Zheng Jun

• Baotou Teachers' College

With the application field expanding of the data relay satellite in modern space technology, manned spacecraft will install the relay terminal and realize the high speed data transmission from spacecraft to control center by use of data relay satellites system. However, there are many factors such as the spacecraft regular orbit maneuver, astronaut...

This paper analyzes the relationships between orbit variations and MW rotation rates variations during station-keeping control and brings up a new evaluation algorithm of station-keeping control results by using variation of angular momentum. This algorithm can evaluate the control results rapidly and get precise semi-major axis, eccentricity, long...

In the present paper, we investigate the behavior of two-dimensional atom localization in a five-level M-scheme atomic system driven by two orthogonal standing-wave fields. We find that the precision and resolution of the atom localization depends on the probe field detuning significantly. And because of the effect of the microwave field, an atom c...

We investigate the behavior of two-dimensional atom localization in an inverted-Y system driven by one coherent field and two standing-wave fields. The position probability distribution of the atom passing through the spatial-position-dependent standing-wave fields can be determined by measuring the spontaneously emitted photon. It is found that hi...

We investigate the dispersive and absorptive properties of an N-type four-level atomic system in three coherent fields, and consider the susceptibility mathematically. It is shown that the group velocity of the probe field exhibits sub- and super-luminal under some conditions, meanwhile the absorption coefficient keeps zero during the occurrence an...

In the research of digital vector control system of permanent magnet synchronous machine (PMSM), double loop control system was chosen, in which a PID controller was adopted in the speed and the current loop. Some problems such as overshoot, long response time and the small range of speed regulating appear. To deal with these problems, this paper d...