Modulated digital radio frequency memory

Details Modulated digital radio frequency memory Modulated digital radio frequency memory

1986-10-17

1987-12-15

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

455 91, G01S 738

Patent

active

047136626

ABSTRACT:
A digital radio frequency memory (DRFM) system for storing and retrieving radio frequency signals in a digital memory. The system includes a digital memory, digital converters at the input and output of the digital memory, and input and output mixers. The RF signal to be stored is applied to the input mixer along with a modulated local oscillator signal to produce an IF signal which is converted into digital values for storage in the digital memory. When the stored digital values are retrieved from the memory to reproduce the RF signal, they are converted back into an analog IF signal which passes through a low-pass filter before being applied to the output mixer. The local oscillator signal, modulated with the same waveform used in storing the digital values, is also applied to the output mixer to provide the reconstructed RF signal. A pseudo random, discrete digital valued waveform is used to phase modulate the local oscillator signal in the preferred embodiment of the invention. This arrangement permits spur free, image free reproduction of RF signals over a large bandwidth.

REFERENCES:
patent: 3947827 (1976-03-01), Dautremont, Jr. et al.
patent: 3991409 (1976-11-01), Dautremont, Jr. et al.
patent: 4011561 (1977-03-01), Dounce
patent: 4021804 (1977-05-01), Dounce et al.
patent: 4095224 (1978-06-01), Dounce et al.
patent: 4450447 (1984-05-01), Zebker et al.

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