US3618093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Obstacle detection radar system
Assignee: United States Department of the Army
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Filing: 1963-03-14
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Granted: 1971-11-02
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Expires: 1983-03-14
Abstract
Abstract 4. A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected one of said feeds, a second input connected to the other of said feeds, and two outputs, a 90* shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first subtractor coupled to said first and second mixers; an adder coupled to said first and second mixers; a first IF amplifier coupled to said first subtractor; a second IF amplifier coupled to said adder; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; and a second subtractor coupled to said first and second rectifiers.
Inventors
- 👤 Frank R Dickey Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:01
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/93; G01S13/933; G01S13/935
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
A radar receiver comprising: a first antenna; a second antenna vertically displaced from said first antenna; a first mixer coupled to said first antenna; a second mixer coupled to said second antenna; a local oscillator coupled to said first and second mixers; a first IF amplifier connected to said first mixer; a second IF amplifier connected to said second mixer; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; a subtractor circuit coupled to said first and second rectifiers; a third rectifier coupled to said subtractor; and an indicator coupled so said third rectifier.
Claim 2
Dependent Claim
103 words
A radar receiver comprising: a first antenna; a second antenna vertically displaced from said first antenna; a first mixer coupled to said first antenna; a second mixer coupled to said second antenna; a local oscillator coupled to said first and second mixers; a first IF amplifier connected to said first mixer; a second IF amplifier connected to said second mixer; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; a subtractor circuit coupled to said first and second rectifiers; a third rectifier coupled to said subtractor; and an indicator coupled so said third rectifier.
Claim 3
Dependent Claim
103 words
A radar receiver comprising: a first antenna; a second antenna vertically displaced from said first antenna; a first mixer coupled to said first antenna; a second mixer coupled to said second antenna; a local oscillator coupled to said first and second mixers; a first IF amplifier connected to said first mixer; a second IF amplifier connected to said second mixer; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; a subtractor circuit coupled to said first and second rectifiers; a third rectifier coupled to said subtractor; and an indicator coupled so said third rectifier.
Claim 4
Dependent Claim
103 words
A radar receiver comprising: a first antenna; a second antenna vertically displaced from said first antenna; a first mixer coupled to said first antenna; a second mixer coupled to said second antenna; a local oscillator coupled to said first and second mixers; a first IF amplifier connected to said first mixer; a second IF amplifier connected to said second mixer; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; a subtractor circuit coupled to said first and second rectifiers; a third rectifier coupled to said subtractor; and an indicator coupled so said third rectifier.
Claim 5
Dependent Claim
120 words
A radar system comprising: a first antenna; a second antenna vertically displaced from said first antenna; an ATR switch coupled to said second antenna; a transmitter coupled to said ATR switch; a TR switch coupled to said second antenna; a first mixer coupled to said first antenna; a first IF amplifier coupled to said first mixer; a first rectifier coupled to said first IF amplifier; a second mixer coupled to said TR switch; a second IF amplifier coupled to said second mixer; a second rectifier coupled to said second IF amplifier; a local oscillator coupled to said first and second mixers; a subtractor circuit coupled to said first and second rectifiers; and a third rectifier coupled to said subtractor circuit.
Claim 6
Dependent Claim
120 words
A radar system comprising: a first antenna; a second antenna vertically displaced from said first antenna; an ATR switch coupled to said second antenna; a transmitter coupled to said ATR switch; a TR switch coupled to said second antenna; a first mixer coupled to said first antenna; a first IF amplifier coupled to said first mixer; a first rectifier coupled to said first IF amplifier; a second mixer coupled to said TR switch; a second IF amplifier coupled to said second mixer; a second rectifier coupled to said second IF amplifier; a local oscillator coupled to said first and second mixers; a subtractor circuit coupled to said first and second rectifiers; and a third rectifier coupled to said subtractor circuit.
Claim 7
Dependent Claim
124 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected to one of said feeds, a second input connected to the other of said feeds, and two outputs; a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first subtractor coupled to said first and second mixers; an adder coupled to said first and second mixers; a first rectifier coupled to said first subtractor; a second rectifier coupled to said adder; and a second subtractor coupled to said first and second rectifiers.
Claim 8
Dependent Claim
124 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected to one of said feeds, a second input connected to the other of said feeds, and two outputs; a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first subtractor coupled to said first and second mixers; an adder coupled to said first and second mixers; a first rectifier coupled to said first subtractor; a second rectifier coupled to said adder; and a second subtractor coupled to said first and second rectifiers.
Claim 9
Dependent Claim
158 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected one of said feeds, a second input connected to the other of said feeds, and two outputs, a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first subtractor coupled to said first and second mixers; an adder coupled to said first and second mixers; a first IF amplifier coupled to said first subtractor; a second IF amplifier coupled to said adder; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; a second subtractor connected to said first and second rectifiers a third rectifier connected to said second subtractor; and an indicator connected to said third rectifier.
Claim 10
Dependent Claim
158 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected one of said feeds, a second input connected to the other of said feeds, and two outputs, a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first subtractor coupled to said first and second mixers; an adder coupled to said first and second mixers; a first IF amplifier coupled to said first subtractor; a second IF amplifier coupled to said adder; a first rectifier coupled to said first IF amplifier; a second rectifier coupled to said second IF amplifier; a second subtractor connected to said first and second rectifiers a third rectifier connected to said second subtractor; and an indicator connected to said third rectifier.
Claim 11
Dependent Claim
144 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected to one of said feeds, a second input connected to the other of said feeds; and two outputs; a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first IF amplifier coupled to said first mixer; a second IF amplifier coupled to said second mixer; a first subtractor coupled to said first and second IF amplifiers; an adder coupled to said first and second IF amplifiers; a first rectifier coupled to said first subtractor; a second rectifier coupled to said adder; and a second subtractor coupled to said first and second rectifiers.
Claim 12
Dependent Claim
144 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected to one of said feeds, a second input connected to the other of said feeds; and two outputs; a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first IF amplifier coupled to said first mixer; a second IF amplifier coupled to said second mixer; a first subtractor coupled to said first and second IF amplifiers; an adder coupled to said first and second IF amplifiers; a first rectifier coupled to said first subtractor; a second rectifier coupled to said adder; and a second subtractor coupled to said first and second rectifiers.
Claim 13
Dependent Claim
159 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected to one of said feeds, a second input connected to the other of said feeds, and two outputs; a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first IF amplifier coupled to said first mixer; a second IF amplifier coupled to said second mixer; a first subtractor coupled to said first and second IF amplifiers; an adder coupled to said first and second IF amplifiers; a first rectifier coupled to said first subtractor; a second rectifier coupled to said adder; a second subtractor connected to said first and second rectifiers a third rectifier coupled to said second subtractor; and an indicator coupled to said third rectifier.
Claim 14
Dependent Claim
159 words
A radar receiver comprising: an antenna having two vertically displaced feeds; a hybrid tee having a first input connected to one of said feeds, a second input connected to the other of said feeds, and two outputs; a 90* phase shifter coupled to one of said hybrid tee outputs; a first mixer coupled to said phase shifter; a second mixer coupled to the other of said hybrid tee outputs; a local oscillator coupled to said first and second mixers; a first IF amplifier coupled to said first mixer; a second IF amplifier coupled to said second mixer; a first subtractor coupled to said first and second IF amplifiers; an adder coupled to said first and second IF amplifiers; a first rectifier coupled to said first subtractor; a second rectifier coupled to said adder; a second subtractor connected to said first and second rectifiers a third rectifier coupled to said second subtractor; and an indicator coupled to said third rectifier.
Claim 15
Dependent Claim
213 words
A radar system comprising: an antenna having two vertically displaced feeds; a hybrid tee having two inputs and two outputs; means to connect one of said antenna feeds to one of said hybrid tee inputs; means to connect the other of said antenna feeds to the other of said hybrid tee inputs; a first TR switch connected to one of said hybrid tee outputs; a second TR switch connected to the other of said hybrid tee outputs; an ATR switch connected to the other of said hybrid tee outputs; a transmitter connected to said ATR switch; a 90* phase shifter connected to said first TR switch; a first mixer connected to said phase shifter; a second mixer connected to said second TR switch; a local oscillator connected to said first and second mixers; a first subtractor connected to said first and second mixers; an adder connected to said first and second mixers; a first IF amplifier connected to said first subtractor; a second IF amplifier connected to said adder; a first rectifier connected to said first IF amplifier; a second rectifier connectEd to said second IF amplifier; a second subtractor connected to said first and second rectifiers; a third rectifier connected to said second subtractor; and an indicator connected to said third rectifier.
Claim 16
Dependent Claim
213 words
A radar system comprising: an antenna having two vertically displaced feeds; a hybrid tee having two inputs and two outputs; means to connect one of said antenna feeds to one of said hybrid tee inputs; means to connect the other of said antenna feeds to the other of said hybrid tee inputs; a first TR switch connected to one of said hybrid tee outputs; a second TR switch connected to the other of said hybrid tee outputs; an ATR switch connected to the other of said hybrid tee outputs; a transmitter connected to said ATR switch; a 90* phase shifter connected to said first TR switch; a first mixer connected to said phase shifter; a second mixer connected to said second TR switch; a local oscillator connected to said first and second mixers; a first subtractor connected to said first and second mixers; an adder connected to said first and second mixers; a first IF amplifier connected to said first subtractor; a second IF amplifier connected to said adder; a first rectifier connected to said first IF amplifier; a second rectifier connectEd to said second IF amplifier; a second subtractor connected to said first and second rectifiers; a third rectifier connected to said second subtractor; and an indicator connected to said third rectifier.
Claim 17
Dependent Claim
214 words
A radar system comprising: an antenna having two vertically displaced feeds; a hybrid tee having two inputs and two outputs; means to connect one of said antenna feeds to one of said hybrid tee inputs; means to connect the other of said antenna feeds to the other of said hybrid tee inputs; a first TR switch connected to the other of said hybrid tee outputs; a second TR switch connected to the other of said hybrid tee outputs; an ATR switch connected to the other of said hybrid tee outputs; a transmitter connected to said ATR switch; a 90* phase shifter connected to said first TR switch; a first mixer connected to said phase shifter; a second mixer connected to said second TR switch; a local oscillator connected to said first and second mixers; a first IF amplifier connected to said first mixer; a second IF amplifier connected to said second mixer; a first subtractor connected to said first and second IF amplifiers; an adder connected to said first and second IF amplifiers; a first rectifier connected to said first subtractor; a second rectifier connected to said adder; a second subtractor connected to said first and second rectifiers; a third rectifier connected to said second subtractor; and an indicator connected to said third rectifier.
Claim 18
Dependent Claim
214 words
A radar system comprising: an antenna having two vertically displaced feeds; a hybrid tee having two inputs and two outputs; means to connect one of said antenna feeds to one of said hybrid tee inputs; means to connect the other of said antenna feeds to the other of said hybrid tee inputs; a first TR switch connected to the other of said hybrid tee outputs; a second TR switch connected to the other of said hybrid tee outputs; an ATR switch connected to the other of said hybrid tee outputs; a transmitter connected to said ATR switch; a 90* phase shifter connected to said first TR switch; a first mixer connected to said phase shifter; a second mixer connected to said second TR switch; a local oscillator connected to said first and second mixers; a first IF amplifier connected to said first mixer; a second IF amplifier connected to said second mixer; a first subtractor connected to said first and second IF amplifiers; an adder connected to said first and second IF amplifiers; a first rectifier connected to said first subtractor; a second rectifier connected to said adder; a second subtractor connected to said first and second rectifiers; a third rectifier connected to said second subtractor; and an indicator connected to said third rectifier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |