Patent ID: 8508723

Claim:
A velocimeter comprising: a radiation source configured to produce a coherent radiation beam; a modulating system comprising: a plurality of modulators, wherein each of the plurality of modulators is configured to modulate the coherent radiation beam; and a plurality of optical isolators, wherein each of the plurality of isolators is configured to provide unidirectional propagation of light in an optical fiber; a plurality of transceiver modules comprising a plurality of transceivers, wherein each of the plurality of transceivers is configured to: receive the modulated beam from the source; transmit the modulated beam to a target region; and receive a reflected signal from the target region; a plurality of optical mixing systems, wherein each of the plurality of optical mixing systems comprises: a plurality of optical mixers coupled to the plurality of transceivers, wherein each of the plurality of optical mixers is configured to: receive a reference signal from the source and the reflected signal from the corresponding transceiver; and determine a Doppler shift based on the reference signal from the source and the reflected signal from the corresponding transceiver.