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Wenjing C.,First Engineers Scientific Research Institute | Ma D.,National University of Defense Technology
2013 8th International ICST Conference on Communications and Networking in China, CHINACOM 2013 - Proceedings | Year: 2013

In this paper, we develop a novel relay selection scheme for amplify-and-forward relay network with distributed space time coding. Using the criterion of maximizing the received signal-to-noise ratio (SNR), the multiple relay selection problem is presented. The optimal solution of this problem can be obtained by exhaustive search, which has computational complexity growing with the number of relays and leads to a centralized implementation. To circumvent this problem, an opportunistic relaying scheme is introduced and the associated selection function is derived, which is based on the approximate of the received SNR. This selection function can be computed based on the local channel information and, hence can be implemented in decentralized strategy. Simulation results show that the proposed scheme outperforms the existing opportunistic schemes. Moreover, the BER performance of the proposed scheme approaches to that of the optimal scheme with a considerably lower complexity. © 2013 IEEE. Source


Sun J.-Q.,Shanghai JiaoTong University | Sun J.-Q.,First Engineers Scientific Research Institute | Wang D.-Y.,Shanghai JiaoTong University | Sun Y.-G.,Shanghai JiaoTong University | And 2 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2015

Unlike other ocean structures, the Very Large Floating Structures(VLFS) would have large deformation under waves because of the enormous size. Hydroelasticity theory has been developed to study the response of VLFS. To increase the computational efficiency, a multi-segment beam model is proposed here to study a VLFS, which is a multi-module connected by hinge connectors. The response characteristics were studied in this paper, including the effects of wave length, wave frequency and connector's stiffness. It can be concluded from the results that, under long waves, rigid body motion is dominant, but elastic deformation dominates under short waves. The hudroelastic response is sensitive to the wave heading but biggest elastic deformation always happened when the projection of the length of the VLFS on wave heading direction is close to the wave length. Elastic deformation is sensitive to the stiffness of the connectors. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE). Source


Qian H.,First Engineers Scientific Research Institute | Sun P.,First Engineers Scientific Research Institute | Zhao H.,Air force Radar Academy
Advanced Materials Research | Year: 2012

Modern warfare has led the concept of remotely operated weapon station for increasing force protection while maintaining lethality. There is a need for an efficient embedded control system for certain kind of system. A design proposal of an integrated PC-architecture embedded control system for remotely operated weapon station is presented. The hardware of the system is based on the 486DX2 processor running at 100MHz with coprocessor, which is a Pentium class platform. Hardware/software co-design methods and tools have been discussed after the system configuration is decided. The software design consideration for the control system has been presented according to multi-task programming of VxWorks. © (2012) Trans Tech Publications, Switzerland. Source


Sun P.,First Engineers Scientific Research Institute | Qian H.,First Engineers Scientific Research Institute | Zhao H.,Air force Radar Academy
Proceedings - 2012 International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2012 | Year: 2012

An inertial navigation system with high anti-g capability, low power consumption, small volume and low cost is needed on certain specific tactical occasions. The gyroscope-free inertial measurement unit (GF-IMU) uses the linear accelerometers at different positions in space to calculate the angular velocity and estimate the navigation parameters. With the development of the MEMS sensors and Digital Signal Processors (DSP), a low-cost medium-precision tactical inertial measurement system can be developed. A SDRE-based filter algorithm is presented for dealing with the measurement error diverges of the linear accelerometers. A preliminary overall scheme is described, and the configuration profile of the sensors and the system equations are derived and analyzed. © 2012 IEEE. Source


Sun P.,First Engineers Scientific Research Institute
2nd International Conference on Information Engineering and Computer Science - Proceedings, ICIECS 2010 | Year: 2010

The dynamics of a small solid launch vehicle has been investigated. This launcher consists of a liquid upper stage and three fundamental solid rocket boosters aligned in series. During the ascent flight phase, lateral jets and grid fins are adopted by the flight control system to stable the attitude of the launcher. The launcher is a slender and aerodynamically unstable vehicle with sloshing tanks. A complete set of six-degrees-of-freedom dynamic models of the launcher, incorporation its rigid body, aerodynamics, gravity, sloshing, mass change, actuator, and elastic body, is developed. Dynamic analysis results of the structural modes and the bifurcation locus are calculated on the basis of the presented models. This complete set of dynamic models can further be used in flight control system design. ©2010 IEEE. Source

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