Patent US4218754A successfully refreshed from Google Patents.
Patent US3842418A successfully refreshed from Google Patents.
US3842418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar cross-section measurement apparatus
Assignee: Individual
•
Filing: 1973-02-08
•
Granted: 1974-10-15
•
Expires: 1993-02-08
Abstract
Abstract A radar cross-section measurement apparatus for measuring reflections from a designated target while rejecting spurious reflections and direct coupling from the transmitter in which first and second frequency or phase related continuous wave signals are fed into a hybrid junction with an output coupled to a phase comparison means such as a phase detector or a first detector of a receiver for cancelling undesired phase signals as seen by a narrow band receiver and allowing only the desired signal received by the target to pass into the receiver.
Inventors
- 👤 H Lorber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:45
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/41; G01S7/411
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
Apparatus for measuring the radar cross-section of a target at a predetermined range comprising: a first unmodulated continuous wave signal generating means at a first frequency; a second unmodulated continuous wave signal generating means at a second frequency separated from said first frequency by a predetermined amount; a mixing means having first and second inputs, said first frequency generating means coupled to said first input and said second frequency generating means coupled to said second input; a first output from said mixing means coupled to an antenna in operable proximity to a target to be measured; receiving means in operable proximity to said target to be measured; a comparison means having a first and second input and an output, said receiving means coupled to said first input and a second output from said mixing means coupled to said comparison means second input; and a readout means coupled to an output of said comparison means whereby upon adjusting the phase of said second output from said mixing means undesired signals from said receiving means are reduced at the output of said comparison means.
Claim 2
Dependent Claim
182 words
Apparatus for measuring the radar cross-section of a target at a predetermined range comprising: a first unmodulated continuous wave signal generating means at a first frequency; a second unmodulated continuous wave signal generating means at a second frequency separated from said first frequency by a predetermined amount; a mixing means having first and second inputs, said first frequency generating means coupled to said first input and said second frequency generating means coupled to said second input; a first output from said mixing means coupled to an antenna in operable proximity to a target to be measured; receiving means in operable proximity to said target to be measured; a comparison means having a first and second input and an output, said receiving means coupled to said first input and a second output from said mixing means coupled to said comparison means second input; and a readout means coupled to an output of said comparison means whereby upon adjusting the phase of said second output from said mixing means undesired signals from said receiving means are reduced at the output of said comparison means.
Claim 3
Dependent Claim
91 words
The apparatus of claim 1 wherein: said second signal generating means includes mixing means having first and second inputs coupled to said first and second signal generators and an output; a phase detector having first and second inputs and an output, said first input coupled to said mixer output; a third signal generator tuned to the difference frequency of the first and second signal generators coupled to said second input of said phase detector; and said output of said phase detector coupled for frequency control to said second signal generating means.
Claim 4
Dependent Claim
67 words
The apparatus of claim 2 and further including: a single-sideband modulator having first and second inputs and an output, said second output from said mixing means coupled to first input of said single-sideband modulator; a fourth signal generator tuned to a fourth frequency coupled to a second input of said single-sideband modulator, said output of said single-sideband modulator coupled to said second input of said comparison means.
Claim 5
Dependent Claim
101 words
The apparatus of claim 1 wherein said comparison means comprises: first and second phase detectors, each having a first and second input and an output; said comparison means first input consisting of said first and second phase detector''s first inputs coupled together and said comparison means second input consisting of said first and second phase detector''s second input coupled together and said comparison means output consisting of said first and second phase detectOr''s outputs; first and second squaring means coupled to said first and second phase detector outputs; and combining means combining the outputs of said first and second squaring means.
References Cited (Backward Citations)
US3045233A
Cited
US2965896A
Cited
US3197773A
Cited
US3168735A
Cited
US3680085A
Cited
US3719946A
Cited
US3719945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |