Patent US3787866A successfully refreshed from Google Patents.
US3787866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doppler antenna calibration apparatus
Assignee: Singer Co
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Filing: 1972-12-15
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Granted: 1974-01-22
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Expires: 1992-12-15
Abstract
Abstract Apparatus which permits near-field calibration of a doppler antenna in the laboratory avoiding the high costs and uncertainties of flight calibration is shown. The antenna and an associated transmitter are mounted over and very close to a scattering surface and means provided to effect relative motion between the antenna and the surface. In one embodiment the scattering surface is on an endless belt which is driven under the antenna and, in another, the antenna is placed on an arm and rotated over an annular trough containing granular material.
Inventors
- 👤 G Gamertsfelder
- 👤 G Stavis
- 👤 L Vladimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:25
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
Apparatus to provide movement of a doppler antenna over a surface to obtain outputs useful in calibration of the antenna comprising: a. a reflecting surface containing random scattering means; b. means to mount the antenna to be tested and its associated transmitter-receiver a small distance above said surface; c. means to effect relative motion between said surface and said antenna; and d. means providing an output indicative of one of the speed and distance traveled of said surface with respect to said antenna.
Claim 2
Dependent Claim
83 words
Apparatus to provide movement of a doppler antenna over a surface to obtain outputs useful in calibration of the antenna comprising: a. a reflecting surface containing random scattering means; b. means to mount the antenna to be tested and its associated transmitter-receiver a small distance above said surface; c. means to effect relative motion between said surface and said antenna; and d. means providing an output indicative of one of the speed and distance traveled of said surface with respect to said antenna.
Claim 3
Dependent Claim
62 words
The invention according to claim 1 wherein said surface comprises an endless belt supported between two cylindrical rollers having mounted thereon a multiplicity of flexible reflectors, said reflectors mounted so that they are free to reorient themselves as said belt moves and said means to effect relative motion of said belt comprise means to rotate at least one of said cylindrical rollers.
Claim 4
Dependent Claim
13 words
The invention according to claim 3 wherein said reflectors are lengths of chain.
Claim 5
Dependent Claim
13 words
The invention according to claim 3 wherein said reflectors are lengths of tinsel.
Claim 6
Dependent Claim
17 words
The invention according to claim 3 wherein said means to drive said rollers comprises an electric motor.
Claim 7
Dependent Claim
67 words
The invention according to claim 1 wherein said surface comprises an annular trough containing a layer of granular reflecting material, said means to mount said antenna comprises a horizontal crossmember affixed to a rotable vertical member such that rotation will cause said antenna to pass over and annular trough in a circular path, and said means to effect relative motion comprise means to rotate said vertical member.
Claim 8
Dependent Claim
39 words
The invention according to claim 6 and further including a rake secured to the end of said crossmember opposite said antenna extending into said layer of granular material whereby said granular material will be rearranged as said crossmember rotates.
Claim 9
Dependent Claim
23 words
The invention according to claim 7 wherein said means to rotate said vertical member comprises an electrical motor coupled to said vertical member.
Claim 10
Dependent Claim
12 words
The invention according to claim 9 wherein said granular material is gravel.
Claim 11
Dependent Claim
19 words
The invention according to claim 1 wherein said output means comprise a shaft encoder coupled to said moving means.
References Cited (Backward Citations)
US2602924A
Cited
US3388604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |