Patent ID: 6320651
Filing Date: 2001-11-20
Classification: G01P,G01S

Abstract:
A method for measuring velocity based on the Doppler shift, said method comprising the following steps:(a) emitting a laser signal (SS) toward a target,(b) receiving a backscattered or reflected signal (ES) from said target,(c) passing said backscattered or reflected signal through a polarization dispersive element (PD) for producing a change in a polarization state of said backscattered or reflected signal,(d) passing said backscattered or reflected signal through a polarization analyzer (for providing two partial beams representing an intensity shift that signifies said change in said polarization state,(e) converting (at D.sub.1 and D.sub.2) said two partial beams into respective intensity representing electrical signals (I.sub.1 and I.sub.2), and(f) processing said electrical signals (I.sub.1 and I.sub.2) in a computer for obtaining information regarding said velocity.