초록 ▼

The efficient and secure operation of facilities such as roads, pipelines, etc., will increasingly require reliable and low cost means for distribution and collection of operational data along the facility. A method using simplex, party-line transmission of electromagnetic signals for distributing a

The efficient and secure operation of facilities such as roads, pipelines, etc., will increasingly require reliable and low cost means for distribution and collection of operational data along the facility. A method using simplex, party-line transmission of electromagnetic signals for distributing and collecting data packet messages is described which, in the case of random failures, automatically seeks out alternate routes. The system incorporates double and single end-of-message codes that cue the insertion of new messages, primary and secondary routes that are pre-determined by relative path losses and no-message timing signals, transmitted for phase locking and received signal level referencing purposes. The alternate routes are established by adjustable, enhanced antenna, or lens, side lobes. Alternate routing is triggered by an automatic gain control circuit. A preferred binary modulation, message format and station design are described. A method for automatically bridging in-line failed stations that use microwave transmissions is also described.

대표청구항 ▼

A simplex, party-line transmission system, using line-of-sight electromagnetic propagating signals, collects and distributes digital data packets and automatically seeks out alternate routing, is comprised of, a starting terminal and an ending terminal and a multiplicity of intermediary stations, ea

A simplex, party-line transmission system, using line-of-sight electromagnetic propagating signals, collects and distributes digital data packets and automatically seeks out alternate routing, is comprised of, a starting terminal and an ending terminal and a multiplicity of intermediary stations, each with the capability of receiving and inserting message packets, and passing along all accumulated messages, a preferred route along said intermediary stations, that is determined by minimum path loss and station proximity, alternate routes that are established by paths with significantly higher transmission path losses than for said preferred route, an identifiable signal, transmitted from all stations during non-message intervals to provide timing and received signal strength information, a means for accepting the strongest signals received at each station for retransmission, an indicating means for determining when local data packets can be inserted into the message stream for all preceding conditions, and a means for temporarily stopping data transmission during sensed failure conditions and restarting transmission when normal operating conditions are restored.