Position location and data transmission using pseudo digital television transmitters
A method, apparatus, and computer-readable media comprising generating a positioning signal comprising a first half-field and a second half-field; and transmitting the positioning signal; wherein each of the first and second half-fields comprises 313 segments; and wherein each of the segments comprises 832 chips comprising an American Television Standards Committee (ATSC) digital television (DTV) segment synchronization signal and a pseudonoise sequence.
1. An apparatus comprising:
a signal generator adapted to generate a positioning signal comprising a first half-field and a second half-field;
wherein each of the first and second half-fields comprises 313 segments; and
wherein each of the segments comprises 832 chips comprising an American Television Standards Committee (ATSC) digital television (DTV) segment synchronization signal and a pseudonoise sequence; and
a transmitter adapted to transmit the positioning signal.
2. The apparatus of claim 1 , wherein the pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the ATSC DTV field synchronization signal; and
a Global Positioning System L5 code.
3. The apparatus of claim 1 , wherein a user terminal receives the positioning signal and determines the location of the user terminal based on the positioning signal.
4. The apparatus of claim 1 , wherein the segments are generated at a segment rate, further comprising:
a modulator adapted to modulate at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a further pseudonoise sequence having a chip rate corresponding to the segment rate.
5. The apparatus of claim 1 , wherein the further pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the ATSC DTV field synchronization signal; and
a Global Positioning System L5 code.
6. The apparatus of claim 1 , wherein the half-fields are generated at a half-field rate, further comprising:
a modulator adapted to modulate at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a binary data stream having a bit rate corresponding to the half-field rate.
7. An apparatus comprising:
signal generator means for generating a positioning signal comprising a first half-field and a second half-field;
wherein each of the first and second half-fields comprises 313 segments; and
wherein each of the segments comprises 832 chips comprising an American Television Standards Committee (ATSC) digital television (DTV) segment synchronization signal and a pseudonoise sequence; and
transmitter means for transmitting the positioning signal.
8. The apparatus of claim 7 , wherein the pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the ATSC DTV field synchronization signal; and
a Global Positioning System L5 code.
9. The apparatus of claim 7 , wherein a user terminal receives the positioning signal and determines the location of the user terminal based on the positioning signal.
10. The apparatus of claim 7 , wherein the segments are generated at a segment rate, further comprising:
modulator means for modulating at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a further pseudonoise sequence having a chip rate corresponding to the segment rate.
11. The apparatus of claim 7 , wherein the further pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the ATSC DTV field synchronization signal; and
a Global Positioning System L5 code.
12. The apparatus of claim 7 , wherein the half-fields are generated at a half-field rate, further comprising:
modulator means for modulating at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a binary data stream having a bit rate corresponding to the half-field rate.
13. A method comprising:
generating a positioning signal comprising a first half-field and a second half-field; and
transmitting the positioning signal;
wherein each of the first and second half-fields comprises 313 segments; and
wherein each of the segments comprises 832 chips comprising an American Television Standards Committee (ATSC) digital television (DTV) segment synchronization signal and a pseudonoise sequence.
14. The method of claim 13 , wherein the pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the ATSC DTV field synchronization signal; and
a Global Positioning System L5 code.
15. The method of claim 13 , wherein a user terminal receives the positioning signal and determines the location of the user terminal based on the positioning signal.
16. The method of claim 13 , wherein the segments are generated at a segment rate, further comprising:
modulating at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a further pseudonoise sequence having a chip rate corresponding to the segment rate.
17. The method of claim 13 , wherein the further pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the 511-chip field synchronization signal; and
a Global Positioning System L5 code.
18. The method of claim 13 , wherein the half-fields are generated at a half-field rate, further comprising:
modulating at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a binary data stream having a bit rate corresponding to the half-field rate.
19. Computer-readable media embodying instructions executable by a computer to perform a method comprising:
generating a positioning signal comprising a first half-field and a second half-field; and
transmitting the positioning signal;
wherein each of the first and second half-fields comprises 313 segments; and
wherein each of the segments comprises 832 chips comprising an American Television Standards Committee (ATSC) digital television (DTV) segment synchronization signal and a pseudonoise sequence.
20. The media of claim 19 , wherein the pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the ATSC DTV field synchronization signal; and
a Global Positioning System L5 code.
21. The media of claim 19 , wherein a user terminal receives the positioning signal and determines the location of the user terminal based on the positioning signal.
22. The media of claim 19 , wherein the segments are generated at a segment rate, wherein the method further comprises:
modulating at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a further pseudonoise sequence having a chip rate corresponding to the segment rate.
23. The media of claim 19 , wherein the further pseudonoise sequence comprises a portion of at least one of the group consisting of:
a rotated version of the 511-chip field synchronization signal; and
a Global Positioning System L5 code.
24. The media of claim 19 , wherein the half-fields are generated at a half-field rate, wherein the method further comprises:
modulating at least one of the group consisting of the first half-fields and the second half-fields of the positioning signal using a binary data stream having a bit rate corresponding to the half-field rate.