Reception of signals for ranging, timing, and data transfer
A device is disclosed. In one or more examples, the device may include an antenna to receive a signal encoding timing information for one or more of positioning, navigation, and timing. The signal may include a pulse group comprising a number of ranging pulses and a number of data pulses subsequent to the number of ranging pulses. Respective ones of the number of data pulses may have a phase of either a positive-going phase or a negative-going phase. Data may be encoded using the either positive-going phases or negative-going phases of the data pulses. The device may include a processor to decode the data at least partially responsive to the phases of the respective ones of the number of data pulses.
1. A device comprising:
an antenna to receive a signal encoding timing information for one or more of positioning, navigation, and timing, the signal comprising a pulse group comprising a number of ranging pulses and a number of data pulses subsequent to the number of ranging pulses, respective ones of the number of data pulses having a phase of either a positive-going phase or a negative-going phase, wherein data is encoded in data symbols correlated to sets of phases of the data pulses;
a memory to store a table that correlates the data symbols to the sets of phases of data pulses; and
a processor to:
observe phases of the respective ones of the number of data pulses;
decode respective ones of the data symbols at least partially responsive to the observed phases by comparing the observed phases to entries in the table that correlates the data symbols to the sets of phases of data pulses; and
obtain the data at least partially responsive to the decoded data symbols.
2. The device of claim 1 , wherein the processor is to decrypt the data.
3. The device of claim 1 , wherein the processor is to derive a message from the data.
4. The device of claim 3 , wherein the processor is to provide the message for presentation.
5. The device of claim 1 , wherein the processor is to update timing information of the processor at least partially responsive to the data.
6. The device of claim 5 , wherein the processor is to determine a location of the device at least partially responsive to the updated timing information.
7. The device of claim 1 , wherein the processor is to derive a message from the data and to update timing information of the processor at least partially responsive to the data.
8. The device of claim 7 , wherein the processor is to decrypt a portion of the data from which the message is derived.
9. The device of claim 1 , wherein respective ones of the number of ranging pulses have a phase of either a positive-going phase or a negative-going phase, wherein the phases of the respective ones of the number of ranging pulses of the pulse group are according to a pulse-phase signature, and wherein the processor is to validate a transmitter of a ranging signal by comparing phases of the number of ranging pulses with the pulse-phase signature of the transmitter.
10. The device of claim 1 , wherein the processor is to identify a transmitter of a ranging signal at least partially responsive to an inter-pulse interval, the inter-pulse interval being a duration of a time separation between the number of ranging pulses.
11. The device of claim 1 , wherein the processor is to:
obtain a time of transmission of the pulse group; and
adjust the time of transmission to account for a dithering interval.
12. The device of claim 11 , wherein the processor is to determine a location of the device at least partially responsive to the adjusted time of transmission.
13. The device of claim 1 , wherein the processor is to determine a location of the device at least partially responsive to the number of ranging pulses.
14. A device comprising:
an antenna to receive a signal encoding timing information for one or more of positioning, navigation, and timing, the signal comprising a pulse group comprising a number of ranging pulses and a number of data pulses, respective ones of the number of ranging pulses having a phase of either a positive-going phase or a negative-going phase, wherein the phases of the respective ones of the number of ranging pulses are encoded according to a pulse-phase signature, respective ones of the number of data pulses having a phase of either a positive-going phase or a negative-going phase, wherein data is encoded in data symbols correlated to sets of phases of the data pulses;
a memory to store a table that correlates data symbols to sets of phases of data pulses;
a processor to:
validate a transmitter of the signal based on comparing observed phases of the respective ones of the number of ranging pulses with the pulse-phase signature of the transmitter;
decode respective ones of the data symbols based on comparing observed phases of the respective ones of the number of data pulses to entries in the table that correlates the data symbols to the sets of phases of data pulses;
obtain data at least partially responsive to the decoded data symbols; and
derive a message from the data.
15. The device of claim 14 , wherein the processor is to update timing information of the processor at least partially responsive to the data.
16. The device of claim 14 , wherein the processor is to determine a location of the device at least partially responsive to the number of ranging pulses.
17. A method comprising:
receiving a signal encoding timing information for one or more of positioning, navigation, and timing, the signal comprising a pulse group comprising a number of ranging pulses and a number of data pulses, respective ones of the number of data pulses having a phase of either a positive-going phase or a negative-going phase, wherein data is encoded in data symbols correlated to sets of phases of the data pulses;
observing phases of the respective ones of the number of data pulses;
decoding respective ones of the data symbols based on comparing the observed phases to entries in a table that correlates the data symbols to the sets of phases of the data pulses; and
obtaining data at least partially responsive to the decoded data symbols.
18. The method of claim 17 , wherein respective ones of the number of ranging pulses have a phase of either a positive-going phase or a negative-going phase, the phases of the respective ones of the number of ranging pulses of the pulse group are according to a pulse-phase signature, and the method comprises validating a transmitter of a ranging signal by comparing phases of the number of ranging pulses with the pulse-phase signature of the transmitter.
19. The method of claim 17 , comprising determining a location at least partially responsive to the number of ranging pulses.