Some technical problem of led flash light should be analyzed

In 1996 and 1997 returns were launched laser altimetry satellite SLA-01 and SLA-02, for observation of surface vegetation and other natural features. Later, contains a "laser altimeter to study the system" (GLAS) "ice satellite" (ICESat) on January 13, 2003 launch. Its mission is to monitor glaciers, observing the clouds in the vertical distribution of suspended particulate density and optical density, and measure the distribution of vegetation and ground terrain. In 1996 the United States' near-Earth asteroid rendezvous detector "(NEAR) was launched in 2000, successfully entered orbit of the asteroid Eros for a period of one year of close asteroid observation program. The quality of green laser pointer cannot be ensured with the technical problem unsolved.
Laser range finder as part of its load of one of five sets of precision observation system. For the observation of calculating the volume of the size of Eros and understanding of its density. NEAR laser rangefinder system consists of five main parts: the delay of the laser emission with optical and laser power supply, optical receiving part, with detector and processor, analog circuit, digital processing circuitry and low voltage power supply. This is the world's first laser range finder into the asteroid's orbit, the asteroid in orbit around one year work has been ongoing work. Chang E One of China's recently launched a major lunar exploration satellite payload - Lunar Orbiter Laser Altimeter is the first set of lasers in space applications.  green laser pointer should be maintained well in the daily use.
By laser altimeter combined with the CCD stereo camera, you can get three-dimensional images of the lunar surface and terrain height data. Chang-e laser altimeter on the boot more than two months, has been with the stars around the moon turned over 720 laps, almost twice the moon covers (including the poles). It is almost every second month on the surface-emitting laser beam and receives the reflected light, making the interval of more than ten kilometers on the moon can "have" a point, and the resolution is accurate to 5 meters. Current "laser footprint" of the density reached 0.87 points per square kilometer, send and receive between 99% success rate of collection. Satellite formation flying space technology at home and abroad in recent years one of the issues focus of the study. Some technical problem of led flash light should be analyzed.
The aim is to use multiple small satellites constellation formation flying to achieve the traditional single large satellites do not have the power. With the micro-spacecraft technology continues to evolve, from a few or even more than a few low-cost micro-spacecraft constellation consisting of formation widespread attention. At the same time it can achieve the same goal-dimensional detection, and can provide a large aperture and long baseline measurement, in communications, remote sensing, navigation, electronic surveillance, three-dimensional imaging, precise positioning and atmospheric, astronomical and geophysical observations and other fields have very significance. Inter-satellite real-time, high-precision measurement is independent of distance formation flying satellite formation keeping, collaborative control is an important guarantee. The daily use of green laser pointer is always emphasized.
Good use of laser coherence and strong directional characteristics that can be achieved through high-precision laser phase measurement between the star and the laser interferometer to achieve through a relatively fixed distance from the changes between the two satellite measurements. The United States and Japan have a lot in this area of research and experiment. By ESA and NASA jointly implemented, is expected to launch in 2011 about plans for the LISA space exploration gravity waves generated by the binary system, the energy of the black hole has a strong research to verify Einstein's general theory of relativity, as well as probing the early universe, and so on. LISA mission consists of three spacecraft components. They run in the sun-centered orbit, each spacecraft relative distance of 500 kilometers.  green laser pointer will effectively block various signals.