Patent US6753812B2 successfully refreshed from Google Patents.
US6753812B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-gated delay lock loop tracking of digital television signals
Assignee: Qualcomm Inc
•
Filing: 2002-07-31
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Granted: 2004-06-22
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Expires: 2022-07-31
Abstract
Abstract A computer program product, apparatus, and method for use in determining the position of a user terminal includes receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including selecting an observation interval based on the timing of the periodic component, and turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Inventors
- 👤 Matthew Rabinowitz
- 👤 James J. Spilker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:10
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20; G01C21/206; G01S; G01S5/00; G01S5/0009; G01S5/0018; G01S5/0036; G01S5/0045; G01S5/0054; G01S5/0081; G01S5/02; G01S5/0205; G01S5/021; G01S5/0221; G01S5/0226; G01S5/14; G01S5/145; H; H04; H04N; H04N21/00; H04N21/20; H04N21/25; H04N21/258; H04N21/25808; H04N21/25841; H04N21/266; H04N21/2662; H04N21/2668; H04N21/40; H04N21/41; H04N21/414; H04N21/41422; H04N21/60; H04N21/61; H04N21/615; H04N21/80; H04N21/81; H04N21/8126; A; A63; A63F; A63F2300/00; A63F2300/20; A63F2300/205; G01S19/00; G01S19/38; G01S19/39; G01S19/42; G01S19/45; G01S19/46; G01S5/0218
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
112 words
A method for use in determining the position of a user terminal, comprising: receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including selecting an observation interval based on the timing of the periodic component, and turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 2
Independent Claim
112 words
A method for use in determining the position of a user terminal, comprising: receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including selecting an observation interval based on the timing of the periodic component, and turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 3
Dependent Claim
26 words
The method of claim 1 , further comprising: determining the position of the user terminal based on the pseudo-range and the location of the DTV transmitter.
Claim 4
Dependent Claim
55 words
The method of claim 2 , wherein determining a position of the user terminal comprises: adjusting the pseudo-range based on a difference between a transmitter clock at the DTV transmitter and a known time reference; and determining the position of the user terminal based on the adjusted pseudo-range and the location of the DTV transmitter.
Claim 5
Dependent Claim
35 words
The method of claim 1 , wherein the DTV broadcast signal is an American Television Standards Committee (ATSC) DTV signal, and the pseudo-range is determined based on a known digital sequence in the ATSC frame.
Claim 6
Dependent Claim
15 words
The method of claim 4 , wherein the known digital sequence is a synchronization code.
Claim 7
Dependent Claim
20 words
The method of claim 5 , wherein the synchronization code is a Field Synchronization Segment within an ATSC data frame.
Claim 8
Dependent Claim
23 words
The method of claim 5 , wherein the synchronization code is a Synchronization Segment within a Data Segment within an ATSC data frame.
Claim 9
Dependent Claim
53 words
The method of claim 1 , wherein determining a position of the user terminal comprises: determining an offset between a local time reference in the user terminal and a master time reference; and determining the position of the user terminal based on the pseudo-range, the location of the DTV transmitter, and the offset.
Claim 10
Dependent Claim
33 words
The method of claim 1 , wherein determining a pseudo-range comprises: correlating the DTV signal with a signal generated by the user terminal as the DTV signal is received to produce the pseudo-range.
Claim 11
Dependent Claim
38 words
The method of claim 1 , further comprising: tracking the pilot signal of the DTV signal using a phase-lock loop; and wherein tracking the component of the DTV signal is based on the tracking of the pilot signal.
Claim 12
Dependent Claim
35 words
The method of claim 1 , further comprising: transmitting the pseudo-range to a location server configured to determine a position of the user terminal based on the pseudo-range and a location of the DTV transmitter.
Claim 13
Dependent Claim
61 words
The method of claim 1 , wherein the position of the user terminal is determined by adjusting the pseudorange based on a difference between a transmitter clock at the transmitter of the broadcast analog television signal and a known time reference, and determining the position of the user terminal based on the adjusted pseudorange and the location of the TV transmitter.
Claim 14
Dependent Claim
44 words
The method of claim 1 , further comprising: determining a further pseudorange based on a further DTV signal; and projecting the pseudorange and the further pseudorange to an instant of time, thereby eliminating any first order term in the clock of the user terminal.
Claim 15
Dependent Claim
124 words
Computer-readable media embodying instructions executable by a computer to perform a method for use in determining the position of a user terminal, the method comprising: receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including selecting an observation interval based on the timing of the periodic component, and turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 16
Dependent Claim
124 words
Computer-readable media embodying instructions executable by a computer to perform a method for use in determining the position of a user terminal, the method comprising: receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including selecting an observation interval based on the timing of the periodic component, and turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 17
Dependent Claim
29 words
The media of claim 14 , wherein the method further comprises: determining the position of the user terminal based on the pseudo-range and the location of the DTV transmitter.
Claim 18
Dependent Claim
55 words
The media of claim 15 , wherein determining a position of the user terminal comprises: adjusting the pseudo-range based on a difference between a transmitter clock at the DTV transmitter and a known time reference; and determining the position of the user terminal based on the adjusted pseudo-range and the location of the DTV transmitter.
Claim 19
Dependent Claim
35 words
The media of claim 14 , wherein the DTV broadcast signal is an American Television Standards Committee (ATSC) DTV signal, and the pseudo-range is determined based on a known digital sequence in the ATSC frame.
Claim 20
Dependent Claim
15 words
The media of claim 17 , wherein the known digital sequence is a synchronization code.
Claim 21
Dependent Claim
20 words
The media of claim 18 , wherein the synchronization code is a Field Synchronization Segment within an ATSC data frame.
Claim 22
Dependent Claim
23 words
The media of claim 18 , wherein the synchronization code is a Synchronization Segment within a Data Segment within an ATSC data frame.
Claim 23
Dependent Claim
53 words
The media of claim 14 , wherein determining a position of the user terminal comprises: determining an offset between a local time reference in the user terminal and a master time reference; and determining the position of the user terminal based on the pseudo-range, the location of the DTV transmitter, and the offset.
Claim 24
Dependent Claim
33 words
The media of claim 14 , wherein determining a pseudo-range comprises: correlating the DTV signal with a signal generated by the user terminal as the DTV signal is received to produce the pseudo-range.
Claim 25
Dependent Claim
41 words
The media of claim 14 , wherein the method further comprises: tracking the pilot signal of the DTV signal using a phase-lock loop; and wherein tracking the component of the DTV signal is based on the tracking of the pilot signal.
Claim 26
Dependent Claim
38 words
The media of claim 14 , wherein the method further comprises: transmitting the pseudo-range to a location server configured to determine a position of the user terminal based on the pseudo-range and a location of the DTV transmitter.
Claim 27
Dependent Claim
61 words
The media of claim 14 , wherein the position of the user terminal is determined by adjusting the pseudorange based on a difference between a transmitter clock at the transmitter of the broadcast analog television signal and a known time reference, and determining the position of the user terminal based on the adjusted pseudorange and the location of the TV transmitter.
Claim 28
Dependent Claim
47 words
The media of claim 14 , wherein the method further comprises: determining a further pseudorange based on a further DTV signal; and projecting the pseudorange and the further pseudorange to an instant of time, thereby eliminating any first order term in the clock of the user terminal.
Claim 29
Independent Claim
122 words
An apparatus for use in determining the position of a user terminal, comprising: means for receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; means for tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including means for selecting an observation interval based on the timing of the periodic component, and means for turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and means for determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 30
Independent Claim
122 words
An apparatus for use in determining the position of a user terminal, comprising: means for receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; means for tracking a periodic component of the DTV signal using a delay-lock loop (DLL), including means for selecting an observation interval based on the timing of the periodic component, and means for turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and means for determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 31
Dependent Claim
28 words
The apparatus of claim 27 , further comprising: means for determining the position of the user terminal based on the pseudo-range and the location of the DTV transmitter.
Claim 32
Dependent Claim
61 words
The apparatus of claim 28 , wherein means for determining a position of the user terminal comprises: means for adjusting the pseudo-range based on a difference between a transmitter clock at the DTV transmitter and a known time reference; and means for determining the position of the user terminal based on the adjusted pseudo-range and the location of the DTV transmitter.
Claim 33
Dependent Claim
35 words
The apparatus of claim 27 , wherein the DTV broadcast signal is an American Television Standards Committee (ATSC) DTV signal, and the pseudo-range is determined based on a known digital sequence in the ATSC frame.
Claim 34
Dependent Claim
15 words
The apparatus of claim 30 , wherein the known digital sequence is a synchronization code.
Claim 35
Dependent Claim
20 words
The apparatus of claim 31 , wherein the synchronization code is a Field Synchronization Segment within an ATSC data frame.
Claim 36
Dependent Claim
23 words
The apparatus of claim 31 , wherein the synchronization code is a Synchronization Segment within a Data Segment within an ATSC data frame.
Claim 37
Dependent Claim
59 words
The apparatus of claim 27 , wherein means for determining a position of the user terminal comprises: means for determining an offset between a local time reference in the user terminal and a master time reference; and means for determining the position of the user terminal based on the pseudo-range, the location of the DTV transmitter, and the offset.
Claim 38
Dependent Claim
37 words
The apparatus of claim 27 , wherein means for determining a pseudo-range comprises: means for correlating the DTV signal with a signal generated by the user terminal as the DTV signal is received to produce the pseudo-range.
Claim 39
Dependent Claim
42 words
The apparatus of claim 27 , further comprising: means for tracking the pilot signal of the DTV signal using a phase-lock loop; and wherein means for tracking the component of the DTV signal is based on the tracking of the pilot signal.
Claim 40
Dependent Claim
37 words
The apparatus of claim 27 , further comprising: means for transmitting the pseudo-range to a location server configured to determine a position of the user terminal based on the pseudo-range and a location of the DTV transmitter.
Claim 41
Dependent Claim
61 words
The apparatus of claim 27 , wherein the position of the user terminal is determined by adjusting the pseudorange based on a difference between a transmitter clock at the transmitter of the broadcast analog television signal and a known time reference, and determining the position of the user terminal based on the adjusted pseudorange and the location of the TV transmitter.
Claim 42
Dependent Claim
48 words
The apparatus of claim 27 , further comprising: means for determining a further pseudorange based on a further DTV signal; and means for projecting the pseudorange and the further pseudorange to an instant of time, thereby eliminating any first order term in the clock of the user terminal.
Claim 43
Independent Claim
124 words
An apparatus for use in determining the position of a user terminal, comprising: an antenna to receive at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; a receiver to track a periodic component of the DTV signal using a delay-lock loop (DLL), including a controller to select an observation interval based on the timing of the periodic component, and turn on a portion of the DLL during the observation interval, and turn the portion off otherwise; and a processor to determine a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 44
Independent Claim
124 words
An apparatus for use in determining the position of a user terminal, comprising: an antenna to receive at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; a receiver to track a periodic component of the DTV signal using a delay-lock loop (DLL), including a controller to select an observation interval based on the timing of the periodic component, and turn on a portion of the DLL during the observation interval, and turn the portion off otherwise; and a processor to determine a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
Claim 45
Dependent Claim
27 words
The apparatus of claim 40 , wherein the processor determines the position of the user terminal based on the pseudo-range and the location of the DTV transmitter.
Claim 46
Dependent Claim
49 words
The apparatus of claim 41 , wherein the processor: adjusts the pseudo-range based on a difference between a transmitter clock at the DTV transmitter and a known time reference; and determines the position of the user terminal based on the adjusted pseudo-range and the location of the DTV transmitter.
Claim 47
Dependent Claim
35 words
The apparatus of claim 40 , wherein the DTV broadcast signal is an American Television Standards Committee (ATSC) DTV signal, and the pseudo-range is determined based on a known digital sequence in the ATSC frame.
Claim 48
Dependent Claim
15 words
The apparatus of claim 43 , wherein the known digital sequence is a synchronization code.
Claim 49
Dependent Claim
20 words
The apparatus of claim 44 , wherein the synchronization code is a Field Synchronization Segment within an ATSC data frame.
Claim 50
Dependent Claim
23 words
The apparatus of claim 44 , wherein the synchronization code is a Synchronization Segment within a Data Segment within an ATSC data frame.
Claim 51
Dependent Claim
47 words
The apparatus of claim 40 , wherein the processor: determines an offset between a local time reference in the user terminal and a master time reference; and determines the position of the user terminal based on the pseudo-range, the location of the DTV transmitter, and the offset.
Claim 52
Dependent Claim
31 words
The apparatus of claim 40 , wherein the processor correlates the DTV signal with a signal generated by the user terminal as the DTV signal is received to produce the pseudo-range.
Claim 53
Dependent Claim
38 words
The apparatus of claim 40 , further comprising: a phase-lock loop to track the pilot signal of the DTV signal; and wherein tracking the component of the DTV signal is based on the tracking of the pilot signal.
Claim 54
Dependent Claim
38 words
The apparatus of claim 40 , further comprising: a transmitter to transmit the pseudo-range to a location server configured to determine a position of the user terminal based on the pseudo-range and a location of the DTV transmitter.
Claim 55
Dependent Claim
61 words
The apparatus of claim 40 , wherein the position of the user terminal is determined by adjusting the pseudorange based on a difference between a transmitter clock at the transmitter of the broadcast analog television signal and a known time reference, and determining the position of the user terminal based on the adjusted pseudorange and the location of the TV transmitter.
Claim 56
Dependent Claim
45 words
The apparatus of claim 40 , wherein the processor: determines a further pseudorange based on a further DTV signal; and projects the pseudorange and the further pseudorange to an instant of time, thereby eliminating any first order term in the clock of the user terminal.
References Cited (Backward Citations)
US4894662A
Cited
US4555707A
Cited
US5045861A
Cited
US5157686A
Cited
US5166952A
Cited
US5481316A
Cited
US5398034A
Cited
US5510801A
Cited
US6317500B1
Cited
US6094168A
Cited
US5774829A
Cited
US5952958A
Cited
US6078284A
Cited
US5920284A
Cited
US6107959A
Cited
US6373432B1
Cited
US6137441A
Cited
US6374177B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-06-22 | 2007-12-22 | 2008-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-06-22 | 2011-12-22 | 2012-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-06-22 | 2015-12-22 | 2016-06-22 | $7700.00 | Window Closed / Lapsed |