# US 7,466,266 B2 · Psuedo television transmitters for position location

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- Number: US 7,466,266 B2
- Document ID: US7466266B2
- Status: Granted
- Kind: B2
- Application number: 11/425,932
- Filed: 2006-06-22
- Published: 2007-12-27
- Granted: 2008-12-16
- Earliest claimed: 2006-06-22
- Assignees: Rosum Corporation
- Inventors: Guttorm Opshaug
- Web page: https://patentgrep.com/patent/US7466266B2

## CPC

- G01S 5/021: {Calibration, monitoring or correction (G01S5/0252 takes precedence)}
- G01S 19/46: the supplementary measurement being of a radio-wave signal type
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 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.

### Claim 8 (depends on 7)

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.

### Claim 9 (depends on 7)

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.

### Claim 10 (depends on 9)

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.

### Claim 11 (depends on 7)

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.

### Claim 12 (depends on 7)

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.

### Claim 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.

### Claim 14 (depends on 13)

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.

### Claim 15 (depends on 14)

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.

### Claim 16 (depends on 13)

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.

### Claim 17 (depends on 13)

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.

### Claim 18 (depends on 13)

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.

### Claim 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.

### Claim 20 (depends on 19)

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.

### Claim 21 (depends on 19)

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.

### Claim 22 (depends on 21)

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.

### Claim 23 (depends on 19)

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.

### Claim 24 (depends on 19)

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.

### Claim 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.

### Claim 26 (depends on 25)

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.

### Claim 27 (depends on 26)

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.

### Claim 28 (depends on 25)

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.

### Claim 29 (depends on 25)

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.

### Claim 30 (depends on 25)

The method of claim 25, wherein generating a self-test output further comprises:
determining the range, wherein the self-test output represents the range.

### Claim 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.

### Claim 32 (depends on 31)

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.

### Claim 33 (depends on 31)

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.

### Claim 34 (depends on 33)

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.

### Claim 35 (depends on 31)

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.

### Claim 36 (depends on 31)

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.