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Luoyang, China

Pi C.,Fudan University | Xu Y.,Fudan University | Zhou W.,Fudan University | Wang X.,63883 Troops | Li W.,Fudan University
Guti Dianzixue Yanjiu Yu Jinzhan/Research and Progress of Solid State Electronics

Based on analyzing the reported current-sensing circuit of high-load Buck DC-DC converter, this paper describes a novel current-sensing circuit, which mainly includes a resistor-capacitor network and switched-capacitor integrator. The resistor-capacitor network is used to eliminate the influence of the parasitic resistor of the inductor, and the switched-capacitor integrator is adopted to realize the current sensing of Buck DC-DC converter. The proposed current-sensing circuit of Buck DC-DC converter has been designed and fabricated in Chartered 0.35 μm CMOS process and the measured results show that the circuit presented in this paper can realize current-sensing of Buck DC-DC converter exactly. Source

Sun Z.,63883 Troops | Du J.,63883 Troops | Wang Z.,63883 Troops
Journal of Geomatics

Aimed at the problem of low velocity precision in follow-up data processing of GPS precision identification system now, which could not meet the demand of testing task, we designed central smoothing method for speed computing by orthogonal polynomials optimal linear filtering of white noise, which combined equally spaced and high sampling rate GPS data in the task, making use of location differential for velocity computing and based on the basic principle of GPS velocity measuring. This method enhanced velocity precision to reach O. Olmeter per second, improving velocity measuring performance indicators of GPS precision identification system. Source

Song X.,63883 Troops | Ma G.,63883 Troops | Jia Z.,63883 Troops | Shi X.,63883 Troops | Sun Z.,63883 Troops
Journal of Geomatics

We study how to improve the accuracy of airborne GPS kinematic positioning and velocity now. We use the measured data to carry on comparison and analysis of the post-processing, and discusse the relationship of single base difference and muti-base stations difference. We analyze the impact of the base station's network to muti-base station differential. Source

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