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Zhang Y.,Nanjing Institute of Technology | Zhao H.,Nanjing Institute of Technology | Liu Q.,Tai Yuan Satellite Launch Center
2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011 | Year: 2011

Electromagnetic spectrum monitoring sensor networks (ESMSNs) have become a new distributed solution for the electromagnetic spectrum monitoring and attracted a large scholars' attention due to its better detection performance. However, the detection performance of ESMSNs will decrease rapidly when the faults occur to the monitoring sensor nodes, which result from the node device itself and the harsh or hostile environment where they are deployed. The distributed Bayesian algorithm was proposed to correct some errors resulted from the sensor faults. But new errors were introduced while correcting errors. Therefore, it is necessary to do some further research on the distributed fault-tolerant detection for ESMSNs. We propose an improved distributed Bayesian algorithm for fault-tolerant detection in ESMSNs and investigate the performance of detecting and correcting such faults. Analysis and Simulation results show the proposed algorithm can perform better than the distributed Bayesian algorithm and the proposed algorithm can still obtain higher reduction in the average number of errors when the probability of the monitoring sensor node fault is high. © 2011 IEEE. Source


Liu Z.-W.,Tai Yuan Satellite Launch Center | Liu F.-T.,Tai Yuan Satellite Launch Center | Gan Y.-Y.,Tai Yuan Satellite Launch Center | Cheng X.-H.,China Research Institute of Radiowave Propagation
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2011

Based on the study of atmospheric refractivity profile(RP)retrieved by microwave radiometer(MR), and compared with the radiosonde measurement data, the result indicates that the RP retrieved by MR could reflect the distribution of refractivity at the radar stations. By applying the two RP to calculate the radiowave refraction error of radar measurement data, the residual error shows that it is effective to apply the RP retrieved by MR to the radiowave refraction error correction of radar. It provides the theoretical and experimental basis for applying MR to high-precision maneuvering radar and improving the data processing precision. Copyright © 2011 by Editorial Department of Chinese Journal of Radio Science. Source


Xie C.,Tai Yuan Satellite Launch Center | Cui J.,Tai Yuan Satellite Launch Center | Liang Y.,Tai Yuan Satellite Launch Center
Optik | Year: 2015

We present a method to online testing aspherical mirror using phase retrieval with stitching. The principle of online testing is shown. The mechanism to online testing is designed and we demonstrate the kinematic analysis of this mechanism. The mathematical model of stitching method in phase retrieval is established. In simulations we prove the correctness and the validity of this method. © 2015 Elsevier GmbH. All rights reserved. Source

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