Emergency communications channel systems and methods for satellite command
View Patent ↗Systems and methods for commanding a satellite are provided. A system for commanding a satellite includes a data bus and a payload coupled to the data bus, the payload including a payload receiver. The system further includes a primary receiver coupled to the data bus and a processor coupled to the data bus. The processor configured to receive a first command from the primary receiver via the data bus, and to receive telemetry data from the payload via the data bus. The processor is further configured to detect a second command by processing the telemetry data received from the payload, and to execute the detected second command.
1. A system for commanding a satellite, comprising:
a data bus;
a payload coupled to the data bus, the payload comprising a payload receiver;
a primary receiver coupled to the data bus;
a processor coupled to the data bus, the processor configured to:
receive a first command from the primary receiver via the data bus;
receive telemetry data from the payload via the data bus;
detect a second command by processing the telemetry data received from the payload; and
execute the detected second command.
2. The system of claim 1 , wherein:
the processor is configured to detect an absence of commands from the primary receiver; and
the processor detects the second command in response to detecting the absence of commands from the primary receiver.
3. The system of claim 2 , wherein the absence of commands from the primary receiver comprises an absence of commands from the primary receiver for a predetermined amount of time.
4. The system of claim 3 , wherein the predetermined amount of time is configurable.
5. The system of claim 1 , wherein processing the telemetry data to detect the second command comprises detecting changes in a parameter of the telemetry data received from the payload and interpreting detected changes as data bits.
6. The system of claim 1 , wherein detecting the second command comprises detecting changes in the amount of power drawn by the payload.
7. The system of claim 1 , wherein:
the second command comprises a plurality of data bits, each of the plurality of data bits corresponding to a distinct state of a parameter of the telemetry data, and
detecting the second command comprises detecting each of the plurality of data bits associated with the second command, the detecting each of the plurality of data bits comprising:
detecting a first bit value in response to detecting a first state of the parameter of the telemetry data followed by detecting a different state of the parameter of the telemetry data corresponding to an idle state, and
detecting a second bit value in response to detecting a second state of the parameter of the telemetry data followed by detecting the different state of the parameter of the telemetry data corresponding to the idle state.
8. The system of claim 1 , wherein:
the second command comprises a plurality of symbols, each of the plurality of symbols corresponding to a distinct state of a parameter of the telemetry data, and
detecting the second command comprises detecting each of the plurality of symbols corresponding to the second command, the detecting each of the plurality of symbols comprising:
detecting the distinct state of the parameter of the telemetry data corresponding to the each of the plurality of symbols, followed by detecting a different state of the parameter of the telemetry data corresponding to an idle state.
9. The system of claim 1 , wherein detecting the second command comprises a signaling process that is substantially independent of time.
10. The system of claim 1 , wherein the processor is further configured to acknowledge the execution of the detected second command by muting a payload transponder for a predetermined amount of time.
11. The system of claim 10 , wherein the predetermined amount of time is configurable.
12. The system of claim 1 , wherein:
the payload is coupled to the data bus by a remote interface unit,
the remote interface unit is configured to collect the telemetry data from the payload and provide the telemetry data to the processor, and
the remote interface unit is configured to receive commands from the processor and send the commands to the payload via a unidirectional link.
13. The system of claim 1 , wherein:
the first command comprises:
a first portion of the first command which is in a first format,
a second portion of the first command which is in the first format,
the second command comprises:
a first portion of the second command which is in the first format
a second portion of the second command which is in a second format different from the first format, and
executing the second command comprises:
detecting the first portion of the second command within the second command, and
executing the first portion the second command.
14. The system of claim 1 , wherein detecting the second command comprises:
detecting a predetermined preamble comprising a plurality of bits, and
detecting the second command based on the detected preamble.
15. A method for commanding a satellite, the method comprising:
receiving, with a processor, a first command from a primary receiver via a data bus;
receiving, by the processor, telemetry data from a payload via the data bus;
detecting, by the processor, a second command by processing the telemetry data received from the payload; and
executing, by the processor, the detected second command.
16. The method of claim 15 , further comprising detecting, by the processor, an absence of commands from the primary receiver, wherein the second command is detected, by the processor, in response to the detecting the absence of commands from the primary receiver.
17. The method of claim 15 , wherein processing the telemetry data, by the processor, to detect the second command comprises detecting changes in a parameter of the telemetry data received from the payload and interpreting detected changes as data bits.
18. The method of claim 15 , wherein detecting the second command, by the processor, comprises detecting changes in the amount of power drawn by the payload.
19. The method of claim 15 , wherein:
the second command comprises a plurality of data bits, each of the plurality of data bits corresponding to a distinct state of a parameter of the telemetry data, and
detecting the second command, by the processor, comprises detecting each of the plurality of data bits associated with the second command, the detecting each of the plurality of data bits comprising:
detecting a first bit value in response to detecting a first state of the parameter of the telemetry data followed by detecting a different state of the parameter of the telemetry data corresponding to an idle state, and
detecting a second bit value in response to detecting a second state of the parameter of the telemetry data followed by detecting the different state of the parameter of the telemetry data corresponding to the idle state.
20. The method of claim 15 , wherein:
the second command comprises a plurality of symbols, each of the plurality of symbols corresponding to a distinct state of a parameter of the telemetry data, and
detecting the second command comprises detecting, by the processor, each of the plurality of symbols corresponding to the second command, the detecting each of the plurality of symbols comprising:
detecting the distinct state of the parameter of the telemetry data corresponding to the each of the plurality of symbols, followed by detecting a different state of the parameter of the telemetry data corresponding to an idle state.
21. The method of claim 15 , wherein:
the payload is coupled to the data bus by a remote interface unit,
the remote interface unit is configured to collect the telemetry data from the payload and provide the telemetry data to the processor, and
the remote interface unit is configured to receive commands from the processor and send the commands to the payload via a unidirectional link.
22. The method of claim 15 , wherein:
the first command comprises:
a first portion of the first command which is in a first format,
a second portion of the first command which is in the first format, and
the second command comprises:
a first portion of the second command which is in the first format
a second portion of the second command which is in a second format different from the first format, and
executing the second command, by the processor, comprises:
detecting the first portion of the second command within the second command, and
executing the first portion the second command.
23. A non-transitory computer readable medium comprising computer executable instructions, which when executed by a processor cause the processor to carry out a method for commanding a satellite comprising:
receiving, by the processor, a first command from a primary receiver via a data bus;
receiving, by the processor, telemetry data from a payload via the data bus;
detecting, by the processor, a second command by processing the telemetry data received from the payload; and
executing, by the processor, the detected second command.
24. The non-transitory computer readable medium of claim 23 , wherein the non-transitory computer readable medium comprises instructions, which when executed cause the processor to detect an absence of commands from the primary receiver, wherein the second command is detected, by the processor, in response to the detecting the absence of commands from the primary receiver.
25. The non-transitory computer readable medium of claim 23 , wherein processing the telemetry data to detect the second command comprises detecting, by the processor, changes in a parameter of the telemetry data received from the payload and interpreting detected changes as data bits.
26. The non-transitory computer readable medium of claim 23 , wherein detecting the second command comprises detecting, by the processor, changes in the amount of power drawn by the payload.
27. The non-transitory computer readable medium of claim 23 , wherein:
the second command comprises a plurality of data bits, each of the plurality of data bits corresponding to a distinct state of a parameter of the telemetry data, and
detecting, by the processor, the second command comprises detecting each of the plurality of data bits associated with the second command, the detecting each of the plurality of data bits comprising:
detecting a first bit value in response to detecting a first state of the parameter of the telemetry data followed by detecting a different state of the parameter of the telemetry data corresponding to an idle state, and
detecting a second bit value in response to detecting a second state of the parameter of the telemetry data followed by detecting the different state of the parameter of the telemetry data corresponding to the idle state.
28. The non-transitory computer readable medium of claim 23 , wherein:
the second command comprises a plurality of symbols, each of the plurality of symbols corresponding to a distinct state of a parameter of the telemetry data, and
detecting, by the processor, the second command comprises detecting each of the plurality of symbols corresponding to the second command, the detecting each of the plurality of symbols comprising:
detecting the distinct state of the parameter of the telemetry data corresponding to the each of the plurality of symbols, followed by detecting a different state of the parameter of the telemetry data corresponding to an idle state.
29. The non-transitory computer readable medium of claim 23 , wherein:
the payload is coupled to the data bus by a remote interface unit,
the remote interface unit is configured to collect the telemetry data from the payload and provide the telemetry data to the processor, and
the remote interface unit is configured to receive commands from the processor and send the commands to the payload via a unidirectional link.
30. The non-transitory computer readable medium of claim 23 , wherein:
the first command comprises:
a first portion of the first command which is in a first format,
a second portion of the first command which is in the first format,
the second command comprises:
a first portion of the second command which is in the first format
a second portion of the second command which is in a second format different from the first format, and
wherein the non-transitory computer readable medium comprises computer executable instructions, which when executed by the processor, cause the processor to execute the second command by:
detecting the first portion of the second command within the second command, and
executing the first portion the second command.