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Optical signal to be disturbed, currently used by adaptive optics technology can better solve the problem, you can ensure that in then the channel conditions. Vibration suppression technology. 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. Active control is the external energy input of the controlled system, and system energy cancel each other out to achieve vibration suppression. This kind of 300mw red laser has the short and small appearance.
Include: bandwidth adjustment, adjust the detector array, adjust the beam width, power control, using the diversity of inter-satellite link focus on specific methods. Satellite laser communication technology advantages and difficulties. The advantages of satellite laser communication. Satellite laser communication is a transmission medium, the laser optical communications link between the satellite and than to achieve data transmission technology. Satellite laser communication systems and microwave communications system has the following advantages: large channel capacity. Laser frequency 3-4 orders of magnitude higher than the microwave, as the carrier of the communication means the greater of available band optical communication channel data rates of up to 20Gb / s or more, and can be applied to WDM technology communication capacity increased several times, as technology advances there will be increased significantly. It is the pulse function application of Laser Pointers.
Very small divergence angle of the laser energy is highly concentrated, high power density falls on the receiver on the telescope antenna, thereby transmitting power of the transmitter can significantly reduce the communication transmitter power is relatively low for satellite communications such power The occasion of valuable resources is very applicable. transmitter low transmit power and power consumption makes the weight of the transmitter and its power supply system to be decreased; because the wave length of the laser divergence angle in the same transmit beam and receiver field of view requirements , the caliber of transmitting and receiving telescope can be smaller. laser communication to get rid of a huge dish antenna of microwave systems, weight and size can alleviate a lot of very favorable for satellite communications. It is the pulse design of 300mw red laser.
The high degree of confidentiality. The laser has a high degree of directional transmit beam thin and able to transfer large amounts of data in a short period of time, thereby reducing the continued communication time. Satellite laser communication with a high degree of confidentiality and anti-jamming, and can effectively prevent eavesdropping and detection have a greater significance for military and civilian. typical satellite laser communication system, the beam divergence angle 10rad satellite laser communication difficulty. Inter-satellite laser communication with the above advantages, too, the technical difficulties of inter-satellite optical communication and its unique features: satellite optical link in space aimed at capturing and tracking the launch of the satellite laser communication beam is very narrow , which bring its many advantages. 300mw red laser will be turned on very rapidly and quickly.
But at the same time launching beam narrow and technically caused enormous difficulties. Mutual high-speed movement between the two satellites is very far away, and by the vibration of the satellite itself can cause the emission beam jitter, this case will launch the communication beam accurately target irradiation and lock on the receiving end satellite is very difficult. Therefore, the interaction between two communication terminals target capture, targeting, tracking (Acquisition, Pointing, Tracking referred to as the APT) technology is quite complex, and this is resulting in satellite optical one of the reasons for the slow communication development. existence of the background light. these background light comes mainly from the radiation of the sun, moon, Venus, Earth and other planets, reflection, the radiation of the background light intensity, spectral distribution, the receiver into the angle. And the laser beam light coming out of the aperture at the front of 300mw red laser will go out.