Patent US3573824A successfully refreshed from Google Patents.
US3573824A
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Wind shear and turbulence radar indicator
Assignee: United States Department of the Air Force
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Filing: 1969-04-21
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Granted: 1971-04-06
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Expires: 1989-04-21
Abstract
Abstract A wind shear and turbulence radar indicator in which velocity information is obtained from a coherent memory filter and presented rapidly and conveniently on an intensity modulated PPI scope as the doppler radar antenna rotates in azimuth. Regions of wind shear and turbulence can be identified immediately by a characteristic signature on this display.
Inventors
- 👤 Graham M Armstrong
- 👤 Ralph J Donaldson Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/585; G01S13/52; G01S13/522; G01S13/524; G01S13/88; G01S13/95; G01S13/951; Y; Y02; Y02A; Y02A90/00; Y02A90/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A pulse Doppler radar visual indicator of tangential shear and turbulence providing a characteristic signature comprising a pulsed Doppler radar having an antenna continuously scanning, said antenna directing pulses toward weather conditions of interest, a Doppler receiver receiving return weather echoes from said conditions of interest, a coherent memory filter receiving Doppler information from said Doppler radar receiver, said Doppler information containing velocity and range information, a plan velocity indicator receiving the output from said coherent memory filter for visual display on the face of said plan velocity indicator, said plan velocity indicator also receiving positional information from said antenna, said visual display being a pattern of concentric arcs, each arc being located at its appropriate range plus an incremental displacement dependent on the radial component of velocity measured at that range with radial shear indicated by gaps and bunching with tangential shear indicated by wrinkles in the arcs, an increase in line widths of the arcs marking regions of spectral broadening.
Claim 2
Dependent Claim
162 words
A pulse Doppler radar visual indicator of tangential shear and turbulence providing a characteristic signature comprising a pulsed Doppler radar having an antenna continuously scanning, said antenna directing pulses toward weather conditions of interest, a Doppler receiver receiving return weather echoes from said conditions of interest, a coherent memory filter receiving Doppler information from said Doppler radar receiver, said Doppler information containing velocity and range information, a plan velocity indicator receiving the output from said coherent memory filter for visual display on the face of said plan velocity indicator, said plan velocity indicator also receiving positional information from said antenna, said visual display being a pattern of concentric arcs, each arc being located at its appropriate range plus an incremental displacement dependent on the radial component of velocity measured at that range with radial shear indicated by gaps and bunching with tangential shear indicated by wrinkles in the arcs, an increase in line widths of the arcs marking regions of spectral broadening.
Claim 3
Dependent Claim
96 words
A pulse Doppler radar visual indicator as in claim 1 wherein said coherent memory filter is comprised of a summing network receiving the output of said radar receiver, a preselected delay connected to the output of said summing network, an oscillator generating a signal of predetermined frequency, a mixer simultaneously receiving the outputs of said delay and said oscillator, the resultant output of said mixer being received by said summing network, and an envelope detector receiving the output from said summing network to provide range and velocity information for intensity modulation of said plan velocity indicator.
References Cited (Backward Citations)
US3193825A
Cited
US3212085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |