Patent US3898658A successfully refreshed from Google Patents.
US3898658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration and velocity matching lo generator
Assignee: United States Department of the Navy
•
Filing: 1969-04-02
•
Granted: 1975-08-05
•
Expires: 1989-04-02
Abstract
Abstract An oscillator system particularly suited for use in radar signal processing. A fixed frequency spectrum, related to the radar transmitted pulse, is combined with incremental variations of frequency, related to different target velocity doppler frequencies, and with positive and negative frequency sweeps of different slopes which are representative doppler frequency variations of different target accelerations.
Inventors
- 👤 Garold K Jensen
- 👤 James E Mcgeogh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:31
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/64
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
An oscillator system particularly suited for use in a radar which transmits pulses of energy having a frequency fo at a pulse repetition frequency fPRF, comprising: Oscillator means producing an oscillator signal which is varied in frequency in a manner related to the doppler video signal in said radar for anticipated targets; Spectrum generator means producing a fixed frequency spectrum signal having frequency components related to fo and fo + or -nfPRF where n is an integer and Combining means for combining said oscillator signal and said fixed frequency spectrum signal.
Claim 2
Dependent Claim
91 words
An oscillator system particularly suited for use in a radar which transmits pulses of energy having a frequency fo at a pulse repetition frequency fPRF, comprising: Oscillator means producing an oscillator signal which is varied in frequency in a manner related to the doppler video signal in said radar for anticipated targets; Spectrum generator means producing a fixed frequency spectrum signal having frequency components related to fo and fo + or -nfPRF where n is an integer and Combining means for combining said oscillator signal and said fixed frequency spectrum signal.
Claim 3
Dependent Claim
93 words
An oscillator system particularly suited for use in a radar which transmits pulses of energy having a frequency fo at a pulse repetition frequency fPRF, comprising: Signal producing means for producing sequential signals which are varied in frequency in a manner related to the doppler video signals in said radar for differing anticipated targets; Spectrum generator means producing a fixed frequency spectrum signal having frequency components related to fo and fo + OR nfPRF where n is an integer and Combining means for combining said sequential signals and said fixed frequency spectrum signal.
Claim 4
Dependent Claim
93 words
An oscillator system particularly suited for use in a radar which transmits pulses of energy having a frequency fo at a pulse repetition frequency fPRF, comprising: Signal producing means for producing sequential signals which are varied in frequency in a manner related to the doppler video signals in said radar for differing anticipated targets; Spectrum generator means producing a fixed frequency spectrum signal having frequency components related to fo and fo + OR nfPRF where n is an integer and Combining means for combining said sequential signals and said fixed frequency spectrum signal.
Claim 5
Dependent Claim
26 words
The oscillator system of claim 2 wherein said signal producing means is an oscillator which is controlled by a ramp driver and by a step driver.
Claim 6
Dependent Claim
35 words
The oscillator system of claim 2 wherein said signal producing means includes a generator which produces a plurality of constant frequency signals and a voltage controlled oscillator which is controlled by a variable sawtooth driver.
Claim 7
Dependent Claim
179 words
In a radar which transmits pulses of energy having a frequency fo and a pulse repetition frequency fPRF and wherein the receiver doppler video signal is stored in and read out from range bins, an oscillator and signal recovery system comprising: Oscillator means producing an oscillator signal which is varied in a manner related to the doppler video signal in said radar for anticipated targets; Spectrum generator means producing a fixed frequency spectrum signal having frequency components related to fo and fo + or -nfPRF where n is an integer; First combining means for combining said oscillator signal and said fixed frequency spectrum signal and producing a first combining means output signal; Second combining means connected to said first combining means for combining said first combining means output signal and the read out from said range bins and for producing a second combining means output signal and Narrow band filter means connected to receive said second combining means and to pass only that portion of said second combining means output signal which is within a predetermined narrow frequency band.
Claim 8
Dependent Claim
179 words
In a radar which transmits pulses of energy having a frequency fo and a pulse repetition frequency fPRF and wherein the receiver doppler video signal is stored in and read out from range bins, an oscillator and signal recovery system comprising: Oscillator means producing an oscillator signal which is varied in a manner related to the doppler video signal in said radar for anticipated targets; Spectrum generator means producing a fixed frequency spectrum signal having frequency components related to fo and fo + or -nfPRF where n is an integer; First combining means for combining said oscillator signal and said fixed frequency spectrum signal and producing a first combining means output signal; Second combining means connected to said first combining means for combining said first combining means output signal and the read out from said range bins and for producing a second combining means output signal and Narrow band filter means connected to receive said second combining means and to pass only that portion of said second combining means output signal which is within a predetermined narrow frequency band.
Claim 9
Dependent Claim
36 words
The apparatus of claim 5 wherein said oscillator means includes an oscillator controlled by a ramp driver and by a step driver and wherein said range bin readout is in the form of simultaneous, parallel signals.
Claim 10
Dependent Claim
50 words
The apparatus of claim 5 wherein said oscillator means includes a generator which produces a plurality of constant frequency signals and a voltage controlled oscillator which is controlled by a variable sawtooth driver and wherein said range bin readout is in the form of sequential signals from different range bins.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |