Patent US4217581A successfully refreshed from Google Patents.
US4217581A
Expired / Lapsed
US
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High range resolution radar rate aided range tracker
Assignee: United States Department of the Navy
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Filing: 1978-09-22
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Granted: 1980-08-12
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Expires: 1998-09-22
Abstract
Abstract Means for enabling a high range resolution radar to maintain precise rangenformation of a high velocity maneuvering aircraft or other target during radar operation. A voltage indicative of target motion is provided as an input to a voltage controlled oscillator that develops a waveform having a frequency that varies from the frequency of a stable reference oscillator by an amount commensurate with that voltage input. The frequency differential of the two oscillators is utilized to cause the tracking window to move in proportion to the range rate of the target.
Inventors
- 👤 Michael J. Prickett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/66; G01S13/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A rate aided range tracker having a range delay trigger for a high resolution radar having a main trigger comprising: first means for sensing target motion and for converting detected target motion to a commensurate voltage output; a reference oscillator for outputting a reference frequency signal; a voltage controlled oscillator having its input connected to said first means for outputting a voltage controlled signal; second means connected to said reference oscillator for outputting a pulse train that is the main trigger signal of said radar and for input to said main trigger of said high range resolution radar; third means connected to said voltage controlled oscillator for outputting a trigger pulse train variably delayed or advanced from said second means pulse train for input to said range delay trigger; and a monostable multivibrator connected to the output of said third means.
Claim 2
Dependent Claim
141 words
A rate aided range tracker having a range delay trigger for a high resolution radar having a main trigger comprising: first means for sensing target motion and for converting detected target motion to a commensurate voltage output; a reference oscillator for outputting a reference frequency signal; a voltage controlled oscillator having its input connected to said first means for outputting a voltage controlled signal; second means connected to said reference oscillator for outputting a pulse train that is the main trigger signal of said radar and for input to said main trigger of said high range resolution radar; third means connected to said voltage controlled oscillator for outputting a trigger pulse train variably delayed or advanced from said second means pulse train for input to said range delay trigger; and a monostable multivibrator connected to the output of said third means.
Claim 3
Dependent Claim
15 words
The range tracker of claim 1 wherein said first means comprises an early/late gate network.
Claim 4
Dependent Claim
21 words
The range tracker of claim 1 wherein said first means further comprises a voltage regulator connected to said early/late gate network.
Claim 5
Dependent Claim
21 words
The range tracker of claim 1 wherein said reference oscillator and said voltage control oscillator are enclosed in one temperature oven.
Claim 6
Dependent Claim
12 words
The range tracker of claim 1 wherein said target motion is acceleration.
Claim 7
Dependent Claim
20 words
The range tracker of claim 1 wherein said second means converts said reference frequency signal to a rectangular pulse train.
Claim 8
Dependent Claim
20 words
The range tracker of claim 6 wherein said third means converts said voltage controlled signal to a rectangular pulse train.
Claim 9
Dependent Claim
27 words
The range tracker of claim 7 wherein the frequency of said voltage controlled signal deviates from said reference frequency by an amount determined by said voltage output.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |