Field tests of laser ranging using PRBS modulation techniques
2011
We have developed and tested an optical ranging system using a Pseudo-Random Bit Stream (PRBS) modulation
technique. The optical transceiver consisted of an infrared laser transmitter co-aligned with a receiver telescope. The
infrared laser beam was propagated to a retro-reflector and then received by a detector coupled to the telescope. The
transceiver itself was mounted on a gimbal that could actively track moving targets through a camera that was bore
sighted with the optical detector. The detected optical signal was processed in real time to produce a range measurement
with sub mm accuracy. This system was tested in the field using both stationary and moving targets up to 5 km away.
Ranging measurements to an aircraft were compared with results obtained by differential GPS (Global Positioning
System) techniques.
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