Communications: directive radio wave systems and devices (e.g. – Radar ew
Reexamination Certificate
2000-04-04
2001-09-18
Sotomayor, John B. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Radar ew
C342S192000, C342S194000, C342S196000
Reexamination Certificate
active
06292128
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the field of radio frequency signal reception apparatus of the type useful in monitoring a plurality of electronic warfare-dedicated radio frequency signal sources and to the low energy embodiments of such reception apparatus.
The conventional digital electronic warfare radio receiver can be divided into the three functional portions represented in
FIG. 1
of the drawings. The first of these portions at,
100
in
FIG. 1
, is an analog-to-digital converter (ADC) used to digitize the input microwave frequency signals received on the path
104
. The second receiver portion at
102
in
FIG. 1
performs a frequency analysis, for example a fast Fourier transform (FFT) operation, by which the frequency domain characteristics of the analog-to-digital converter
100
output signals are determined—thereby enabling consideration and analysis of the input signal spectra. The third receiver functional portion at
104
in
FIG. 1
comprises encoding logic, which uses the output of the fast Fourier transform operation at
102
to identify the input signal frequencies. In the
FIG. 1
electronic warfare receiver it is notable that the analog-to-digital converter
102
and fast Fourier transform apparatus perform continuous processing of the receiver input signals from path
104
. Because of this continuous processing, particularly in the fast Fourier transform operation, conventional electronic warfare receivers are frequently difficult to use in energy limited environments.
SUMMARY OF THE INVENTION
The present invention provides a low energy consumption electronic warfare signal radio receiver combining the benefits of simple signal presence detection with low energy requirements additional signal processing.
It is an object of the present invention therefore to provide a low energy consumption electronic warfare signal radio receiver combining the benefits of time domain signal detection with signal processing accomplished by on-demand operating clockless logic electrical circuitry.
It is an object of the present invention therefore to provide a low energy consumption electronic warfare radio receiver.
It is another object of the invention to provide a electronic warfare radio receiver combining the benefits of time domain signal detection with clockless logic electrical circuitry.
It is another object of the invention to provide an electronic warfare radio receiver affording improved signal time of arrival resolution capability.
It is another object of the invention to provide an electronic warfare radio receiver affording improved time and frequency resolutions.
It is another object of the invention to provide an electronic warfare radio receiver arrangement in which selected portions of the receiver are also usable in a communications radio receiver.
It is another object of the invention to provide an electronic warfare radio receiver arrangement in which sample skipping algorithms are used in several portions of the receiver.
It is another object of the invention to provide an electronic warfare radio receiver in which time domain signal presence detection is employed.
It is another object of the invention to provide an electronic warfare radio receiver in which the combination of time domain signal detection and clockless logic fast Fourier transformation processing are utilized to advantages such as receiver power requirements.
It is another object of the invention to provide an electronic warfare radio receiver in which a simple I and Q signal included form of time domain signal detection is employed.
Additional objects and features of the invention will be understood from the following description and claims and the accompanying drawings.
These and other objects of the invention are achieved by low energy consumption time domain signal detection and clockless logic digital electronic warfare radar signal radio receiver apparatus comprising the combination of:
time domain signal detection signal presence sensing electrical circuit apparatus, including a received signal conveying channel portion therein, connected to a received signal input port of said electronic warfare radar signal radio receiver apparatus and generating a receiver control output signal in response to presence of a received radar signal in said received signal conveying channel portion therein;
clockless logic, electrical energy dissipating, received signal processing electrical circuit apparatus connected with said received signal conveying channel portion of said time domain signal detection signal presence sensing electrical circuit apparatus and enabled by an active state of said receiver control output signal of said time domain signal detection signal presence sensing electrical circuit apparatus;
said time domain signal detection signal presence sensing electrical circuit apparatus further including:
a ninety degree hybrid circuit having In phase and Quadrature phase output signals of said radar signal radio frequency;
a local oscillator-inclusive radio frequency signal mixer circuit having lower intermediate radio frequency In phase and Quadrature phase output signals in response to input of said In phase and Quadrature phase output signals of said ninety degree hybrid circuit;
first and second analog to digital converter circuits receiving said intermediate radio frequency In phase and Quadrature phase signals and generating In phase and Quadrature phase digital output signals, output signals also comprising said received signal conveying channel portion signals;
first and second signal data squaring circuits connected with said channel portion In phase and Quadrature phase digital output signals of said first and second analog to digital converter circuits and generating data squared versions of said In phase and Quadrature phase digital output signals;
an In phase and Quadrature phase digital output signal summation circuit connected with output signals of said first and second signal data squaring circuits;
a selected threshold circuit connected with an output port of said signal summation circuit and with a source of selected amplitude threshold reference signal and generating said receiver control output signal;
said clockless logic electrical energy dissipating received signal processing electrical circuit apparatus further including:
a clockless logic fast Fourier transform generating electrical circuit having an input port connected with said received signal conveying channel portion signals and enabled by said receiver control output signal; and
a clockless logic fast Fourier transform signal encoding circuit connected with said fast Fourier transform generating electrical circuit and generating a received signal coded output signal of said electronic warfare radar signal radio receiver apparatus.
REFERENCES:
patent: 5678219 (1997-10-01), Agarwal et al.
patent: 5999561 (1999-12-01), Naden et al.
patent: 6002363 (1999-12-01), Krasner
patent: 6028886 (2000-02-01), Koga et al.
patent: 6043771 (2000-03-01), Clark et al.
patent: 6085077 (2000-07-01), Fields et al.
Potts Marvin N.
Tsui James B. Y.
Hollins Gerald B.
Kundert Thomas L.
Sotomayor John B.
The United States of America as represented by the Secretary of
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