•The
HawkEye system works with a 200Hz laser.
•The
laserbeam is transmitted through a mirror system to the scanning mirror which
sends the pulses down to the watersurface.
•The laserpulse contains of 80%IR
and 20%green light. The IR component of the pulse is reflected in the
watersurface back to the helicopter. The green light penetrates the
watervolume and is reflected at the bottom.
•There are three detectors for the
returning pulses, one for the IR and two for the green light. The reflected
pulses are digitized and the time between the IR and the green pulse is
measured. With that time the depth can be determined.
•The
scannermirror has encoders witch gives very accurate angles for the beam.
These angels are used to calculate the position of the lasershots relative to
the helicopter. In order to stabilize the mirror for helicopter motions the is
an IRS system connected to the mirror.
•The helicopter it self is
positioned with DGPS. We have two possibilities to get differential
corrections. One is through our IALA standard radiobeacons and our other
possibility is through the national EPOS service. The EPOS service is
transmitted on the FM band.