US3889266A
Expired / Lapsed
US
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Multiple correlation method and apparatus for measuring and summing time differences
Assignee: Dewey Electronics Corp
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Filing: 1959-01-22
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Granted: 1975-06-10
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Expires: 1979-01-22
Abstract
Abstract 15. Apparatus for determining the distance between a radio transmitting system and a radio receiving system, said receiving system including five receiving stations, one of said stations being situated at the center of a circle and the remaining four being equally spaced around the periphery of said circle whereby the signals are received with different time delays, means for determining a linear combination of said time delays, means responsive to said last means for indicating said distance, and means responsive to the measured linear combination of said delay times for producing a video pulse having a time delay corresponding to said distance.
Inventors
- 👤 James F Bartram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
107 words
A method of measuring the time differences of a plurality of electrical signals comprising the steps of deriving frequency components of two of said signals, multiplying each frequency component of one of said signals by a frequency component of the other of said two signals, selecting from each product of the multiplied components a component having a frequency equal to the sum of their frequencies, subjecting a third signal to a time delay, multiplying said delayed third signal with said sum frequency components, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency component for different amounts of said time delay.
Claim 2
Independent Claim
107 words
A method of measuring the time differences of a plurality of electrical signals comprising the steps of deriving frequency components of two of said signals, multiplying each frequency component of one of said signals by a frequency component of the other of said two signals, selecting from each product of the multiplied components a component having a frequency equal to the sum of their frequencies, subjecting a third signal to a time delay, multiplying said delayed third signal with said sum frequency components, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency component for different amounts of said time delay.
Claim 3
Dependent Claim
50 words
A method according to claim 1, wherein said third signal is subjected to a plurality of time delays and each different time delayed portion of the third signal is separately multiplied with said sum frequency components simultaneously, and a zero frequency voltage is derived from each of the separate multiplications.
Claim 4
Independent Claim
109 words
A method of measuring the time differences of a plurality of electrical signals comprising the steps of deriving like frequency components of two of said signals, multiplying each frequency component of one of said two signals by the like frequency component of the other of said two signals, selecting from each product of the multiplied components the double frequency component, summing the selected double frequency components, subjecting a third signal to a time delay, multiplying said delayed third signal with said summed double frequency components, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency component for different amounts of said time delay.
Claim 5
Independent Claim
109 words
A method of measuring the time differences of a plurality of electrical signals comprising the steps of deriving like frequency components of two of said signals, multiplying each frequency component of one of said two signals by the like frequency component of the other of said two signals, selecting from each product of the multiplied components the double frequency component, summing the selected double frequency components, subjecting a third signal to a time delay, multiplying said delayed third signal with said summed double frequency components, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency component for different amounts of said time delay.
Claim 6
Independent Claim
137 words
A method of measuring the time differences of a plurality of signals comprising the steps of deriving like frequency components of a number of said signals, multiplying each frequency component of one of said signals by the like frequency component of another of said signals, selecting from each product of the multiplied components the sum frequency component, multiplying the sum frequency components together and again selecting the sum frequency resulting from the multiplication, summing the last selected frequency components, similarly multiplying the remainder of said plurality of signals and similarly selecting the products of the multiplications, subjecting last-mentioned multiplied signals to a time delay, multiplying said delayed signals with said summed frequency components, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency component for different amounts of said time delay.
Claim 7
Independent Claim
137 words
A method of measuring the time differences of a plurality of signals comprising the steps of deriving like frequency components of a number of said signals, multiplying each frequency component of one of said signals by the like frequency component of another of said signals, selecting from each product of the multiplied components the sum frequency component, multiplying the sum frequency components together and again selecting the sum frequency resulting from the multiplication, summing the last selected frequency components, similarly multiplying the remainder of said plurality of signals and similarly selecting the products of the multiplications, subjecting last-mentioned multiplied signals to a time delay, multiplying said delayed signals with said summed frequency components, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency component for different amounts of said time delay.
Claim 8
Independent Claim
125 words
The method of measuring a linear combination of the delay times of a plurality of electrical signals having equal component frequencies, comprising the steps of multiplying together m signals whose delay times have one algebraic sign in said linear combination, selecting the set of multiplication products having frequencies equal to m times the component frequencies of said m signals, multiplying another signal by itself and selecting the set of multiplication products having frequencies equal to m times component frequencies of said other signal, subjecting the two sets of products to a relative time delay, multiplying together the two sets of products, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency components for different amounts of said time delay.
Claim 9
Independent Claim
125 words
The method of measuring a linear combination of the delay times of a plurality of electrical signals having equal component frequencies, comprising the steps of multiplying together m signals whose delay times have one algebraic sign in said linear combination, selecting the set of multiplication products having frequencies equal to m times the component frequencies of said m signals, multiplying another signal by itself and selecting the set of multiplication products having frequencies equal to m times component frequencies of said other signal, subjecting the two sets of products to a relative time delay, multiplying together the two sets of products, selecting the substantially zero frequency components of said last multiplication, and measuring said substantially zero frequency components for different amounts of said time delay.
Claim 10
Independent Claim
19 words
The method of measuring time differences Tau n of a plurality of electrical signals to obtain a linear combination
Claim 11
Independent Claim
19 words
The method of measuring time differences Tau n of a plurality of electrical signals to obtain a linear combination
Claim 12
Independent Claim
22 words
The methOd of measuring a plurality of electrical signals to obtain a linear combination of their time differences Tau n defined by
Claim 13
Independent Claim
22 words
The methOd of measuring a plurality of electrical signals to obtain a linear combination of their time differences Tau n defined by
Claim 14
Dependent Claim
42 words
The method according to claim 5 for determining the position of a radio transmitting station, comprising the additional steps of deriving from the transmitted signals at at least three spaced receiving stations, said plurality of electrical signals having time differences Tau n.
Claim 15
Dependent Claim
44 words
The method according to claim 8, wherein the step of receiving said signals comprises receiving five signals at five receiving stations one of which is at the center of a circle and the other four are equally spaced on the periphery of the circle.
Claim 16
Dependent Claim
40 words
The method according to claim 8 comprising the step of sequentially sensing said plurality of voltages and producing a signal in response to said plurality of voltages having a time delay corresponding to the distance range of said transmitting station.
Claim 17
Dependent Claim
210 words
Apparatus for obtaining a linear combination of the time delays of a plurality of continuous wave signals comprising a plurality of input terminals on each of which one of said signals is adapted to be impressed, a plurality of narrow band pass filters having different frequency bands connected to each of said terminals, a plurality of first multiplier circuits each connected to at least one of said filters, a high pass filter connected to the output of each of said multiplier circuits for selecting and passing the sum frequency of the multiplier circuits, a first summing circuit connected to the high pass filters which are connected to selected ones of said terminals, a second summing circuit connected to the high pass filters which are connected to other selected input terminals, a delay line having a plurality of outlet taps at different delay points therealong, means for impressing the output of the second summing circuit on the input of said delay line, a multiplying circuit connected to each of the taps, means connecting the first summing circuit to each of said last-mentioned multiplying circuits, a low pass filter connected to the output of each of said last-mentioned multiplying circuits and an output tap on each of said low pass filter circuits.
Claim 18
Dependent Claim
210 words
Apparatus for obtaining a linear combination of the time delays of a plurality of continuous wave signals comprising a plurality of input terminals on each of which one of said signals is adapted to be impressed, a plurality of narrow band pass filters having different frequency bands connected to each of said terminals, a plurality of first multiplier circuits each connected to at least one of said filters, a high pass filter connected to the output of each of said multiplier circuits for selecting and passing the sum frequency of the multiplier circuits, a first summing circuit connected to the high pass filters which are connected to selected ones of said terminals, a second summing circuit connected to the high pass filters which are connected to other selected input terminals, a delay line having a plurality of outlet taps at different delay points therealong, means for impressing the output of the second summing circuit on the input of said delay line, a multiplying circuit connected to each of the taps, means connecting the first summing circuit to each of said last-mentioned multiplying circuits, a low pass filter connected to the output of each of said last-mentioned multiplying circuits and an output tap on each of said low pass filter circuits.
Claim 19
Dependent Claim
28 words
Apparatus according to claim 11, wherein each of said first multipliers has connections to a pair of input terminals through a pair of said narrow band pass filters.
Claim 20
Dependent Claim
15 words
Apparatus according to claim 11 including means for sensing the voltages of said output taps.
Claim 21
Dependent Claim
54 words
Apparatus according to claim 13 wherein said last-named means includes gating circuits connected to each of said taps, means for opening said gating circuits sequentially and producing a video pulse having a timing corresponding to the voltage distribution on said taps, and an indicator connected to said gating circuits for displaying said video pulse.
Claim 22
Dependent Claim
101 words
Apparatus for determining tHe distance between a radio transmitting system and a radio receiving system, said receiving system including five receiving stations, one of said stations being situated at the center of a circle and the remaining four being equally spaced around the periphery of said circle whereby the signals are received with different time delays, means for determining a linear combination of said time delays, means responsive to said last means for indicating said distance, and means responsive to the measured linear combination of said delay times for producing a video pulse having a time delay corresponding to said distance.
Claim 23
Dependent Claim
101 words
Apparatus for determining tHe distance between a radio transmitting system and a radio receiving system, said receiving system including five receiving stations, one of said stations being situated at the center of a circle and the remaining four being equally spaced around the periphery of said circle whereby the signals are received with different time delays, means for determining a linear combination of said time delays, means responsive to said last means for indicating said distance, and means responsive to the measured linear combination of said delay times for producing a video pulse having a time delay corresponding to said distance.
Claim 24
Dependent Claim
45 words
The apparatus according to claim 15, wherein said means for determining the linear combination of delay times is arranged to compute the average of the four arrival times of the signals at the four peripheral stations relative to the arrival time at the center station.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |