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US 4,903,029 AGranted
Delayed replica radar test set target
AssigneeHughes Aircraft Company
InventorsIrwin L. Newberg, Adrian E. Popa
Life of this patent
Estimating the term…
Abstract
A radar test set target which is co-located with the radar and produces a faithful replica of the radar signal substantially delayed in time. The radar signal modulates a laser light which is controllable delayed in time by transmitting the modulated laser light through a fiber optic delay line. The output of the delay line is demodulated and the extracted and delayed radar signal is returned to the radar as a test signal.
Claims37
A radar test set for producing a delayed replica of an R. F. radar signal comprising:
- a. light means for generating a light;
- b. modulation means connected to the radar signal and to said light means for modulating the light generated by said light means in accordance with the radar signal;
- c. delay means connected to said modulation means for delaying the modulated light, said delay means including a fiber optic cable have two ends, one end of which is connected to the modulated light;
- and
- d. demodulator means connected to the other end of said fiber optic cable for extracting from the modulated light the delayed radar signal.
2 more elements
A radar test set for producing a delayed replica of an R.F. radar signal comprising:
- a. a laser diode for emitting laser light:
- b. modulation means connected to the radar signal for modulating the intensity of the laser light produced by said laser diode in accordance with the radar signal;
- c. a fiber optic cable having two ends, one end of which is coupled to the modulated laser light;
- and
- d. an optical detector connected to the other end of said fiber optic cable for extracting from the modulated laser light the delayed radar signal.
2 more elements
A radar test set for producing a delayed replica of an R.F. radar signal comprising:
- a. light means for generating a laser light;
- b. modulation means connected to the radar signal and to said light means for modulating the laser light generated by said light means in accordance with the radar signal;
- c. a fiber optic cable having two ends, one end of which is connected to the modulated laser light, said fiber optic cable having a diameter which is matched to the frequency of the laser light, being of a single mode type, and being coiled with no portion of said coil making an arc having a radius less than one inch;
- and
- d. demodulator means connected to the other end of said fiber optic cable for extracting from the modulated laser light the delayed radar signal.
2 more elements
A radar test set for producing a delayed replica of a radar signal comprising:
- a. light means for generating a light wherein said light means emits laser light and wherein said light means further includes a laser diode;
- b. modulation means connected to the radar signal and to said light means for modulating the light generated by said light means in accordance with the radar signal, wherein said modulation means includes a bias-tee network connected to said diode;
- c. delay means connected to said modulation means for delaying the modulated light, said delay means including a fiber optic cable have two ends, one end of which is connected to the modulated light;
- and
- d. demodulator means connected to the other end of said fiber optic cable for extraction from the modulated light the delayed radar signal.
2 more elements
A radar test set for producing a delayed replica of a radar signal comprising:
- a. light means for generating light;
- b. modulation means connected to the radar signal and to said light means for modulating the light generated by said light means in accordance with the radar signal;
- c. delay means connected to said modulation means for delaying the modulated light, said delay means including a fiber optic cable have two ends, one end of which is connected to the modulated light;
- and
- d. demodulator means connected to the other end of said fiber optic cable for extracting from the modulated light the delayed radar signal wherein said demodulator means includes an optical detector, and wherein said demodulator means further includes a bias-tee network connected to said optical detector.
2 more elements
A radar test set for producing a delayed replica of a radar signal comprising:
- a. light means for generating a light, wherein said light means generates a light of substantially constant intensity;
- b. modulation means connected to the radar signal and to said light means for modulating the light generated by said light means in accordance with the radar signal, wherein said modulation means includes a device which modulates the laser light using a pair of electrodes and wherein a potential is applied to said electrodes having a magnitude substantially proportional to the radar signal;
- c. delay means connected to said modulation means for delaying the modulated light, said delay means including a fiber optic cable have two ends, one end of which is connected to the modulated light;
- and
- d. demodulator means connected to the other end of said fiber optic cable for extracting from the modulated light the delayed radar signal.
2 more elements
A radar test set for producing a delayed replica of a radar signal comprising:
- a. light means for generating a light;
- modulation means connected to the radar signal and to said light means for modulating the light generated by said light means in accordance with the radar signal;
- c. delay means connected to said modulation means for delaying the modulated light, said delay means including a fiber optic cable have two ends, one end of which is connected to the modulated light;
- d. demodulator means connected to the other end of said fiber optic cable for extracting from t he modulated light the delayed radar signal;
- e. attenuator means connected to said demodulator means for altering the amplitude of the delayed radar signal;
- and
- f. control electronics connected to said attenuator means for controlling the amount of said amplitude alteration.
4 more elements
A radar test set for producing a delayed replica of a radar signal comprising:
- a. light means for generating a light;
- b. modulation means connected to the radar signal and to said light means for modulating the light generated by said light means in accordance with the radar signal;
- c. delay means connected to said modulation means for delaying the modulated light, said delay means including a fiber optic cable have two ends, one end of which is connected to the modulated light;
- d. demodulator means connected to the other end of said fiber optic cable for extracting from the modulated light the delayed radar signal;
- e. switch means connected to said demodulator means for blocking the passage of a portion of the signal coming from said demodulator means;
- f. control electronics connected to said switch means for controlling which of said portion is blocked;
- and
- g. second detector means connected to said control electronics and to the radar signal for providing said control electronics with a synchronizing signal.
5 more elements
Dependencies are inferred from the claim text.