Doppler-aided positioning, navigation, and timing using broadcast television signals
First Claim
1. An apparatus comprising:
- a clock module configured to generate a clock signal;
a pseudorange measurement module configured to determine a plurality of first pseudoranges based on the clock signal and a plurality of respective wireless television signals received by an apparatus, wherein each of the first pseudoranges represents a difference between a time of transmission of the respective wireless television signal from a respective transmitter and a time of reception of the respective wireless television signal at the apparatus and a time offset of the clock signal;
a frequency offset measurement module configured to determine a plurality of first estimates of frequency offsets of the wireless television signals received by the apparatus based on the clock signal;
an estimation module configured to determine a first estimate of a location of the apparatus based on the first pseudoranges, the first frequency offsets of the wireless television signals, and locations of the transmitters; and
a receiver module configured to receive indications of times of transmission of the wireless television signals and measurements of the frequencies of the wireless television signals, wherein the measurements of the frequencies of the wireless television signals are determined at one or more monitor units receiving the wireless television signals at known locations;
wherein the pseudorange measurement module is further configured to determine the plurality of first pseudoranges based on the clock signal, the plurality of respective wireless television signals received by the apparatus, and the times of transmission of the wireless television signals;
wherein the frequency offset measurement module is further configured to determine the plurality of first estimates of the frequency offsets of the wireless television signals received by the apparatus based on the clock signal and the measurements of the frequencies of the wireless television signals; and
wherein the estimation module comprises;
a pseudorange processing module configured to determine a first interim estimate of the location of the apparatus, and a first interim estimate of the time offset of the clock signal, based on the first pseudoranges; and
a Doppler processing module configured to determine a first interim estimate of the velocity of the apparatus, and a first interim estimate of the frequency offset of the clock signal, based on the first estimates of the frequency offsets of the wireless television signals.
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Accused Products
Abstract
Methods having corresponding apparatus and tangible computer-readable media comprise: determining a plurality of first pseudoranges based on a plurality of respective wireless television signals received by an apparatus and a clock signal generated by the apparatus, wherein each of the first pseudoranges represent a difference between a time of transmission of the respective wireless television signal from a respective transmitter and a time of reception of the respective wireless television signal at the apparatus and a time offset of the clock signal; determining a plurality of first estimates of frequency offsets of the wireless television signals received by the apparatus; and determining a first estimate of a location of the apparatus based on the first pseudoranges, the first frequency offsets of the wireless television signals, and locations of the transmitters.
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Citations
18 Claims
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1. An apparatus comprising:
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a clock module configured to generate a clock signal; a pseudorange measurement module configured to determine a plurality of first pseudoranges based on the clock signal and a plurality of respective wireless television signals received by an apparatus, wherein each of the first pseudoranges represents a difference between a time of transmission of the respective wireless television signal from a respective transmitter and a time of reception of the respective wireless television signal at the apparatus and a time offset of the clock signal; a frequency offset measurement module configured to determine a plurality of first estimates of frequency offsets of the wireless television signals received by the apparatus based on the clock signal; an estimation module configured to determine a first estimate of a location of the apparatus based on the first pseudoranges, the first frequency offsets of the wireless television signals, and locations of the transmitters; and a receiver module configured to receive indications of times of transmission of the wireless television signals and measurements of the frequencies of the wireless television signals, wherein the measurements of the frequencies of the wireless television signals are determined at one or more monitor units receiving the wireless television signals at known locations; wherein the pseudorange measurement module is further configured to determine the plurality of first pseudoranges based on the clock signal, the plurality of respective wireless television signals received by the apparatus, and the times of transmission of the wireless television signals; wherein the frequency offset measurement module is further configured to determine the plurality of first estimates of the frequency offsets of the wireless television signals received by the apparatus based on the clock signal and the measurements of the frequencies of the wireless television signals; and wherein the estimation module comprises;
a pseudorange processing module configured to determine a first interim estimate of the location of the apparatus, and a first interim estimate of the time offset of the clock signal, based on the first pseudoranges; and
a Doppler processing module configured to determine a first interim estimate of the velocity of the apparatus, and a first interim estimate of the frequency offset of the clock signal, based on the first estimates of the frequency offsets of the wireless television signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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determining a plurality of first pseudoranges based on a plurality of respective wireless television signals received by an apparatus and a clock signal generated by the apparatus, wherein each of the first pseudoranges represents a difference between a time of transmission of the respective wireless television signal from a respective transmitter and a time of reception of the respective wireless television signal at the apparatus and a time offset of the clock signal, wherein determining a plurality of first pseudoranges comprises;
receiving indications of times of transmission of the wireless television signals, and receiving measurements of frequencies of the wireless television signals, wherein the measurements of the frequencies of the wireless television signals are determined at one or more monitor units receiving the wireless television signals at known locations;determining a plurality of first estimates of frequency offsets of the wireless television signals received by the apparatus, wherein the first estimates of frequency offsets are based on the clock signal and the measurements of the frequencies of the wireless television signals; and determining a first estimate of a location of the apparatus based on the first pseudoranges, the first frequency offsets of the wireless television signals, and locations of the transmitters, wherein determining a first estimate of a location comprises;
determining a first interim estimate of the location of the apparatus based on the first pseudorange, determining a first interim estimate of the time offset of the clock signal based on the first pseudorange, determining a first interim estimate of the velocity of the apparatus based on the first estimate of the frequency offset of the wireless television signal, and determining a first interim estimate of the frequency offset of the clock signal based on the first estimate of the frequency offset of the wireless television signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. Tangible computer-readable media embodying instructions executable by a computer to perform a method comprising:
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determining a plurality of first pseudoranges based on a plurality of respective wireless television signals received by an apparatus and a clock signal generated by the apparatus, wherein each of the first pseudoranges represents a difference between a time of transmission of the respective wireless television signal from a respective transmitter and a time of reception of the respective wireless television signal at the apparatus and a time offset of the clock signal, wherein determining a plurality of first pseudoranges comprises;
receiving indications of times of transmission of the wireless television signals, and receiving measurements of frequencies of the wireless television signals, wherein the measurements of the frequencies of the wireless television signals are determined at one or more monitor units receiving the wireless television signals at known locations;determining a plurality of first estimates of frequency offsets of the wireless television signals received by the apparatus, wherein the first estimates of frequency offsets are based on the clock signal and the measurements of the frequencies of the wireless television signals; and determining a first estimate of a location of the apparatus based on the first pseudoranges, the first frequency offsets of the wireless television signals, and locations of the transmitters, wherein determining a first estimate of a location comprises;
determining a first interim estimate of the location of the apparatus based on the first pseudorange, determining a first interim estimate of the time offset of the clock signal based on the first pseudorange, determining a first interim estimate of the velocity of the apparatus based on the first estimate of the frequency offset of the wireless television signal, and determining a first interim estimate of the frequency offset of the clock signal based on the first estimate of the frequency offset of the wireless television signal. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification