Patent US4089001A successfully refreshed from Google Patents.
US4089001A
Expired / Lapsed
US
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Radar MTI system using a noncoherent transmitter
Assignee: International Telephone and Telegraph Corp
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Filing: 1977-05-06
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Granted: 1978-05-09
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Expires: 1997-05-06
Abstract
Abstract A coherence reference signal device, and utilizing radar system therefor, in which a coherent reference signal is provided for phase detection of target echo signals for subsequent application to a canceller or other signal processor. The device recognizes the phase conditions throughout a given transmitted pulse (range bin) and provides this same phase information repetitively for each of n range bins of interest. A tapped sonic delay line of metallic glass material with input and output transducers and a summer circuit provide the coherent reference signal produced to a phase detector which also receives the echo signals, preferably both in the IF frequency domain.
Inventors
- 👤 Thomas H. Donahue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:23
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/288
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
A device for producing bipolar, phase compared MIT signals in a noncoherent MTI system which includes a pulsed RF transmitter and an echo signal receiver providing IF output signals comprising: first means for deriving an IF pulse signal having instantaneous phase values continuously representative of the radio frequency phase over the duration of each transmitted RF pulse; second means comprising a sonic delay line having an input and n taps spaced τ, where τ is substantially the duration of said transmitter pulses, and an electric-to-sonic signal transducer responsive to said first means output for driving the input of said delay line with a corresponding sonic pulse; third means including a sonic-to-electric signal transducer connected to convert the sonic signal at each of said taps to a corresponding electric signal, and a summer circuit responsive to said electric signals to produce an IF phase reference signal nτ in duration at the ouput of said summer; and fourth means including a phase detector circuit for phase comparing said echo receiver output signals against said IF phase reference signal to produce said bipolar signals.
Claim 2
Independent Claim
181 words
A device for producing bipolar, phase compared MIT signals in a noncoherent MTI system which includes a pulsed RF transmitter and an echo signal receiver providing IF output signals comprising: first means for deriving an IF pulse signal having instantaneous phase values continuously representative of the radio frequency phase over the duration of each transmitted RF pulse; second means comprising a sonic delay line having an input and n taps spaced τ, where τ is substantially the duration of said transmitter pulses, and an electric-to-sonic signal transducer responsive to said first means output for driving the input of said delay line with a corresponding sonic pulse; third means including a sonic-to-electric signal transducer connected to convert the sonic signal at each of said taps to a corresponding electric signal, and a summer circuit responsive to said electric signals to produce an IF phase reference signal nτ in duration at the ouput of said summer; and fourth means including a phase detector circuit for phase comparing said echo receiver output signals against said IF phase reference signal to produce said bipolar signals.
Claim 3
Dependent Claim
17 words
Apparatus according to claim 1 in which said electric-to-sonic and said sonic-to-electric signal transducers are piezoelectric devices.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 1 in which said sonic delay line comprises a metallic glass sonic conductor.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 3 in which said metallic glass sonic conductor is further defined as a filament of metallic glass of a composition selected from a group including Pd-Si-Ag glasses.
Claim 6
Dependent Claim
36 words
Apparatus according to claim 3 in which said sonic conductor forming said delay line is a filamentary member having a composition selected from a group of Pd-Si-Ag glasses including Pd 80 Si 16 AG 4 .
Claim 7
Dependent Claim
21 words
Apparatus according to claim 1 in which said electric-to-sonic transducer is a magneto-strictive device and said sonic-to-electric transducers are piezoelectric devices.
Claim 8
Dependent Claim
25 words
Apparatus according to claim 3 in which said sonic conductor is a filamentary member composed of Pd 80 Si 16 Ag 4 metallic glass material.
References Cited (Backward Citations)
US4015260A
Cited
US4021804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |