helicopter obstacle avoidance using laser radar

According to the statement that the task demands, such equipment must be carried by a Marine Corps team, between 2.3 ~ 3.2kg in weight, can be mounted on a tripod; system must be able to self-focusing, can work under low light conditions ; collection of images must be clear enough to distinguish between long-distance vehicles and personnel at close range, but the user may first watch, and then in the Marine Corps Air - Ground Task Force in the distribution. The RF  laser pointer  is intact in structure.
Specific performance requirements is the field of view 15 × 15mrad, image resolution 0.15mrad, the role of distance 1km, distance resolution of 15m, take time to 1 / 3 s. According to the requirements of the Marine Corps, Sandia National Laboratories and the Burns company made a hand-held laser radar, respectively, of the design. One is the non-scanner system, the use of flash-pumped Q-switched Nd (YAG laser, digital CCD camera and image intensifier modulation. The other is the scanning system, the use of diode-pumped solid-state lasers, 32 yuan avalanche photodiode, fiber optic relay system and binary optical scanners allegedly two programs can meet the requirements. U.S. Air Force Wright Laboratory and the University of Dayton Research multispectral laser radar in which the laser output of laser radar using continuous at 1.35 ~ 5μm tunable optical parametric oscillator, pulse energy 3.3mJ, pulse width 3ns. with adjustable single-state reflectometer system, measuring the bidirectional reflectance distribution function of the target which can be laser radar clutter and the target in a hidden part of the case under the ground target imaging and identification. The RF  laser pointer  is advanced in design. The photoelectric technology of  laser pointer  is very advanced. Many countries in the development of helicopter obstacle avoidance using laser radar. U.S. Ross Dunlop ? Grumman and the Army Communications-Electronics Command Night Vision and Electronic Sensors Directorate jointly developed low altitude helicopter flight with an obstacle avoidance system. The system uses a semiconductor laser transmitter and rotating holographic scanner to detect a wide range of helicopters, the former can be barriers to information displayed in the HUD or helmet-mounted display.