Back to results
US 4,204,165 AGranted
Multichannel coherent receiver
AssigneeTypoligics, Inc.
InventorPatrick J. Ready
Life of this patent
Estimating the term…
Abstract
A multichannel coherent receiver employing multiple delay lines in series or a tapped delay line into which a received signal band is introduced. The signal band at each tap or increment of delay is mixed with individual related frequencies and the product from the mixers summed and further mixed with the output of a swept oscillator. The composite delayed signal band is introduced into a bank of dispersive filters followed by means for deriving in-phase and quadrature components. Signals contained within the signal band may then be detected resulting in coherent channelization, improved frequency resolution and full time coverage sampling.
Claims21
A radio receiver comprising an input circuit for receiving a radio signal;
- a local oscillator;
- means for mixing a radio signal at said input circuit with at least one local oscillator frequency to produce a convenient intermediate frequency product of said radio signal and said local oscillator frequency;
- a variable frequency oscillator generator having a predetermined scan rate;
- a delay line including a plurality of taps;
- means for introducing the intermediate frequency product of said mixing means into said tapped delay line;
- a respective oscillator for each of said taps, each of said oscillators having a frequency which is a function of (k-n)RT where K-1 is the number of taps, R is the scan rate of the variable frequency oscillator generator, T is a constant and n is the number of a particular tap;
- means for mixing the output of each of said taps with the output of its respective oscillator to provide a plurality of outputs;
- means for combining the plurality of outputs to produce frequency multiplexed delayed products;
- means for mixing the output of said variable frequency oscillation generator with the output of said combining means;
- a filter having a variable delay-frequency characteristic matched to the time variation rate of said variable frequency oscillation generator coupled to the output of said last mixing means and having a maximum delay value T;
- and
- means connected to the output of said filter for utilizing the signal whereon;
- whereby said receiver develops a Fourier transformation of input signals with amplitude and phase information preserved.
10 more elements
A signal analyzer comprising:
- a variable frequency oscillation generator having a predetermined scan rate;
- a delay line including a plurality of taps;
- means for introducing a signal to be analyzed into said tapped delay line;
- a respective oscillator for each of said taps, each of said oscillators having a frequency which is a function of (k-n)RT K-1 is the number of taps, R is the scan rate of the variable frequency oscillation generator, T is a constant and n is the number of a particular tap;
- means for mixing the output of each of said taps with the output of its respective oscillator to provide a plurality of outputs;
- means for combining the outputs of said mixing means to produce frequency multiplexed delayed products;
- means for mixing the output of said variable frequency oscillation generator with the output of said combining means;
- a filter having a variable delay-frequency characteristic matched to the time variation rate of said variable frequency oscillation generator coupled to the output of said last mixing means and having a maximum delay value T;
- and
- means connected to the output of said filter for utilizing the signal whereon;
- whereby said receiver develops a Fourier transformation of input signals with amplitude and phase information preserved and one hundred percent input signal coverage.
8 more elements
A signal receiver comprising an input circuit for receiving a radio signal;
- means for mixing a radio signal at said input circuit with at least one frequency to produce at least one intermediate frequency product of said radio signal and said frequency;
- a delay line including a plurality of taps;
- means for introducing said intermediate frequency product into said tapped delay line;
- a variable frequency oscillation generator having a predetermined scan rate;
- a plurality of frequency sources having a frequency relationship of RT.sub.1 2RT ------(K-1) RT where K-1 equals the number of taps of said tapped delay line, R is the scan rate of the variable frequency oscillation generator, T is a constant;
- means for combining the output of the taps of said delay line with the output of respective frequency sources to produce frequency multiplexed delay products;
- means for mixing the output of said variable frequency oscillation generator with the output of said combining means;
- a filter having a delay which varies directly as a function of frequency of said last mixing means;
- and
- means for deriving quadrature components of the output of said filter.
7 more elements
A signal receiver comprising an input circuit for receiving a radio signal;
- first means for mixing a radio signal a said input circuit with at least one frequency to produce at least one intermediate frequency product of said radio signal and said frequency;
- a sweeping frequency oscillator;
- a delay line including a plurality of taps;
- means for introducing said product into said tapped delay line;
- a plurality of frequency sources having a frequency relationship with respect to each other of RT, 2RT------(K-1) RT;
- second means for mixing the output of the taps of said delay line with the output of respective frequency sources to produce a plurality of outputs
- means for combining the plurality of outputs to produce frequency multiplexed delay products;
- third of said sweeping frequency oscillator with the output of said combining means;
- a bank of dispersive filters, each of said bank of filters having a center frequency which is a function of the frequency of a respective one of said frequency sources as transformed by said sweeping oscillator and said third mixing means and having a bandwidth of at least RTHz;
- said bank of dispersive filters coupled to the output of said third mixing means;
- wherein K-1 equals the number of taps of said tapped delay line, R is the scan rate of the sweeping frequency oscillator, T is the maximum delay of said filters;
- and
- means for deriving the in phase and quadrature components of the output of said filter.
10 more elements
A signal receiver comprising:
- means for receiving a signal;
- a first local oscillator;
- a mixer coupled to said signal receiving means and said first local oscillator to produce a first intermediate frequency representation of the signal received;
- a sweeping frequency local oscillator;
- a tapped delay line;
- means for introducing said intermediate frequency representation of the signal into said tapped delay line;
- means for mixing the signal at each of said taps with the output of said sweeping frequency local oscillator to produce a plurality of variable delayed representations of said signal;
- a plurality of dispersive delay lines, each having a frequency-delay characteristic corresponding to the sweep rate of said sweeping frequency local oscillator;
- means introducing said plurality of variable delayed representations of said signal into respective dispersive delay lines;
- a plurality of second local oscillators each having a frequency a function (K-n) where K-1 is the number of taps, n is the number of a particular tap, R is the scan rate of the sweeping frequency local oscillator and T is a maximum delay of said dispersive delay lines;
- a plurality of mixers for respectively combining
- the output of said second local oscillators with the output of respective dispersive delay lines;
- and
- means for adding the output of said mixers.
11 more elements
A signal analyzer comprising:
- means for receiving a signal to be analyzed;
- a sweeping frequency oscillator;
- a tapped delay line;
- means for introducing said signal to be analyzed into said tapped delay line;
- means for mixing the signal at each of said taps with the output of said sweeping frequency oscillator to produce a plurality of variable delayed representations of said signal;
- a plurality of dispersive delay lines, each having a frequency-delay characteristic corresponding to the sweep rate of said sweeping frequency oscillator;
- means introducing said plurality of variable delayed representations of said signal into respective dispersive delay lines;
- a plurality of second oscillators each having a frequency a function F=(K-n) where K-1 is the number of taps, n is the number of a particular tap, R is the scan rate of the sweeping frequency local oscillator and T is maximum delay of said dispersive delay lines;
- a plurality of mixers for respectively combining
- the output of said second oscillators with the output of respective dispersive delay lines;
- and
- means for adding the output of said mixers.
9 more elements
Dependencies are inferred from the claim text.