The invention relates to a system and a method using a dual optical receiver (CCD1 and CCD2) and an on line mathematical algorithm applied to an infrasonic speckle-tracking telesensor. In the measurement s with the infrasonic telesensor, said invention allows eliminating and/ or reducing the vibrational noise present on two CCD s due to the vibration of the instrument it self and the disturbances caused by the air turbulence, in order to improve the accuracy of the measured rotational magnitude.

For such a purpose, the two optical devices are arranged so that the CCD2 receives the vibrational signal of the target with the vibrational noise from the stand and the air fluctuations; the CCD1 is arranged to receive only the noise. The algorithm of speckle pattern acquisition and simultaneous mathematical processing of the two signals by the two receivers effectively eliminates/reduces noise. The signal processing mainly occurs through spatial correlation processes on the frames acquired by the two CCDs placed at the end of two independent optical configurations linked by some common parameters. It operates as a common-mode noise rejection system.