Position location using digital audio broadcast signals
View Patent ↗A method, apparatus, and computer-readable media for determining the position of a user terminal comprises receiving, at the user terminal, a digital audio broadcast signal; and determining a pseudo-range between the user terminal and a transmitter of the digital audio broadcast signal based on a known component of the digital audio broadcast signal; wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
1. An apparatus for determining the position of a user terminal, comprising:
a receiver adapted to receive, at the user terminal, a digital audio broadcast signal; and
a pseudo-range unit adapted to determine a pseudo-range between the user terminal and a transmitter of the digital audio broadcast signal based on a known component of the digital audio broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
2. The apparatus of claim 1 , further comprising:
a processor adapted to determine the position of the user terminal based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
3. The apparatus of claim 1 , wherein the digital audio broadcast signal is selected from the group consisting of:
a European Telecommunications Standards Institute (ETSI) Digital Audio Broadcast (DAB) signal; and
an In-Band On-Channel (IBOC) audio broadcast signal.
4. The apparatus of claim 3 , wherein the known component of the digital audio broadcast signal is selected from the group consisting of:
a synchronization symbol;
a null symbol in a synchronization channel; and
a phase reference symbol in a synchronization channel.
5. The apparatus of claim 1 , further comprising:
a further receiver adapted to receive, at the user terminal, a broadcast signal; and
a further pseudo-range unit adapted to determine a pseudo-range between the user terminal and a transmitter of the broadcast signal based on a known component of the broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal, the pseudo-range between the user terminal and the transmitter of the broadcast signal, a location of the transmitter of the digital audio broadcast signal, and a location of the transmitter of the broadcast signal.
6. The apparatus of claim 5 , wherein the broadcast signal is selected from the group consisting of:
a broadcast television signal;
a mobile telephone cell site broadcast signal; and
a Global Positioning System signal.
7. An apparatus for determining the position of a user terminal, comprising:
receiver means for receiving, at the user terminal, a digital audio broadcast signal; and
pseudo-range unit means for determining a pseudo-range between the user terminal and a transmitter of the digital audio broadcast signal based on a known component of the digital audio broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
8. The apparatus of claim 7 , further comprising:
processor means for determining the position of the user terminal based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
9. The apparatus of claim 7 , wherein the digital audio broadcast signal is selected from the group consisting of:
a European Telecommunications Standards Institute (ETSI) Digital Audio Broadcast (DAB) signal; and
an In-Band On-Channel (IBOC) audio broadcast signal.
10. The apparatus of claim 9 , wherein the known component of the digital audio broadcast signal is selected from the group consisting of:
a synchronization symbol;
a null symbol in a synchronization channel; and
a phase reference symbol in a synchronization channel.
11. The apparatus of claim 7 , further comprising:
further receiver means for receiving, at the user terminal, a broadcast signal; and
further pseudo-range unit means for determining a pseudo-range between the user terminal and a transmitter of the broadcast signal based on a known component of the broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal, the pseudo-range between the user terminal and the transmitter of the broadcast signal, a location of the transmitter of the digital audio broadcast signal, and a location of the transmitter of the broadcast signal.
12. The apparatus of claim 11 , wherein the broadcast signal is selected from the group consisting of:
a broadcast television signal;
a mobile telephone cell site broadcast signal; and
a Global Positioning System signal.
13. A method for determining the position of a user terminal, comprising:
receiving, at the user terminal, a digital audio broadcast signal; and
determining a pseudo-range between the user terminal and a transmitter of the digital audio broadcast signal based on a known component of the digital audio broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
14. The method of claim 13 , further comprising:
determining the position of the user terminal based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
15. The method of claim 13 , wherein the digital audio broadcast signal is selected from the group consisting of:
a European Telecommunications Standards Institute (ETSI) Digital Audio Broadcast (DAB) signal; and
an In-Band On-Channel (IBOC) audio broadcast signal.
16. The method of claim 15 , wherein the known component of the digital audio broadcast signal is selected from the group consisting of:
a synchronization symbol;
a null symbol in a synchronization channel; and
a phase reference symbol in a synchronization channel.
17. The method of claim 13 , further comprising:
receiving, at the user terminal, a broadcast signal; and
determining a pseudo-range between the user terminal and a transmitter of the broadcast signal based on a known component of the broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal, the pseudo-range between the user terminal and the transmitter of the broadcast signal, a location of the transmitter of the digital audio broadcast signal, and a location of the transmitter of the broadcast signal.
18. The method of claim 17 , wherein the broadcast signal is selected from the group consisting of:
a broadcast television signal;
a mobile telephone cell site broadcast signal; and
a Global Positioning System signal.
19. Computer-readable media embodying instructions executable by a computer to perform a method for determining the position of a user terminal, the method comprising:
determining a pseudo-range between the user terminal and a transmitter of a digital audio broadcast signal received at the user terminal based on a known component of the digital audio broadcast signal; and
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
20. The media of claim 19 , wherein the method further comprises:
determining the position of the user terminal based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal and a location of the transmitter of the digital audio broadcast signal.
21. The media of claim 19 , wherein the digital audio broadcast signal is selected from the group consisting of:
a European Telecommunications Standards Institute (ETSI) Digital Audio Broadcast (DAB) signal; and
an In-Band On-Channel (IBOC) audio broadcast signal.
22. The media of claim 21 , wherein the known component of the digital audio broadcast signal is selected from the group consisting of:
a synchronization symbol;
a null symbol in a synchronization channel; and
a phase reference symbol in a synchronization channel.
23. The media of claim 19 , wherein the method further comprises:
determining a pseudo-range between the user terminal and a transmitter of a broadcast signal received at the user terminal based on a known component of the broadcast signal;
wherein the position of the user terminal is determined based on the pseudo-range between the user terminal and the transmitter of the digital audio broadcast signal, the pseudo-range between the user terminal and the transmitter of the broadcast signal, a location of the transmitter of the digital audio broadcast signal, and a location of the transmitter of the broadcast signal.
24. The media of claim 23 , wherein the broadcast signal is selected from the group consisting of:
a broadcast television signal;
a mobile telephone cell site broadcast signal; and
a Global Positioning System signal.