Research on multi-source coherent laser interference mechanism of cluster photoelectric imaging sensors

Research on detection method of airborne obstacle avoidance lidar

“…When the number of points in the cuboid is less than the threshold value, the point is filtered out. The calculation of body diathesis is shown in formula (1). Given a non-empty voxel V containing m points, the centroid Pcen(xcen, ycen, zcen) of the voxel is (1)…”

“…Laser radar has the technical advantages of high angular resolution and range resolution, high speed resolution, wide speed measurement range, high peak power, wide wavelength range, fast frequency, anti-interference and small size, and strong detection ability for power lines, and is widely used in helicopter low-altitude flight detection and obstacle avoidance. [1] Since the laser came out in 1960, because of its high operating frequency, good monochromism and coherence and high concentration of energy as radar radiation source, it has been widely concerned by radar and military circles. In 1970, the National Aeronautics and Space Administration of the United States successfully developed the world's first ground-toground LiDAR system by combining the position data of the global positioning System and the attitude data of the inertial navigation system [1] .…”

“…[1] Since the laser came out in 1960, because of its high operating frequency, good monochromism and coherence and high concentration of energy as radar radiation source, it has been widely concerned by radar and military circles. In 1970, the National Aeronautics and Space Administration of the United States successfully developed the world's first ground-toground LiDAR system by combining the position data of the global positioning System and the attitude data of the inertial navigation system [1] . The laser radar uses the laser pulse emitted by the high-repetition laser to carry out laser ranging, and combines the large-range scanning system to scan and measure the area in a certain field of view in front of the aircraft, so as to obtain the distance/orientation of obstacles in the target area and the three-dimensional geometric structure information, which can provide a basis for the obstacle avoidance/path planning of the aircraft.…”