System and method for remote control of locomotives
The present invention is directed to the remote control of locomotives, and more particularly to various methods and apparatus employed in implementing systems for such remote control. Contemplated in the present invention are systems and methods for not only reliable remote-control communications, but also the use of repeaters and communications servers to assure reliable, centralized communication between locomotives and operator control units. In another embodiment, there is described a reliable distributed communication mode using an uncorrelated time sequence that does not interfere with a time division multiple access network. Differentiation between the centralized mode and the distributed mode is accomplished by assessing whether a locomotive and control unit is within a rail yard's infrastructure. Moreover, reliability is assured using a coordination server that dynamically routes packets between multiple satellite RCL repeaters based on received signal strength. Lastly, the present invention further contemplates the use of an out-of-band transmission to upgrade and test operator control units, thereby allowing for field maintenance and software upgrades.
1. A system for remote control of locomotives, comprising:
a single time division multiple access network;
at least one locomotive equipped so as to be operatively controlled by a locomotive control unit suitable for transmitting and receiving information via the network;
at least two operator control units suitable for transmitting and receiving information via the network; and
said network employing both spatial and frequency diversity for remote control, wherein the network comprises a centralized coordination mode comprising a repeater infrastructure along with a distributed coordination mode wherein the locomotive control unit communicates directly with the operator control units, wherein the repeater infrastructure communicates coverage area and defines periods of time for communication by the at least one locomotive control unit and the at least two operator control units;
wherein the at least one locomotive control unit and the at least two operator control units use the centralized coordination mode simultaneously with the distributed coordination mode; and
wherein the locomotive control unit and operator control unit device will only transmit in a respective defined period of time.
2. The system of claim 1 , wherein at least one operator control unit is mobile.
3. The system of claim 1 , further comprising an inter-access point protocol for an off-channel backhaul link, where the message is stored, to control the communication with the repeater coordination server.
4. The system of claim 1 , wherein the operator control unit comprises:
a controller;
a radio having an antenna;
a display;
a brake lever;
a throttle lever; and
wherein said controller generates signals that are transmitted, via the radio, to the locomotive control unit.
5. The system of claim 1 , wherein
the distributed communication mode uses an uncorrelated time sequence that does not interfere with said time division multiple access network.
6. The system of claim 1 , wherein the repeater infrastructure comprises a plurality of repeaters and a repeater coordination server to coordinate the communications of the plurality of repeaters and to optimize a communication path between any locomotive control unit and any operator control unit.
7. The system of claim 6 , wherein the at least one repeater calculates a received signal strength indication for each signal the at least one repeater receives from a locomotive control unit and an operator control unit and sends the signal and the received signal strength indication to the repeater coordination server, and wherein the communication path is optimized by selecting the repeater with the largest received signal strength indication for each of the locomotive control unit and the operator control unit to transmit messages bound for the respective unit.