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The traditional metering device has some problems in system reliability, electricity-stealing prevention and accuracy. In order to solve the above problems, a new type of three-phase high-voltage energy meter based on RN8302 is designed in this paper. In order to collect voltage signal, we design voltage divider circuit. It uses low-power current sensor to collect current signals. The whole measurement...
Based on the generalized Huygens–Fresnel principle, a far-field propagation model of a truncated Gaussian beam through Kolmogorov atmospheric turbulence is proposed. Two parameters, the far-field focal peak intensity and the corresponding mean power density, are used to characterize the energy of the laser beam's long-distance transmission. Furthermore, an optimal truncation of the launch window to...
A numerical simulation and an experiment on adaptive optics (AO) in 2.5Gbps laser communication system are introduced in this paper. The simulation results show that the signal fading is mitigated at a large part with AO correction. The experiment results show that the average bit-error-rate (BER) is 6×10−3 without AO correction. The average BER will be reduced to 1×10−4 with AO tip-tilt correction...
Airborne electro-optical stable platform can isolate movement and vibration of the airframe, stabilizes the optic axis of the photoelectic detector, realize the observation and tracking for the object. It has comprehensive application value in army and cicil field. Most of present airborne platforms are analogic control system, digital control system can improve the system general performance, digital...
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