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An apparatus having corresponding methods comprises a signal generator to generate an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; a wireless transmitter to wirelessly transmit the RF signal; and a self-check unit comprising a receiver to rec

An apparatus having corresponding methods comprises a signal generator to generate an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; a wireless transmitter to wirelessly transmit the RF signal; and a self-check unit comprising a receiver to receive the RF signal, and to recover the ranging signal from the RF signal, a pseudorange circuit to determine a pseudorange based on the ranging signal, and a self-test circuit to generate a self-test output based on the pseudorange.

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What is claimed is: 1. An apparatus comprising: a signal generator to generate an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; a wireless transmitter to wirelessly transmit the RF signal; and a self-check unit comprising a receiver to receiv

What is claimed is: 1. An apparatus comprising: a signal generator to generate an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; a wireless transmitter to wirelessly transmit the RF signal; and a self-check unit comprising a receiver to receive the RF signal, and to recover the ranging signal from the RF signal, a pseudorange circuit to determine a pseudorange based on the ranging signal, and a self-test circuit to generate a self-test output based on the pseudorange; wherein the self-test circuit comprises a wireless receiver to wirelessly receive a second RF signal comprising a second ranging signal comprising a component of a television signal, and to recover the second ranging signal from the second RF signal, and a second pseudorange circuit to determine a second pseudorange based on the second ranging signal, wherein a station comprising a transmitter of the second RF signal generates a third pseudorange based on the ranging signal and a fourth pseudorange based on the second ranging signal, wherein a range between the station and the apparatus is determined based on the pseudoranges. 2. The apparatus of claim 1, further comprising: a wireless receiver to wirelessly receive a plurality of second RF signals; and a signal processor to determine a position of the wireless transmitter based on the second RF signals; wherein the RF signal comprises a signal representing the position of the wireless transmitter. 3. The apparatus of claim 2, wherein the second RF signals comprise at least one of the group consisting of: a television signal; and a satellite positioning signal. 4. The apparatus of claim 1: wherein the signal generator generates a second RF signal comprising the ranging signal; wherein the wireless transmitter wirelessly transmits the second RF signal; wherein the receiver receives the second RF signal, and recovers the ranging signal from the second RF signal; wherein the pseudorange circuit determines a second pseudorange based on the ranging signal recovered from the second RF signal; and wherein the self-test circuit comprises a group delay circuit to determine a relative group delay between the RF signals based on the pseudoranges; and wherein the self-test output represents the relative group delay. 5. The apparatus of claim 1, wherein the self-test circuit comprises: a correlator to generate a correlation output based on the ranging signal and a reference waveform; and a comparator to generate a comparator output based on the correlation output and a correlation template; and wherein the self-test output represents the comparator output. 6. The apparatus of claim 1, wherein the self-test circuit further comprises: a range circuit to determine the range, wherein the self-test output represents the range. 7. An apparatus comprising: a signal generator to generate an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; a wireless transmitter to wirelessly transmit the RF signal; a self-check unit comprising a receiver to receive the RF signal, and to recover the ranging signal from the RF signal, a pseudorange circuit to determine a pseudorange based on the ranging signal, and a self-test circuit to generate a self-test output based on the pseudorange; and a first clock, wherein the ranging signals are generated according to the first clock; wherein the self-test circuit comprises a wireless receiver to wirelessly receive a second RF signal comprising a second ranging signal comprising a component of a television signal, wherein the second ranging signal is generated according to a second clock, and to recover the second ranging signal from the second RF signal, and a second pseudorange circuit to determine a second pseudorange based on the second ranging signal, wherein a station comprising a transmitter of the second RF signal generates a third pseudorange based on the ranging signal and a fourth pseudorange based on the second ranging signal, and wherein a clock bias between the first and second clocks is determined based on the pseudoranges. 8. The apparatus of claim 7, wherein the self-test circuit further comprises: a clock bias circuit to determine the clock bias, wherein the self-test output represents the clock bias. 9. The apparatus of claim 7, further comprising: a wireless receiver to wirelessly receive a plurality of second RF signals; and a signal processor to determine a position of the wireless transmitter based on the second RF signals; wherein the RF signal comprises a signal representing the position of the wireless transmitter. 10. The apparatus of claim 9, wherein the second RF signals comprise at least one of the group consisting of: a television signal; and a satellite positioning signal. 11. The apparatus of claim 7: wherein the signal generator generates a second RF signal comprising the ranging signal; wherein the wireless transmitter wirelessly transmits the second RF signal; wherein the receiver receives the second RF signal, and recovers the ranging signal from the second RF signal; wherein the pseudorange circuit determines a second pseudorange based on the ranging signal recovered from the second RF signal; and wherein the self-test circuit comprises a group delay circuit to determine a relative group delay between the RF signals based on the pseudoranges; and wherein the self-test output represents the relative group delay. 12. The apparatus of claim 7, wherein the self-test circuit comprises: a correlator to generate a correlation output based on the ranging signal and a reference waveform; and a comparator to generate a comparator output based on the correlation output and a correlation template; and wherein the self-test output represents the comparator output. 13. An apparatus comprising: means for generating an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; means for wirelessly transmitting the RF signal; and means for self-checking comprising means for receiving the RF signal, and for recovering the ranging signal from the RF signal, means for determining a pseudorange based on the ranging signal, and means for generating a self-test output based on the pseudorange; wherein the means for generating a self-test output comprises means for wirelessly receiving a second RF signal comprising a second ranging signal comprising a component of a television signal, and for recovering the second ranging signal from the second RF signal, and means for determining a second pseudorange based on the second ranging signal, wherein a station comprising a transmitter of the second RF signal generates a third pseudorange based on the ranging signal and a fourth pseudorange based on the second ranging signal, wherein a range between the station and the apparatus is determined based on the pseudoranges. 14. The apparatus of claim 13, further comprising: means for wirelessly receiving a plurality of second RF signals; and means for determining a position of the means for wirelessly transmitting based on the second RF signals; wherein the RF signal comprises a signal representing the position of the means for wirelessly transmitting. 15. The apparatus of claim 14, wherein the second RF signals comprise at least one of the group consisting of: a television signal; and a satellite positioning signal. 16. The apparatus of claim 13: wherein the means for generating generates a second RF signal comprising the ranging signal; wherein the means for wirelessly transmitting wirelessly transmits the second RF signal; wherein the means for receiving receives the second RF signal, and recovers the ranging signal from the second RF signal; wherein the means for determining a pseudorange determines a second pseudorange based on the ranging signal recovered from the second RF signal; and wherein the means for generating a self-test output comprises means for determining a relative group delay between the RF signals based on the pseudoranges; and wherein the self-test output represents the relative group delay. 17. The apparatus of claim 13, wherein the means for generating a self-test output comprises: means for generating a correlation output based on the ranging signal and a reference waveform; and means for generating a comparator output based on the correlation output and a correlation template; and wherein the self-test output represents the comparator output. 18. The apparatus of claim 13, wherein the means for generating a self-test output further comprises: means for determining the range, wherein the self-test output represents the range. 19. An apparatus comprising: means for generating an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; means for wirelessly transmitting the RF signal; means for self-checking comprising means for receiving the RF signal, and for recovering the ranging signal from the RF signal, means for determining a pseudorange based on the ranging signal, and means for generating a self-test output based on the pseudorange; and first means for clocking, wherein the ranging signals are generated according to the first means for clocking; wherein the means for generating a self-test output comprises means for wirelessly receiving a second RF signal comprising a second ranging signal comprising a component of a television signal, wherein the second ranging signal is generated according to a second clock, and to recover the second ranging signal from the second RF signal, and means for determining a second pseudorange based on the second ranging signal, wherein a station comprising a transmitter of the second RF signal generates a third pseudorange based on the ranging signal and a fourth pseudorange based on the second ranging signal, and wherein a clock bias between the first means for clocking and the second clock is determined based on the pseudoranges. 20. The apparatus of claim 19, wherein the means for generating a self-test output further comprises: means for determining the clock bias, wherein the self-test output represents the clock bias. 21. The apparatus of claim 19, further comprising: means for wirelessly receiving a plurality of second RF signals; and means for determining a position of the means for wirelessly transmitting based on the second RF signals; wherein the RF signal comprises a signal representing the position of the means for wirelessly transmitting. 22. The apparatus of claim 21, wherein the second RF signals comprise at least one of the group consisting of: a television signal; and a satellite positioning signal. 23. The apparatus of claim 19: wherein the means for generating generates a second RF signal comprising the ranging signal; wherein the means for wirelessly transmitting wirelessly transmits the second RF signal; wherein the means for receiving receives the second RF signal, and recovers the ranging signal from the second RF signal; wherein the means for determining a pseudorange determines a second pseudorange based on the ranging signal recovered from the second RF signal; and wherein the means for generating a self-test output comprises means for determining a relative group delay between the RF signals based on the pseudoranges; and wherein the self-test output represents the relative group delay. 24. The apparatus of claim 19, wherein the means for generating a self-test output comprises: means for generating a correlation output based on the ranging signal and a reference waveform; and means for generating a comparator output based on the correlation output and a correlation template; and wherein the self-test output represents the comparator output. 25. A method comprising: generating an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; wirelessly transmitting the RF signal; and self-checking comprising receiving the RF signal, recovering the ranging signal from the RF signal, determining a pseudorange based on the ranging signal, and generating a self-test output based on the pseudorange; wherein generating a self-test output comprises wirelessly receiving a second RF signal comprising a second ranging signal comprising a component of a television signal, recovering the second ranging signal from the second RF signal, and determining a second pseudorange based on the second ranging signal, wherein a station comprising a transmitter of the second RF signal generates a third pseudorange based on the ranging signal and a fourth pseudorange based on the second ranging signal, wherein a range from the station is determined based on the pseudoranges. 26. The method of claim 25, further comprising: wirelessly receiving a plurality of second RF signals; and determining a position based on the second RF signals; wherein the RF signal comprises a signal representing the position. 27. The method of claim 26, wherein the second RF signals comprise at least one of the group consisting of: a television signal; and a satellite positioning signal. 28. The method of claim 25, further comprising: generating a second RF signal comprising the ranging signal; wirelessly transmitting the second RF signal; receiving the second RF signal; recovering the ranging signal from the second RF signal; determining a second pseudorange based on the ranging signal recovered from the second RF signal; and wherein generating a self-test output comprises determining a relative group delay between the RF signals based on the pseudoranges; and wherein the self-test output represents the relative group delay. 29. The method of claim 25, wherein generating a self-test output comprises: generating a correlation output based on the ranging signal and a reference waveform; and generating a comparator output based on the correlation output and a correlation template; and wherein the self-test output represents the comparator output. 30. The method of claim 25, wherein generating a self-test output further comprises: determining the range, wherein the self-test output represents the range. 31. A method comprising: generating an radio-frequency (RF) signal comprising a ranging signal comprising a component of a television signal; wirelessly transmitting the RF signal; self-checking comprising receiving the RF signal, recovering the ranging signal from the RF signal, determining a pseudorange based on the ranging signal, and generating a self-test output based on the pseudorange; and generating the ranging signals according to a first clock; wherein generating a self-test output comprises wirelessly receiving a second RF signal comprising a second ranging signal comprising a component of a television signal, wherein the second ranging signal is generated according to a second clock, recovering the second ranging signal from the second RF signal, and determining a second pseudorange based on the second ranging signal, wherein a station comprising a transmitter of the second RF signal generates a third pseudorange based on the ranging signal and a fourth pseudorange based on the second ranging signal, and wherein a clock bias between the first and second clocks is determined based on the pseudoranges. 32. The method of claim 31, wherein generating the self-test output further comprises: determining the clock bias, wherein the self-test output represents the clock bias. 33. The method of claim 31, further comprising: wirelessly receiving a plurality of second RF signals; and determining a position based on the second RF signals; wherein the RF signal comprises a signal representing the position. 34. The method of claim 33, wherein the second RF signals comprise at least one of the group consisting of: a television signal; and a satellite positioning signal. 35. The method of claim 31, further comprising: generating a second RF signal comprising the ranging signal; wirelessly transmitting the second RF signal; receiving the second RF signal; recovering the ranging signal from the second RF signal; determining a second pseudorange based on the ranging signal recovered from the second RF signal; and wherein generating a self-test output comprises determining a relative group delay between the RF signals based on the pseudoranges; and wherein the self-test output represents the relative group delay. 36. The method of claim 31, wherein generating a self-test output comprises: generating a correlation output based on the ranging signal and a reference waveform; and generating a comparator output based on the correlation output and a correlation template; and wherein the self-test output represents the comparator output.