US3786405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for low-frequency transmission of radiant energy
Assignee: Raytheon Co
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Filing: 1972-11-08
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Granted: 1974-01-15
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Expires: 1992-11-08
Abstract
Abstract A communication system utilizing a highly directive lowfrequency transmission of radiant energy which is generated by directing a beam of radiant energy at a first high frequency and at a second high frequency into a nonlinear transmission medium. By virtue of an interaction in the nonlinear medium between the energies at the first and the second high frequencies, a low frequency beam of radiation is produced having a directivity pattern comparable to that of the energy radiated at the high frequencies. The system is particularly useful for sonic examination of the seabed for sub-oceanic strata and buried objects such as pipes, in which case a receiving hydrophone and display are utilized to plot a graphical display of echoes reflected from the strata.
Inventors
- 👤 M Chramiec
- 👤 W Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/88; G01S15/89; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/34; G10K11/341; G10K11/343; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
119 words
In combination: means for transmitting signals at a plurality of frequencies into a media providing a nonlinear interaction between a signal transmitted at a first frequency and a signal transmitted at a second frequency to provide a beam of radiant energy propagating a signal at a frequency equal to the difference between one frequency of said plurality of frequencies and a second frequency of said plurality of frequencies, having a common radiating aperture for the transmission of said signals at said plurality of frequencies; means coupled to said transmitting means for providing a reference having a frequency equal to said difference frequency; and means responsive to said energy for correlating said signal at said difference frequency with said reference.
Claim 2
Dependent Claim
119 words
In combination: means for transmitting signals at a plurality of frequencies into a media providing a nonlinear interaction between a signal transmitted at a first frequency and a signal transmitted at a second frequency to provide a beam of radiant energy propagating a signal at a frequency equal to the difference between one frequency of said plurality of frequencies and a second frequency of said plurality of frequencies, having a common radiating aperture for the transmission of said signals at said plurality of frequencies; means coupled to said transmitting means for providing a reference having a frequency equal to said difference frequency; and means responsive to said energy for correlating said signal at said difference frequency with said reference.
Claim 3
Dependent Claim
81 words
The combination according to claim 1 wherein said correlating means comprises: means for providing said reference; means for storing said reference in a first recirculating delay means; means for storing said difference frequency signal in a second recirculating delay means such that said stored difference frequency signal processes relative to said stored reference; and means responsive to said stored reference and said stored difference frequency signal for providing a time of arrival of said difference frequency signal at its storage means.
Claim 4
Dependent Claim
76 words
The combination according to claim 1 wherein said correlating means comprises: means for sampling said reference and said difference frequency signal to provide a series of samples of said reference and said difference frequency signal; means for signaling the coincidence of a sample of one of said series with individual samples of the other of said series; and means for combining said coincidence signals to indicate a correlation of said reference and said difference fRequency signal.
Claim 5
Dependent Claim
42 words
The combination of claim 1 further comprising means for displaying the times of arrival at said correlating means of energy at said difference frequency to show the points of reflection in a media through which said energy at said difference frequency propagates.
Claim 6
Dependent Claim
23 words
The combination of claim 4 wherein said transmitting means comprises means for modulating an input signal to generate one of said transmitted signals.
Claim 7
Dependent Claim
94 words
A sonic communication system comprising: means for transmitting and means for receiving sonic energy signals transmitted into a nonlinear medium, said transmitting means providing sonic energy at a first frequency and at a second frequency, said receiving means being responsive to energy at a frequency equal to the difference of said first frequency and said second frequency; a source of signal having a frequency equal to said difference frequency; and means for combining said signal at said difference frequency with a signal at higher frequencies to provide signals for transmission by said transmitting means.
Claim 8
Dependent Claim
94 words
A sonic communication system comprising: means for transmitting and means for receiving sonic energy signals transmitted into a nonlinear medium, said transmitting means providing sonic energy at a first frequency and at a second frequency, said receiving means being responsive to energy at a frequency equal to the difference of said first frequency and said second frequency; a source of signal having a frequency equal to said difference frequency; and means for combining said signal at said difference frequency with a signal at higher frequencies to provide signals for transmission by said transmitting means.
Claim 9
Dependent Claim
137 words
A sonic communication system comprising: means for transmitting and means for receiving sonic energy signals transmitted into a nonlinear medium, said transmitting means providing sonic energy at a first frequency and at a second frequency, said receiving means being responsive to energy at a frequency equal to the difference of said first frequency and said second frequency; a source of signal having a frequency equal to said difference frequency; means for combining said signal at said difference frequency with a signal at a higher frequency to provide a sonic energy signal for transmission by said transmitting means; means for modulating said signal at said difference frequency; and means for displaying the locations of reflections of said energy at said difference frequency from points of reflection in a medium through which said energy at said difference frequency propagates.
Claim 10
Dependent Claim
137 words
A sonic communication system comprising: means for transmitting and means for receiving sonic energy signals transmitted into a nonlinear medium, said transmitting means providing sonic energy at a first frequency and at a second frequency, said receiving means being responsive to energy at a frequency equal to the difference of said first frequency and said second frequency; a source of signal having a frequency equal to said difference frequency; means for combining said signal at said difference frequency with a signal at a higher frequency to provide a sonic energy signal for transmission by said transmitting means; means for modulating said signal at said difference frequency; and means for displaying the locations of reflections of said energy at said difference frequency from points of reflection in a medium through which said energy at said difference frequency propagates.
Claim 11
Dependent Claim
81 words
The system according to claim 7 wherein said displaying means comprises: means for storing said signal of said source in a first recirculating delay means; means coupled to said receiving means for storing a received signal in a second recirculating delay means such that said received signal processes relative to said stored signal of said source; and means responsive to said stored received signal and said stored signal of said source for providing a time of reception of said received signal.
Claim 12
Dependent Claim
59 words
A signal source propagating a radiant energy signal through a medium remote from said signal source, said signal having a spectral bandwidth equal to substantially twice the center frequency of said bandwidth, said source including a common radiator of radiant energy at two frequencies, a frequency of said signal being equal to an arithmetic combination of said two frequencies.
Claim 13
Dependent Claim
59 words
A signal source propagating a radiant energy signal through a medium remote from said signal source, said signal having a spectral bandwidth equal to substantially twice the center frequency of said bandwidth, said source including a common radiator of radiant energy at two frequencies, a frequency of said signal being equal to an arithmetic combination of said two frequencies.
Claim 14
Dependent Claim
99 words
In combination: means for transmitting signals at a plurality of frequencies into an extended medium having a nonlinear propagation characteristic and which converts at least a portion of said signals into a signal having at least one frequency which is different than said transmitted frequencies, said transmitting means including a common radiating aperture for radiation of said signals at said plurality of frequencies; means coupled to said transmitting means for generating a reference having said one frequency; means coupled to said medium for receiving said different frequency signal; and means for comparing a reference to said different frequency signal.
Claim 15
Dependent Claim
99 words
In combination: means for transmitting signals at a plurality of frequencies into an extended medium having a nonlinear propagation characteristic and which converts at least a portion of said signals into a signal having at least one frequency which is different than said transmitted frequencies, said transmitting means including a common radiating aperture for radiation of said signals at said plurality of frequencies; means coupled to said transmitting means for generating a reference having said one frequency; means coupled to said medium for receiving said different frequency signal; and means for comparing a reference to said different frequency signal.
Claim 16
Dependent Claim
15 words
The combination of claim 10 wherein said transmitting means includes means for modulating said signals.
Claim 17
Dependent Claim
76 words
The combination according to claim 10 wherein said comparing means comprises: means for sampling said reference and said different frequency signal to provide a series of samples of said reference and said different frequency signal; means for signaling the coincidence of a sample of one of said Series with individual samples of the other of said series; and means for combining said coincidence signals to indicate a correlation of said reference and said different frequency signal.
Claim 18
Dependent Claim
87 words
The combination according to claim 10 wherein said comparing means comprises: means for providing said reference, said reference having a frequency equal to said different frequency; means for storing said reference in a first recirculating delay means; means for storing said different frequency signal in a second recirculating delay means such that said stored different frequency signal processes relative to said stored reference; and means responsive to said stored reference and said stored different frequency signal for providing a time of reception of said different frequency signal.
Claim 19
Independent Claim
93 words
A system for communicating with a submerged reflector comprising in combination: means for propagating first signals through a first medium having a nonlinear propagation characteristic for converting said first signals into at least one other signal; and means for reflecting signals, said reflecting means being located within a second medium coupled to said first medium and having a relatively large transmissivity of said other signal and a relatively low transmissivity of said first signals to enable said reflecting means to selectively reflect said other signal while inhibiting the reflection of said first signals.
Claim 20
Independent Claim
93 words
A system for communicating with a submerged reflector comprising in combination: means for propagating first signals through a first medium having a nonlinear propagation characteristic for converting said first signals into at least one other signal; and means for reflecting signals, said reflecting means being located within a second medium coupled to said first medium and having a relatively large transmissivity of said other signal and a relatively low transmissivity of said first signals to enable said reflecting means to selectively reflect said other signal while inhibiting the reflection of said first signals.
Claim 21
Dependent Claim
74 words
The combination according to claim 14 further comprising: means for providing a series of samples of a reference; means for sampling said other signal to provide a series of samples of said other signal; means for signaling the coincidence of a sample of one of said series with individual samples of the other of said series; and means for combining said coincidence signals to indicate a correlation of said reference and said other signal.
Claim 22
Dependent Claim
149 words
In combination: means for transmitting at least one directive beam of radiant energy having a plurality of frequencies into a medium having a nonlinear characteristic which converts at least a portion of such radiant energy into radiant energy at a frequency lower than the frequencies of said plurality of frequencies, said transmitting means having a common radiating aperture for the radiation of said radiant energy at said plurality of frequencies; means for transporting said transmitting means through said medium sequentially illuminate portions of said medium; means located at a distance from said transmitting means for providing data relative to the location of said transmitting means; and means coupled to said medium for receiving at least a portion of said lower frequency radiant energy, said receiving means having a directivity pattern which is broader at said lower frequency than the directivity pattern of said transmitting means at said transmitted frequencies.
Claim 23
Dependent Claim
149 words
In combination: means for transmitting at least one directive beam of radiant energy having a plurality of frequencies into a medium having a nonlinear characteristic which converts at least a portion of such radiant energy into radiant energy at a frequency lower than the frequencies of said plurality of frequencies, said transmitting means having a common radiating aperture for the radiation of said radiant energy at said plurality of frequencies; means for transporting said transmitting means through said medium sequentially illuminate portions of said medium; means located at a distance from said transmitting means for providing data relative to the location of said transmitting means; and means coupled to said medium for receiving at least a portion of said lower frequency radiant energy, said receiving means having a directivity pattern which is broader at said lower frequency than the directivity pattern of said transmitting means at said transmitted frequencies.
Claim 24
Dependent Claim
20 words
The combination of claim 16 wherein a portion of said lower frequency radiant energy is reflected to said receiving means.
Claim 25
Dependent Claim
38 words
The combination of claim 17 wherein said receiving means is also transported by said transporting means, said broader directivity pattern of said receiving means permitting reception of radiant energy as said transmitting beam is moved during said transportation.
Claim 26
Dependent Claim
132 words
In combination: means for transmitting energy at a plurality of frequencies into a first and a second medium, said first medium having a nonlinear charactistic which converts said energy into energy at a frequency derived from a combination of frequencies of said plurality of frequencies, said second medium containing a reflector of said derived frequency energy to permit an echo of said derived frequency energy to emanate from said reflector, said transmitting means having a common radiating aperture for the radiation of said energy at said plurality of frequencies; means located at a distance from said transmitting means for generating signals having data relative to the locatioN of said transmitting means; and means responsive to said echo and coupled to said data signal generating means for indicating the location of said reflector.
Claim 27
Dependent Claim
132 words
In combination: means for transmitting energy at a plurality of frequencies into a first and a second medium, said first medium having a nonlinear charactistic which converts said energy into energy at a frequency derived from a combination of frequencies of said plurality of frequencies, said second medium containing a reflector of said derived frequency energy to permit an echo of said derived frequency energy to emanate from said reflector, said transmitting means having a common radiating aperture for the radiation of said energy at said plurality of frequencies; means located at a distance from said transmitting means for generating signals having data relative to the locatioN of said transmitting means; and means responsive to said echo and coupled to said data signal generating means for indicating the location of said reflector.
Claim 28
Dependent Claim
56 words
The combination of claim 19 wherein said indicating means comprises: means for receiving said echo, said receiving means having a predetermined position relative to said transmitting means; and means for measuring the time of reception of said echo at said receiving means relative to the time of transmission of said energy at said plurality of frequencies.
Claim 29
Dependent Claim
35 words
The combination of claim 19 further comprising: means for transporting said transmitting means; and means for indicating the location of said transmitting means relative to a known point to provide a map of said media.
Claim 30
Dependent Claim
76 words
The combination according to claim 19 wherein said location indicating means comprises: means for providing a series of samples of a reference; means for sampling said echo to provide a series of samples of said echo; means for signaling the coincidence of a sample of one of said series with individual samples of the other of said series; and means for combining said coincidence signals to indicate the distance between said reflector and said transmitting means.
Claim 31
Dependent Claim
133 words
A submerged reflector identification system comprising in combination: means for transmitting signals at a plurality of frequencies into a medium having a reflector therein for reflecting energy of said signals, said medium having a nonlinear characteristic for converting said signals into at least one other signal having a frequency derived from a combination of frequencies of said plurality of frequencies, said transmitting means having a common radiating aperture for radiation of said signals at said plurality of frequencies; means for receiving signals at said derived frequency reflected from said reflector; means connecting with said transmitting means for providing a modulation of said derived frequency for identification of said reflector; and means coupled to said receiving means and to said modulation means for comparing a modulation of said received signals with said transmitted modulation.
Claim 32
Dependent Claim
133 words
A submerged reflector identification system comprising in combination: means for transmitting signals at a plurality of frequencies into a medium having a reflector therein for reflecting energy of said signals, said medium having a nonlinear characteristic for converting said signals into at least one other signal having a frequency derived from a combination of frequencies of said plurality of frequencies, said transmitting means having a common radiating aperture for radiation of said signals at said plurality of frequencies; means for receiving signals at said derived frequency reflected from said reflector; means connecting with said transmitting means for providing a modulation of said derived frequency for identification of said reflector; and means coupled to said receiving means and to said modulation means for comparing a modulation of said received signals with said transmitted modulation.
Claim 33
Dependent Claim
22 words
The combination of claim 23 further comprising means connecting with said receiving means for displaying said received signals at said derived frequency.
Claim 34
Dependent Claim
26 words
The combination of claim 24 wherein said receiving means comprises means for comparing a replica of said modulation with said received signals at said derived frequency.
Claim 35
Dependent Claim
117 words
In combination: means for transmitting energy at a first frequency and at a second frequency into a medium which converts said energy into a first signal at a frequency equal to the difference of said first frequency and said second frequency; means for providing a second signal at said difference frequency; means for storing said first signal in a first recirculating delay means; means for storing said second signal in a second recirculating delay means such that said stored second signal precesses relative to said stored first signal; and means responsive to said stored first signal and said stored second signal for providing the time of arrival of said first signal at said first signal storage means.
Claim 36
Dependent Claim
117 words
In combination: means for transmitting energy at a first frequency and at a second frequency into a medium which converts said energy into a first signal at a frequency equal to the difference of said first frequency and said second frequency; means for providing a second signal at said difference frequency; means for storing said first signal in a first recirculating delay means; means for storing said second signal in a second recirculating delay means such that said stored second signal precesses relative to said stored first signal; and means responsive to said stored first signal and said stored second signal for providing the time of arrival of said first signal at said first signal storage means.
References Cited (Backward Citations)
US3510833A
Cited
US3613069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |