APPARATUS FOR CORRELATION DETECTION AND MEASUREMENT OF FREQUENCY Russian patent published in 2015 - IPC G01R23/12 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used in radar, radioprospecting, radio communication and spectral analysis. The apparatus comprises series-connected adder (1), coincidence stage (2), delay line (3), amplifier (4) and shift modulator (5). The output of the shift modulator (5) is connected to one of the inputs of the adder (1). The second input of the shift modulator (5) is connected through a narrow-band intermediate frequency amplifier (13) to the output of a second mixer (12). One of the inputs of the second mixer (12) is connected to the first input of a first mixer (9). The second input of the first mixer (9) is connected to the output of a reference generator (10). The output of the first mixer (9) is connected through a high frequency amplifier (11) to the input of the delay line (3) and through a buffer amplifier (8) to one of the inputs of a display (7). The second input of the display (7) is connected to one of the outputs of a pulse generator (6). The second output of the pulse generator (6) is connected to the second input of the coincidence stage (2). The apparatus is provided with a band-pass filter (14) and a high-pass filter (15). The output of the delay line (3) is connected through the band-pass filter (14) to the second input of the second mixer (12). The second output of the second mixer (12) is connected through the high-pass filter (15) to the second input of the adder (1).

EFFECT: high measurement accuracy.

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