An Experimental Device for Optimizing the Threshold of Space Laser Communication System Based on Atmospheric Parameters
A technology for optimizing space and atmospheric parameters, applied in free space transmission, transmission monitoring/testing/fault measurement systems, etc., can solve problems such as the inability to accurately estimate the optimal decision threshold for space laser communication
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Embodiment 1
[0037] image 3 Be an embodiment of the present invention; The used modulation signal source output signal of experimental device is TTL signal among the present embodiment; Semiconductor laser output power 100mW, output wavelength is 532nm; The transmittance of beam expander is 0.8; Cassegrain telescope The receiving aperture is 100mm, the transmittance is 0.8; the photodetector is APD silicon photodiode AD500-8, the responsivity is 50A / W, the working bandwidth is 0.1GHz, the noise figure is 2.5, the multiplication factor is 100, the preamplifier The multiple is 100; the sampling frequency of the acquisition card in the computer is 100MHz.
[0038] In this embodiment, the experimental device is calibrated before the first use. Install the transmitting terminal and the receiving terminal at a close distance indoors, adjust the transmitting antenna so that the laser can shine on the receiving antenna, and control the laser power to prevent the detector from being saturated; co...
Embodiment 2
[0045] Such as Figure 4 As shown, in this embodiment, the parts other than the computer of the transmitting terminal and receiving terminal of the experimental device are omitted, and the computer equipped with the calculation program is used as a functional module to connect to the receiving terminal of the space laser communication system to be tested. according to Figure 4 The structure connects the output voltage of the receiving terminal to the computer, and at the same time connects the calculation results output by the computer to the receiving terminal to update its decision threshold. Other operation steps and calculation process are the same as those in Embodiment 1, and the optimal threshold and bit error rate of the communication system under the current atmospheric conditions can also be estimated.
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