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Ka-band with other services compete for the problem is small, can transmit up to hundreds of megabits / sec of data. 13 data relay satellite key technologies – laser communications ESA first used in the inter-orbit link 23/26GHz band (Ka band). These bands experimental platform for the 21st century, space stations and advanced earth observation imaging systems provide the required broadband link. NASA’s second-generation TDRS also use the same band. The end of 1989, Japan (NASDA) announced changes in its earlier frequency planning, the Japanese DRTS and experimental relay satellite COMETS are use 23/32GHz bands. Space network interoperability committee soon realized that the interoperability of the Ka-band to create a good start. The quality of green laser pointer should be ensured first.
Active control is the external energy input of the controlled system, and system energy cancel each other out to achieve vibration suppression. 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 based on laser transmission media, optical communication link established between the satellite data transmission technology. Satellite laser communication systems and microwave communications system has the following advantages compared: Data Relay Satellite key technologies. Laser communication. Much importance should be attached to the purchase management of green laser pointer .
Use of non-structure for you to disturbance between the longitudinal mode gain. A cleavage plane and the reflection rate is zero, seen by the diagram on both sides of the same longitudinal mode mode indices a loss. Which can appear similar to Figure asymmetric SLM. Relative to the asymmetric structure of the SLM, A / 4 phase shift method is a reliable way to get DSLM cowardly. This phase shift area through positive and negative light-induced corrosion film or electron beam lithography method in the system. Above the DFB is a diffraction grating formed on the active waveguide refractive index cycle to provide optical feedback, the so-called refractive index coupled DFB. Before have already pointed out. For the elimination of the Bragg lattice wave length while the side-longitudinal-mode power value of the gain simple and can be taken to the asymmetric structure. The operation target of the enterprise of green laser pointer can be realized.
Space laser communication system, in order to obtain a high tracking precision composite axis control, including the coarse tracking servo unit to complete capture and preliminary track and platform perturbations of low-frequency part of the suppression; fine tracking servo unit on the coarse tracking servo unit The residuals for further suppressed, so as to achieve high-precision tracking. Studies have shown that the platform perturbation is one of the main factors affecting tracking accuracy. More effective inhibition is crucial for the compound axis system as an important part of the compound-axis servo system, and how the low-frequency disturbance. In this paper, the fuzzy adaptive PID design to the spindle, automatic on-line adjustment of three parameters by fuzzy inference.  green laser pointer  is at the appropriate price.
Electrical signal is converted by the modulator drive laser for the optical signal out launch, the optical signal through the atmospheric channel, to reach the photodiode optical receiver antenna to convert optical signals into electrical signals, then signal processing (shaping, filtering, amplification ), the processed signal for PPM demodulation, during error control decoder, after decoding the binary data recorded by the serial incoming computer. Finally, record the results and send data bit by bit error rate compared statistically different data bits, the ratio between the different bits of data with the total transmit bits is required of Error measurement schematic in Figure 1. The statistical distribution of errors in a 16 slot, the basic uniform distribution. The purchase management of green laser pointer  is in the list.