Coded data generation or conversion – Code generator or transmitter – Producing different pulse frequencies
Reexamination Certificate
1999-09-07
2002-05-28
Horabik, Michael (Department: 2735)
Coded data generation or conversion
Code generator or transmitter
Producing different pulse frequencies
C455S115200, C370S205000, C324S458000, C324S527000
Reexamination Certificate
active
06396431
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a variable frequency signal generator.
(2) Description of the Related Art
Previously, to perform injected signal measurements to verify system performances required multiple bulky pieces of expensive test equipment. This equipment often would not easily provide the pulse to pulse parameter agility with the accuracy and stability offered by the invention described herein.
SUMMARY OF THE INVENTION
The precision microwave/millimeter wave modulated signal source of the invention is a relatively low cost, compact, highly accurate and stable signal source covering the 2 to 40 Gigahertz (GHz) frequency range. The pulse width and amplitude level of the output signal can be changed on every pulse in the signal pulse train. Pulse width range is 5 nanoseconds to 1 millisecond. Pulse repetition intervals can be changed between each pulse set with usable range from 10 nanoseconds to 100 milliseconds. Interval parameters can be adjusted with 1 nanosecond resolutions with stabilities of +/−200 picoseconds. The highly accurate and versatile selection of signal parameters, along with its compact size, makes this design useful as an embedded built in test signal source. This built in signal source can be used for verification of system performance for many electronic warfare systems.
The invention outputs precision microwave/millimeter wave modulated signals to various. frequency bands. The source of radio frequency (RF) is a miniature oscillator that injects a low frequency at high power. This output is fed into a step recovery diode that generates many combed output frequencies. This spectrum is then modulated by a programmed high precision pulse repetition interval (PRI) signal coming from a circuit board containing pulse characteristics as small as 1 nanosecond (s) pulsewidth. One frequency picket at a time is filtered by a yttrium iron garnet (YIG) filter and appropriate attenuation is set by a digitally variable attenuator to yield the desired precision microwave/millimeter modulated signals.
REFERENCES:
patent: 3921085 (1975-11-01), Keane
patent: 4078255 (1978-03-01), Evans
patent: 4127819 (1978-11-01), Keane
patent: 4342008 (1982-07-01), Jewett
patent: 4425515 (1984-01-01), Larson
patent: 4613821 (1986-09-01), Sternberg et al.
patent: 5572213 (1996-11-01), Noneman et al.
patent: 5963581 (1999-10-01), Fullerton et al.
patent: 5995534 (1999-11-01), Fullerton et al.
Cho Kichul
Misra Gautam
Swanick David J.
Horabik Michael
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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