US3938148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control system
Assignee: United States Department of the Navy
•
Filing: 1974-07-10
•
Granted: 1976-02-10
•
Expires: 1994-07-10
Abstract
Abstract An automatic frequency control system that is particularly suited for use th an aircraft launched radar controlled guided missile. The missile automatic frequency control system is made entirely of solid state devices including a voltage tuned solid state oscillator. The system employs a search mode of operation and two lock modes of operation. The search mode of operation occurs prior to missile launch when the aircraft radar and the missile control system are both scanning for a target and the reflected signal from the target has not been received by the missile control system. The two lock modes of operation are false lock and real lock. False lock occurs when the missile receives a false signal from the doppler radar of a nearby aircraft, for example. Real lock occurs during missile free flight when the missile receives a reflected radar signal from the target.
Inventors
- 👤 Charles A. Hobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:56
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/22; F41G7/226; F41G7/2266; F41G7/007; F41G7/2273; F41G7/2286; G; G01; G01S; G01S13/00; G01S13/02; G01S13/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
An automatic frequency control system comprising: a. first means for receiving reflected radar signals from a target; b. second means for receiving radar signals directly from a radar transmitter means; c. a voltage tuned solid state oscillator the output of which is connected to said first and second means; d. third means responsive to the output of said second means for applying a first control voltage to said solid state oscillator; e. fourth means responsive to the output of said first means for applying a second control voltage to said solid state oscillator; f. fifth means responsive to the output of said second means; and g. sixth means responsive to the output of said fifth means for modifying the output of said third means.
Claim 2
Dependent Claim
124 words
An automatic frequency control system comprising: a. first means for receiving reflected radar signals from a target; b. second means for receiving radar signals directly from a radar transmitter means; c. a voltage tuned solid state oscillator the output of which is connected to said first and second means; d. third means responsive to the output of said second means for applying a first control voltage to said solid state oscillator; e. fourth means responsive to the output of said first means for applying a second control voltage to said solid state oscillator; f. fifth means responsive to the output of said second means; and g. sixth means responsive to the output of said fifth means for modifying the output of said third means.
Claim 3
Dependent Claim
28 words
The automatic frequency control system of claim 1 including: a. seventh means responsive to said sixth means for applying a third control voltage to said solid state oscillator.
Claim 4
Dependent Claim
30 words
The automatic frequency control system of claim 2 including: a. a low pass filter connected to the output of said fifth means and to the input of said fourth means.
Claim 5
Dependent Claim
30 words
The automatic frequency control system of claim 3 wherein: a. said first means includes a front antenna, a front mixer, a front IF amplifier and a comparator connected in series.
Claim 6
Dependent Claim
30 words
The automatic frequency control system of claim 4 wherein: a. said second means includes a rear antenna, a rear mixer, a rear IF amplifier and a discriminator connected in series.
Claim 7
Dependent Claim
25 words
The automatic frequency control systems of claim 5 wherein: a. the output of said rear IF amplifier is connected to an input of said comparator.
Claim 8
Dependent Claim
25 words
The automatic frequency control device of claim 6 wherein: a. said third means includes a low pass filter and a bootstrap amplifier connected in series.
Claim 9
Dependent Claim
51 words
The automatic frequency control system of claim 7 wherein: a. said fourth means includes a speed gate doppler receiver the outputs of which are respectively connected to the inputs of a recycle device and a launch relay the outputs of which are connected to the inputs of a coherency check device.
Claim 10
Dependent Claim
27 words
The automatic frequency control system of claim 8 wherein: a. said fifth means includes an amplifier, a band pass filter and an amplitude detector connected in series.
Claim 11
Dependent Claim
24 words
The automatic frequency control system of claim 9 wherein: a. said sixth means includes a DC amplifier and a sweep generator connected in series.
References Cited (Backward Citations)
US3212083A
Cited
US3394371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |