US3750164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine radar with t-v receiver display
Assignee: Individual
•
Filing: 1971-07-20
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Granted: 1973-07-31
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Expires: 1991-07-20
Abstract
Abstract A marine radar system for small boats, the system making use of a conventional T-V receiver for the display of the radar picture. The radar system includes an antenna adapted to periodically scan a predetermined azimuthal sector with a beam of radar pulses whose repetition rate corresponds to the horizontal line scanning rate of the receiver, and means to generate a local carrier whose frequency corresponds to that of an unoccupied channel of the receiver. Echo signals produced by targets lying within the sector are intercepted by the antenna. These echo signals together with horizontal sync signals corresponding in frequency to the repetition rate of the radar pulses, and vertical sync signals corresponding to the antenna scanning rate are applied as modulation components on the local carrier to create a composite video signal simulating a T-V signal. The composite video signal is fed to the T-V receiver to provide a presentation on the cathode-ray tube thereof, whereby the triangular sector scanned by the radar is converted into a rectangular picture in which targets close to the radar site are expanded relative to those remote therefrom.
Inventors
- 👤 T Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:23
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/10; G01S7/12; G01S7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
248 words
A radar system employing a standard multi-channel television receiver having a cathode-ray tube and means to effect electron beam scanning at a predetermined line frequency and at a predetermined vertical frequency, said reciver having at least one unused channel, said system including: A. a radar antenna adapted to scan a predetermined azimuthal sector having a generally triangular configuration at a cyclical rate corresponding to said vertical frequency, B. means to supply microwave pulses to said antenna at a repetition rate corresponding to said line scanning frequency or to a submultiple thereof to produce a radar beam for scanning said sector, C. means coupled to said antenna to derive therefrom echo signals representing reflecting targets intercepting said radar beam, D. a picture generator including means to produce a local carrier whose frequency corresponds to said unused channel, means to produce horizontal sync pulses corresponding to said repetition rate, means to produce vertical sync pulses corresponding to said cyclical rate and means to combine said horizontal and vertical sync pulses with said echo signals and said local carrier carrier to produce a composite video signal simulating a television signal, and E. means to apply said composite video signal to said receiver to produce on the screen thereof, a rectangular radar picture in which images of targets lying within said sector having a triangular configuration, which are adjacent the radar antenna that is represented at the apex of the sector, are expanded in the rectangular picture relative to those remote therefrom.
Claim 2
Dependent Claim
248 words
A radar system employing a standard multi-channel television receiver having a cathode-ray tube and means to effect electron beam scanning at a predetermined line frequency and at a predetermined vertical frequency, said reciver having at least one unused channel, said system including: A. a radar antenna adapted to scan a predetermined azimuthal sector having a generally triangular configuration at a cyclical rate corresponding to said vertical frequency, B. means to supply microwave pulses to said antenna at a repetition rate corresponding to said line scanning frequency or to a submultiple thereof to produce a radar beam for scanning said sector, C. means coupled to said antenna to derive therefrom echo signals representing reflecting targets intercepting said radar beam, D. a picture generator including means to produce a local carrier whose frequency corresponds to said unused channel, means to produce horizontal sync pulses corresponding to said repetition rate, means to produce vertical sync pulses corresponding to said cyclical rate and means to combine said horizontal and vertical sync pulses with said echo signals and said local carrier carrier to produce a composite video signal simulating a television signal, and E. means to apply said composite video signal to said receiver to produce on the screen thereof, a rectangular radar picture in which images of targets lying within said sector having a triangular configuration, which are adjacent the radar antenna that is represented at the apex of the sector, are expanded in the rectangular picture relative to those remote therefrom.
Claim 3
Dependent Claim
18 words
A system as set forth in claim 1, wherein said line scanning frequency is 15,750 lines per second.
Claim 4
Dependent Claim
42 words
A system as set forth in claim 1, wherein said radar antenna is constituted by a stationary reflector and rotating horn cluster operating in conjunction with a switch to render the horn in the cluster successively active with respect to said reflector.
Claim 5
Dependent Claim
15 words
A system as set forth in claim 1, wherein said azimuthal sector is about 40*.
Claim 6
Dependent Claim
37 words
A system as set forth in claim 1, wherein said means to supply said pulses is constituted by a magnetron generator operating in conjunction with a modulator serving to activate said generator at the specified repetition rate.
Claim 7
Dependent Claim
27 words
A system as set forth in claim 1, further including means to shift the position of said antenna in azimuth to adjust the direction of said sector.
Claim 8
Dependent Claim
58 words
A system as set forth in claim 1, wherein said means to derive said echo pulses includes a local oscillator, means to beat reflective signals picked up by said antenna with the output of said local oscillator to produce an intermediate frequency signal, and means to amplify and detect said intermediate frequency signal to produce said echo signals.
Claim 9
Dependent Claim
36 words
A system as set forth in claim 1, wherein said picture generator includes a multi-frequency carrier oscillator and selector means to adjust said oscillator frequency to correspond to that of any channel in said television receiver.
References Cited (Backward Citations)
US3016530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |