TY - JOUR
AU - Karning, Heinrich
AB - A C02-Heterodyne Laser Radar-System for detection of wires and obstacles encountered by helicopters flying at low altitudes is being developed. The main requirement is to detect wires of 3 mm diameter at distances greater than 3oo m under good weather condition and 5o m at low visibility. The sensor field of view is 600 azimuth by 300 elevation with a frame rate of 5 Hz. A scanner configuration using counter- rotating pairs of optical wedges for azimuth and elevation scanning in conjunction with a fast scanning micro scanner allows a good spatial coverage of the field of view. A Q-switched CO2 waveguide laser delivering a 2oo ms pulse at a pulse repetition frequency of approximately loo kHz provides a relatively large number of returns from thin wires per scan. Range measurement is determined by the time of flight of the emitted laser pulse. Together with the corresponding scanner position the range data is processed to give a rough three-dimensional representation of the scenario.
TI - Heterodyne lidar for wire detection and obstacle warning
JF - Proceedings of SPIE
DO - 10.1117/12.20552
DA - 1990-10-01
UR - https://www.deepdyve.com/lp/spie/heterodyne-lidar-for-wire-detection-and-obstacle-warning-rho1037mB9
SP - 270
EP - 275
VL - 1276
IS - 1
DP - DeepDyve
ER -