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Various ions in the atmosphere in the atmosphere (gas molecules, mist, etc.) volume size and the semiconductor laser wavelength, and easily lead to absorption and scattering, the optical signal to be disturbed, currently used by adaptive optics technology can better resolve the problem, you can ensure its working properly then the channel conditions. Vibration Suppression of vibration suppression is an important issue for the troubled satellite optical communication, capture from the open-loop and closed-loop tracking to all aspects of optical communication, have become an important factor affecting system performance. The first to propose suppression measures are mainly concentrated in the structure, the structure of the passive control and active control to suppress vibration. Passive control of vibration energy consumption by optimizing the structure design, relying on the damping of the structure itself. These are the enterprise operation activities of laser pointer .
At present, it is the most representative system is the LITE (Laser Intersatellite Transmission Experiment), the U.S. Air Force from 1985, the Ministry of start LITE project. Massachusetts Institute of Technology Lincoln Laboratory study of high bit rate data transmission, high sensitivity inspection; ThermoTrex to study the tracking and targeting technology, including the background radiation of the sun and other high inhibitory effect of atomic filter. The goal of this study is between GEO and LEO satellite laser communication between the high-altitude aircraft and ground, the transmission rate of 220Mbps. Astro Terra is also the funding of the Air Force under a laser communications technology research, system load in 1988 it developed the launch of STRV-2 satellite. The purchase of laser pointer should be performed strictly.
By the international legal protection for Ku-band frequency band satellite single transponder power is typically much larger, Ku multi-shaped beam coverage, the key technologies of the larger satellite EIRP 9 data relay satellite - laser communication. S-band S-band frequency range 1.55-3.4GHz electromagnetic spectrum. Main applications: the relay satellite communications, radar, and so on. The now widespread use of Bluetooth, Zigbee, wireless router, wireless mouse also use this frequency range the frequency of transmission. TDRSS of technical systems 2.4.1 spectrum allocation ITU detailed proposal for each band satellite communications applications. Our choice of the following:? 6/4GHz band: up 5.925 ~ 6.425GHz, downstream 3.7 ~ to 4.2GHz.
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