional and navigation transmissions.

Claims

1. A method of two-way radio meteor scatter communication amongst mobile transceiver-equipped terminals and fixed meteor scatter base terminal(s) that comprises communicating inbound information from the mobile terminals to the base terminal(s) by meteor scatter communication, and communicating outbound information from the base terminal(s) to all mobile terminals by meteor scatter communication and by supplemental Loran communications messages modulated upon Loran radio positional and navigation transmissions.

2. A method as claimed in claim 1 and in which the information for said Loran communications messages is provided from the meteor scatter base terminal(s) by linking such base terminal(s) to a Loran transmission site.

3. A method as claimed in claim 2 and in which the inbound information communicated from the mobile terminals to the base terminal(s) comprises one or both of mobile status messages and positional data developed from the Loran positional and navigation transmissions received at any mobile terminal.

4. A method as claimed in claim 1 and in which the meteor scatter communications are used to carry high volume traffic from the base(s) to individual mobile terminals.

5. A method as claimed in claim 2 and in which the station transmitting the Loran communications messages is linked by telephone lines to the meteor scatter base terminal(s) to receive commands therefrom.

6. A method as claimed in claim 3 and in which an automatic vehicle or vessel location system is linked to the meteor scatter base terminal(s) and the Loran station(s), and the inbound data communicated from the mobile terminals includes position estimates based on Loran-C positional and navigation transmissions and the identity of the communicating mobile terminal.

7. A method as claimed in claim 6 and in which the Loran communications messages provide the mobile terminals with propagation and timing correction information to improve the precision of the mobile terminal position fixes and navigational data derived from one or more of the Loran transmissions satellite and other navigational radio transmissions.

8. A method as claimed in claim 6 and in which the base terminals apply differential Loran corrections to the estimated fixes received from the mobile terminals and communicate the same outbound by the Loran communications messages.

9. A method as claimed in claim 4 and in which the Loran communications messages transmit one or more of reports, instructions, and inquiries intended to relay important messages and/or control the mobile terminals in the network and the schedule, frequency and/or format of the meteor scatter communications, in order to increase the capacity and improve the efficiency of meteor scatter communications from the mobile terminals to the base terminals and from one mobile terminal to another.

10. A method as claimed in claim 4 and in which the Loran communication messages comprise acknowledgments that the base terminal(s) received meteor scattered inbound signals from mobile terminals.

11. Apparatus for two-way radio meteor scatter communication amongst mobile transceiver-equipped terminals and fixed meteor scatter base terminals having, in combination with a system comprising the transmission link of information between the mobile terminals and the base terminals by radio meteor scatter, the supplement of a Loran radio positional and navigation transmitter system incorporating means for generating Loran communications messages, incorporating information provided by the base terminals, simultaneously transmitted outbound with the positional and navigation transmission to the mobile terminals.

12. Apparatus as claimed in claim 11 and in which means is provided for communicating inbound to the meteor scatter base stations positional data developed from the Loran positional and navigation transmissions received at each mobile terminal.

13. Apparatus as claimed in claim 12 and in which the Loran communications messages comprise acknowledgments that the base terminals received meteor scattered inbound signals from mobile terminals.

14. Apparatus as claimed in claim 12 and in which the Loran communications messages comprise position location correctional data.

15. Apparatus as claimed in claim 11 and in which the meteor scatter base terminals are telephone-linked to the station transmitting the Loran communications messages.

16. Apparatus as claimed in claim 12 and in which the base terminals and the station transmitting the Loran communications messages are linked with an automatic vehicle location system for monitoring and tracking the positional and other data from the mobile terminals, with the Loran communications messages enabling outbound communications with the mobile terminals.

17. Apparatus as claimed in claim 16 and in which means is provided for enabling the Loran communications messages to contain propagation and timing correction information for the mobile terminals to improve the precision of their position fixes derived from one or more of the Loran positional and navigation transmissions, satellite positional transmissions, and other navigational radio transmissions.

18. Apparatus as claimed in claim 16 and in which means is provided for controlling the Loran communications messages by modulations responsive to commands received from one or both of the base terminals and the automatic vehicle location system.